mirror of
https://gitlab.gnome.org/GNOME/glib.git
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d9b30d47a6
These were introducing strict aliasing warnings. Remove them (in line with other uses of `g_once_init_leave()`). Signed-off-by: Philip Withnall <withnall@endlessm.com>
5892 lines
160 KiB
C
5892 lines
160 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* gmain.c: Main loop abstraction, timeouts, and idle functions
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* Copyright 1998 Owen Taylor
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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/*
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* MT safe
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*/
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#include "config.h"
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#include "glibconfig.h"
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#include "glib_trace.h"
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/* Uncomment the next line (and the corresponding line in gpoll.c) to
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* enable debugging printouts if the environment variable
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* G_MAIN_POLL_DEBUG is set to some value.
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*/
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/* #define G_MAIN_POLL_DEBUG */
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#ifdef _WIN32
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/* Always enable debugging printout on Windows, as it is more often
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* needed there...
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*/
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#define G_MAIN_POLL_DEBUG
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#endif
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#ifdef G_OS_UNIX
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#include "glib-unix.h"
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#include <pthread.h>
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#ifdef HAVE_EVENTFD
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#include <sys/eventfd.h>
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#endif
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#endif
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#include <signal.h>
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#include <sys/types.h>
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#include <time.h>
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#include <stdlib.h>
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif /* HAVE_SYS_TIME_H */
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#ifdef G_OS_UNIX
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#include <unistd.h>
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#endif /* G_OS_UNIX */
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#include <errno.h>
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#include <string.h>
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#ifdef G_OS_WIN32
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#define STRICT
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#include <windows.h>
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#endif /* G_OS_WIN32 */
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#ifdef HAVE_MACH_MACH_TIME_H
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#include <mach/mach_time.h>
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#endif
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#include "glib_trace.h"
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#include "gmain.h"
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#include "garray.h"
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#include "giochannel.h"
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#include "ghash.h"
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#include "ghook.h"
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#include "gqueue.h"
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#include "gstrfuncs.h"
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#include "gtestutils.h"
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#include "gthreadprivate.h"
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#ifdef G_OS_WIN32
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#include "gwin32.h"
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#endif
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#ifdef G_MAIN_POLL_DEBUG
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#include "gtimer.h"
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#endif
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#include "gwakeup.h"
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#include "gmain-internal.h"
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#include "glib-init.h"
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#include "glib-private.h"
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/**
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* SECTION:main
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* @title: The Main Event Loop
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* @short_description: manages all available sources of events
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*
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* The main event loop manages all the available sources of events for
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* GLib and GTK+ applications. These events can come from any number of
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* different types of sources such as file descriptors (plain files,
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* pipes or sockets) and timeouts. New types of event sources can also
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* be added using g_source_attach().
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*
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* To allow multiple independent sets of sources to be handled in
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* different threads, each source is associated with a #GMainContext.
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* A GMainContext can only be running in a single thread, but
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* sources can be added to it and removed from it from other threads.
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*
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* Each event source is assigned a priority. The default priority,
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* #G_PRIORITY_DEFAULT, is 0. Values less than 0 denote higher priorities.
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* Values greater than 0 denote lower priorities. Events from high priority
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* sources are always processed before events from lower priority sources.
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*
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* Idle functions can also be added, and assigned a priority. These will
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* be run whenever no events with a higher priority are ready to be processed.
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*
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* The #GMainLoop data type represents a main event loop. A GMainLoop is
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* created with g_main_loop_new(). After adding the initial event sources,
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* g_main_loop_run() is called. This continuously checks for new events from
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* each of the event sources and dispatches them. Finally, the processing of
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* an event from one of the sources leads to a call to g_main_loop_quit() to
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* exit the main loop, and g_main_loop_run() returns.
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*
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* It is possible to create new instances of #GMainLoop recursively.
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* This is often used in GTK+ applications when showing modal dialog
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* boxes. Note that event sources are associated with a particular
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* #GMainContext, and will be checked and dispatched for all main
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* loops associated with that GMainContext.
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*
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* GTK+ contains wrappers of some of these functions, e.g. gtk_main(),
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* gtk_main_quit() and gtk_events_pending().
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*
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* ## Creating new source types
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*
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* One of the unusual features of the #GMainLoop functionality
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* is that new types of event source can be created and used in
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* addition to the builtin type of event source. A new event source
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* type is used for handling GDK events. A new source type is created
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* by "deriving" from the #GSource structure. The derived type of
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* source is represented by a structure that has the #GSource structure
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* as a first element, and other elements specific to the new source
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* type. To create an instance of the new source type, call
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* g_source_new() passing in the size of the derived structure and
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* a table of functions. These #GSourceFuncs determine the behavior of
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* the new source type.
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*
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* New source types basically interact with the main context
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* in two ways. Their prepare function in #GSourceFuncs can set a timeout
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* to determine the maximum amount of time that the main loop will sleep
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* before checking the source again. In addition, or as well, the source
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* can add file descriptors to the set that the main context checks using
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* g_source_add_poll().
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*
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* ## Customizing the main loop iteration
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*
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* Single iterations of a #GMainContext can be run with
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* g_main_context_iteration(). In some cases, more detailed control
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* of exactly how the details of the main loop work is desired, for
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* instance, when integrating the #GMainLoop with an external main loop.
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* In such cases, you can call the component functions of
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* g_main_context_iteration() directly. These functions are
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* g_main_context_prepare(), g_main_context_query(),
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* g_main_context_check() and g_main_context_dispatch().
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*
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* ## State of a Main Context # {#mainloop-states}
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*
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* The operation of these functions can best be seen in terms
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* of a state diagram, as shown in this image.
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*
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* 
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*
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* On UNIX, the GLib mainloop is incompatible with fork(). Any program
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* using the mainloop must either exec() or exit() from the child
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* without returning to the mainloop.
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*
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* ## Memory management of sources # {#mainloop-memory-management}
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*
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* There are two options for memory management of the user data passed to a
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* #GSource to be passed to its callback on invocation. This data is provided
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* in calls to g_timeout_add(), g_timeout_add_full(), g_idle_add(), etc. and
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* more generally, using g_source_set_callback(). This data is typically an
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* object which ‘owns’ the timeout or idle callback, such as a widget or a
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* network protocol implementation. In many cases, it is an error for the
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* callback to be invoked after this owning object has been destroyed, as that
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* results in use of freed memory.
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*
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* The first, and preferred, option is to store the source ID returned by
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* functions such as g_timeout_add() or g_source_attach(), and explicitly
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* remove that source from the main context using g_source_remove() when the
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* owning object is finalized. This ensures that the callback can only be
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* invoked while the object is still alive.
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*
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* The second option is to hold a strong reference to the object in the
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* callback, and to release it in the callback’s #GDestroyNotify. This ensures
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* that the object is kept alive until after the source is finalized, which is
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* guaranteed to be after it is invoked for the final time. The #GDestroyNotify
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* is another callback passed to the ‘full’ variants of #GSource functions (for
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* example, g_timeout_add_full()). It is called when the source is finalized,
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* and is designed for releasing references like this.
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*
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* One important caveat of this second approach is that it will keep the object
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* alive indefinitely if the main loop is stopped before the #GSource is
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* invoked, which may be undesirable.
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*/
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/* Types */
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typedef struct _GTimeoutSource GTimeoutSource;
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typedef struct _GChildWatchSource GChildWatchSource;
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typedef struct _GUnixSignalWatchSource GUnixSignalWatchSource;
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typedef struct _GPollRec GPollRec;
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typedef struct _GSourceCallback GSourceCallback;
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typedef enum
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{
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G_SOURCE_READY = 1 << G_HOOK_FLAG_USER_SHIFT,
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G_SOURCE_CAN_RECURSE = 1 << (G_HOOK_FLAG_USER_SHIFT + 1),
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G_SOURCE_BLOCKED = 1 << (G_HOOK_FLAG_USER_SHIFT + 2)
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} GSourceFlags;
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typedef struct _GSourceList GSourceList;
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struct _GSourceList
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{
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||
GSource *head, *tail;
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gint priority;
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||
};
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typedef struct _GMainWaiter GMainWaiter;
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struct _GMainWaiter
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{
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GCond *cond;
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GMutex *mutex;
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};
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typedef struct _GMainDispatch GMainDispatch;
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struct _GMainDispatch
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||
{
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||
gint depth;
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||
GSource *source;
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||
};
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#ifdef G_MAIN_POLL_DEBUG
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gboolean _g_main_poll_debug = FALSE;
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||
#endif
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struct _GMainContext
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{
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||
/* The following lock is used for both the list of sources
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* and the list of poll records
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*/
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||
GMutex mutex;
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||
GCond cond;
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||
GThread *owner;
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||
guint owner_count;
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GSList *waiters;
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||
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volatile gint ref_count;
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GHashTable *sources; /* guint -> GSource */
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GPtrArray *pending_dispatches;
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gint timeout; /* Timeout for current iteration */
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guint next_id;
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GList *source_lists;
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gint in_check_or_prepare;
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GPollRec *poll_records;
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guint n_poll_records;
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GPollFD *cached_poll_array;
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guint cached_poll_array_size;
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|
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GWakeup *wakeup;
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||
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GPollFD wake_up_rec;
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||
|
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/* Flag indicating whether the set of fd's changed during a poll */
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gboolean poll_changed;
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GPollFunc poll_func;
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gint64 time;
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gboolean time_is_fresh;
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};
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struct _GSourceCallback
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{
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volatile gint ref_count;
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GSourceFunc func;
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gpointer data;
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GDestroyNotify notify;
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};
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struct _GMainLoop
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{
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GMainContext *context;
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gboolean is_running; /* (atomic) */
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volatile gint ref_count;
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||
};
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||
|
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struct _GTimeoutSource
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{
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GSource source;
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||
/* Measured in seconds if 'seconds' is TRUE, or milliseconds otherwise. */
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||
guint interval;
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||
gboolean seconds;
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||
};
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||
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||
struct _GChildWatchSource
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||
{
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||
GSource source;
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||
GPid pid;
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gint child_status;
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#ifdef G_OS_WIN32
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GPollFD poll;
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#else /* G_OS_WIN32 */
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gboolean child_exited; /* (atomic) */
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#endif /* G_OS_WIN32 */
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};
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struct _GUnixSignalWatchSource
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{
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GSource source;
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int signum;
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||
gboolean pending; /* (atomic) */
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||
};
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||
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||
struct _GPollRec
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||
{
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||
GPollFD *fd;
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GPollRec *prev;
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||
GPollRec *next;
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||
gint priority;
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||
};
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||
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struct _GSourcePrivate
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||
{
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||
GSList *child_sources;
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||
GSource *parent_source;
|
||
|
||
gint64 ready_time;
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||
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||
/* This is currently only used on UNIX, but we always declare it (and
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* let it remain empty on Windows) to avoid #ifdef all over the place.
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*/
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GSList *fds;
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||
};
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||
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typedef struct _GSourceIter
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{
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GMainContext *context;
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gboolean may_modify;
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GList *current_list;
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GSource *source;
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} GSourceIter;
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||
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||
#define LOCK_CONTEXT(context) g_mutex_lock (&context->mutex)
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||
#define UNLOCK_CONTEXT(context) g_mutex_unlock (&context->mutex)
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||
#define G_THREAD_SELF g_thread_self ()
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||
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||
#define SOURCE_DESTROYED(source) (((source)->flags & G_HOOK_FLAG_ACTIVE) == 0)
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||
#define SOURCE_BLOCKED(source) (((source)->flags & G_SOURCE_BLOCKED) != 0)
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||
|
||
/* Forward declarations */
|
||
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||
static void g_source_unref_internal (GSource *source,
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||
GMainContext *context,
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||
gboolean have_lock);
|
||
static void g_source_destroy_internal (GSource *source,
|
||
GMainContext *context,
|
||
gboolean have_lock);
|
||
static void g_source_set_priority_unlocked (GSource *source,
|
||
GMainContext *context,
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||
gint priority);
|
||
static void g_child_source_remove_internal (GSource *child_source,
|
||
GMainContext *context);
|
||
|
||
static void g_main_context_poll (GMainContext *context,
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||
gint timeout,
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||
gint priority,
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||
GPollFD *fds,
|
||
gint n_fds);
|
||
static void g_main_context_add_poll_unlocked (GMainContext *context,
|
||
gint priority,
|
||
GPollFD *fd);
|
||
static void g_main_context_remove_poll_unlocked (GMainContext *context,
|
||
GPollFD *fd);
|
||
|
||
static void g_source_iter_init (GSourceIter *iter,
|
||
GMainContext *context,
|
||
gboolean may_modify);
|
||
static gboolean g_source_iter_next (GSourceIter *iter,
|
||
GSource **source);
|
||
static void g_source_iter_clear (GSourceIter *iter);
|
||
|
||
static gboolean g_timeout_dispatch (GSource *source,
|
||
GSourceFunc callback,
|
||
gpointer user_data);
|
||
static gboolean g_child_watch_prepare (GSource *source,
|
||
gint *timeout);
|
||
static gboolean g_child_watch_check (GSource *source);
|
||
static gboolean g_child_watch_dispatch (GSource *source,
|
||
GSourceFunc callback,
|
||
gpointer user_data);
|
||
static void g_child_watch_finalize (GSource *source);
|
||
#ifdef G_OS_UNIX
|
||
static void g_unix_signal_handler (int signum);
|
||
static gboolean g_unix_signal_watch_prepare (GSource *source,
|
||
gint *timeout);
|
||
static gboolean g_unix_signal_watch_check (GSource *source);
|
||
static gboolean g_unix_signal_watch_dispatch (GSource *source,
|
||
GSourceFunc callback,
|
||
gpointer user_data);
|
||
static void g_unix_signal_watch_finalize (GSource *source);
|
||
#endif
|
||
static gboolean g_idle_prepare (GSource *source,
|
||
gint *timeout);
|
||
static gboolean g_idle_check (GSource *source);
|
||
static gboolean g_idle_dispatch (GSource *source,
|
||
GSourceFunc callback,
|
||
gpointer user_data);
|
||
|
||
static void block_source (GSource *source);
|
||
|
||
static GMainContext *glib_worker_context;
|
||
|
||
#ifndef G_OS_WIN32
|
||
|
||
|
||
/* UNIX signals work by marking one of these variables then waking the
|
||
* worker context to check on them and dispatch accordingly.
|
||
*/
|
||
#ifdef HAVE_SIG_ATOMIC_T
|
||
static volatile sig_atomic_t unix_signal_pending[NSIG];
|
||
static volatile sig_atomic_t any_unix_signal_pending;
|
||
#else
|
||
static volatile int unix_signal_pending[NSIG];
|
||
static volatile int any_unix_signal_pending;
|
||
#endif
|
||
|
||
/* Guards all the data below */
|
||
G_LOCK_DEFINE_STATIC (unix_signal_lock);
|
||
static guint unix_signal_refcount[NSIG];
|
||
static GSList *unix_signal_watches;
|
||
static GSList *unix_child_watches;
|
||
|
||
GSourceFuncs g_unix_signal_funcs =
|
||
{
|
||
g_unix_signal_watch_prepare,
|
||
g_unix_signal_watch_check,
|
||
g_unix_signal_watch_dispatch,
|
||
g_unix_signal_watch_finalize,
|
||
NULL, NULL
|
||
};
|
||
#endif /* !G_OS_WIN32 */
|
||
G_LOCK_DEFINE_STATIC (main_context_list);
|
||
static GSList *main_context_list = NULL;
|
||
|
||
GSourceFuncs g_timeout_funcs =
|
||
{
|
||
NULL, /* prepare */
|
||
NULL, /* check */
|
||
g_timeout_dispatch,
|
||
NULL, NULL, NULL
|
||
};
|
||
|
||
GSourceFuncs g_child_watch_funcs =
|
||
{
|
||
g_child_watch_prepare,
|
||
g_child_watch_check,
|
||
g_child_watch_dispatch,
|
||
g_child_watch_finalize,
|
||
NULL, NULL
|
||
};
|
||
|
||
GSourceFuncs g_idle_funcs =
|
||
{
|
||
g_idle_prepare,
|
||
g_idle_check,
|
||
g_idle_dispatch,
|
||
NULL, NULL, NULL
|
||
};
|
||
|
||
/**
|
||
* g_main_context_ref:
|
||
* @context: a #GMainContext
|
||
*
|
||
* Increases the reference count on a #GMainContext object by one.
|
||
*
|
||
* Returns: the @context that was passed in (since 2.6)
|
||
**/
|
||
GMainContext *
|
||
g_main_context_ref (GMainContext *context)
|
||
{
|
||
g_return_val_if_fail (context != NULL, NULL);
|
||
g_return_val_if_fail (g_atomic_int_get (&context->ref_count) > 0, NULL);
|
||
|
||
g_atomic_int_inc (&context->ref_count);
|
||
|
||
return context;
|
||
}
|
||
|
||
static inline void
|
||
poll_rec_list_free (GMainContext *context,
|
||
GPollRec *list)
|
||
{
|
||
g_slice_free_chain (GPollRec, list, next);
|
||
}
|
||
|
||
/**
|
||
* g_main_context_unref:
|
||
* @context: a #GMainContext
|
||
*
|
||
* Decreases the reference count on a #GMainContext object by one. If
|
||
* the result is zero, free the context and free all associated memory.
|
||
**/
|
||
void
|
||
g_main_context_unref (GMainContext *context)
|
||
{
|
||
GSourceIter iter;
|
||
GSource *source;
|
||
GList *sl_iter;
|
||
GSourceList *list;
|
||
guint i;
|
||
|
||
g_return_if_fail (context != NULL);
|
||
g_return_if_fail (g_atomic_int_get (&context->ref_count) > 0);
|
||
|
||
if (!g_atomic_int_dec_and_test (&context->ref_count))
|
||
return;
|
||
|
||
G_LOCK (main_context_list);
|
||
main_context_list = g_slist_remove (main_context_list, context);
|
||
G_UNLOCK (main_context_list);
|
||
|
||
/* Free pending dispatches */
|
||
for (i = 0; i < context->pending_dispatches->len; i++)
|
||
g_source_unref_internal (context->pending_dispatches->pdata[i], context, FALSE);
|
||
|
||
/* g_source_iter_next() assumes the context is locked. */
|
||
LOCK_CONTEXT (context);
|
||
g_source_iter_init (&iter, context, TRUE);
|
||
while (g_source_iter_next (&iter, &source))
|
||
{
|
||
source->context = NULL;
|
||
g_source_destroy_internal (source, context, TRUE);
|
||
}
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
for (sl_iter = context->source_lists; sl_iter; sl_iter = sl_iter->next)
|
||
{
|
||
list = sl_iter->data;
|
||
g_slice_free (GSourceList, list);
|
||
}
|
||
g_list_free (context->source_lists);
|
||
|
||
g_hash_table_destroy (context->sources);
|
||
|
||
g_mutex_clear (&context->mutex);
|
||
|
||
g_ptr_array_free (context->pending_dispatches, TRUE);
|
||
g_free (context->cached_poll_array);
|
||
|
||
poll_rec_list_free (context, context->poll_records);
|
||
|
||
g_wakeup_free (context->wakeup);
|
||
g_cond_clear (&context->cond);
|
||
|
||
g_free (context);
|
||
}
|
||
|
||
/* Helper function used by mainloop/overflow test.
|
||
*/
|
||
GMainContext *
|
||
g_main_context_new_with_next_id (guint next_id)
|
||
{
|
||
GMainContext *ret = g_main_context_new ();
|
||
|
||
ret->next_id = next_id;
|
||
|
||
return ret;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_new:
|
||
*
|
||
* Creates a new #GMainContext structure.
|
||
*
|
||
* Returns: the new #GMainContext
|
||
**/
|
||
GMainContext *
|
||
g_main_context_new (void)
|
||
{
|
||
static gsize initialised;
|
||
GMainContext *context;
|
||
|
||
if (g_once_init_enter (&initialised))
|
||
{
|
||
#ifdef G_MAIN_POLL_DEBUG
|
||
if (getenv ("G_MAIN_POLL_DEBUG") != NULL)
|
||
_g_main_poll_debug = TRUE;
|
||
#endif
|
||
|
||
g_once_init_leave (&initialised, TRUE);
|
||
}
|
||
|
||
context = g_new0 (GMainContext, 1);
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_NEW (context));
|
||
|
||
g_mutex_init (&context->mutex);
|
||
g_cond_init (&context->cond);
|
||
|
||
context->sources = g_hash_table_new (NULL, NULL);
|
||
context->owner = NULL;
|
||
context->waiters = NULL;
|
||
|
||
context->ref_count = 1;
|
||
|
||
context->next_id = 1;
|
||
|
||
context->source_lists = NULL;
|
||
|
||
context->poll_func = g_poll;
|
||
|
||
context->cached_poll_array = NULL;
|
||
context->cached_poll_array_size = 0;
|
||
|
||
context->pending_dispatches = g_ptr_array_new ();
|
||
|
||
context->time_is_fresh = FALSE;
|
||
|
||
context->wakeup = g_wakeup_new ();
|
||
g_wakeup_get_pollfd (context->wakeup, &context->wake_up_rec);
|
||
g_main_context_add_poll_unlocked (context, 0, &context->wake_up_rec);
|
||
|
||
G_LOCK (main_context_list);
|
||
main_context_list = g_slist_append (main_context_list, context);
|
||
|
||
#ifdef G_MAIN_POLL_DEBUG
|
||
if (_g_main_poll_debug)
|
||
g_print ("created context=%p\n", context);
|
||
#endif
|
||
|
||
G_UNLOCK (main_context_list);
|
||
|
||
return context;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_default:
|
||
*
|
||
* Returns the global default main context. This is the main context
|
||
* used for main loop functions when a main loop is not explicitly
|
||
* specified, and corresponds to the "main" main loop. See also
|
||
* g_main_context_get_thread_default().
|
||
*
|
||
* Returns: (transfer none): the global default main context.
|
||
**/
|
||
GMainContext *
|
||
g_main_context_default (void)
|
||
{
|
||
static GMainContext *default_main_context = NULL;
|
||
|
||
if (g_once_init_enter (&default_main_context))
|
||
{
|
||
GMainContext *context;
|
||
|
||
context = g_main_context_new ();
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_DEFAULT (context));
|
||
|
||
#ifdef G_MAIN_POLL_DEBUG
|
||
if (_g_main_poll_debug)
|
||
g_print ("default context=%p\n", context);
|
||
#endif
|
||
|
||
g_once_init_leave (&default_main_context, context);
|
||
}
|
||
|
||
return default_main_context;
|
||
}
|
||
|
||
static void
|
||
free_context (gpointer data)
|
||
{
|
||
GMainContext *context = data;
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_FREE (context));
|
||
|
||
g_main_context_release (context);
|
||
if (context)
|
||
g_main_context_unref (context);
|
||
}
|
||
|
||
static void
|
||
free_context_stack (gpointer data)
|
||
{
|
||
g_queue_free_full((GQueue *) data, (GDestroyNotify) free_context);
|
||
}
|
||
|
||
static GPrivate thread_context_stack = G_PRIVATE_INIT (free_context_stack);
|
||
|
||
/**
|
||
* g_main_context_push_thread_default:
|
||
* @context: (nullable): a #GMainContext, or %NULL for the global default context
|
||
*
|
||
* Acquires @context and sets it as the thread-default context for the
|
||
* current thread. This will cause certain asynchronous operations
|
||
* (such as most [gio][gio]-based I/O) which are
|
||
* started in this thread to run under @context and deliver their
|
||
* results to its main loop, rather than running under the global
|
||
* default context in the main thread. Note that calling this function
|
||
* changes the context returned by g_main_context_get_thread_default(),
|
||
* not the one returned by g_main_context_default(), so it does not affect
|
||
* the context used by functions like g_idle_add().
|
||
*
|
||
* Normally you would call this function shortly after creating a new
|
||
* thread, passing it a #GMainContext which will be run by a
|
||
* #GMainLoop in that thread, to set a new default context for all
|
||
* async operations in that thread. In this case you may not need to
|
||
* ever call g_main_context_pop_thread_default(), assuming you want the
|
||
* new #GMainContext to be the default for the whole lifecycle of the
|
||
* thread.
|
||
*
|
||
* If you don't have control over how the new thread was created (e.g.
|
||
* in the new thread isn't newly created, or if the thread life
|
||
* cycle is managed by a #GThreadPool), it is always suggested to wrap
|
||
* the logic that needs to use the new #GMainContext inside a
|
||
* g_main_context_push_thread_default() / g_main_context_pop_thread_default()
|
||
* pair, otherwise threads that are re-used will end up never explicitly
|
||
* releasing the #GMainContext reference they hold.
|
||
*
|
||
* In some cases you may want to schedule a single operation in a
|
||
* non-default context, or temporarily use a non-default context in
|
||
* the main thread. In that case, you can wrap the call to the
|
||
* asynchronous operation inside a
|
||
* g_main_context_push_thread_default() /
|
||
* g_main_context_pop_thread_default() pair, but it is up to you to
|
||
* ensure that no other asynchronous operations accidentally get
|
||
* started while the non-default context is active.
|
||
*
|
||
* Beware that libraries that predate this function may not correctly
|
||
* handle being used from a thread with a thread-default context. Eg,
|
||
* see g_file_supports_thread_contexts().
|
||
*
|
||
* Since: 2.22
|
||
**/
|
||
void
|
||
g_main_context_push_thread_default (GMainContext *context)
|
||
{
|
||
GQueue *stack;
|
||
gboolean acquired_context;
|
||
|
||
acquired_context = g_main_context_acquire (context);
|
||
g_return_if_fail (acquired_context);
|
||
|
||
if (context == g_main_context_default ())
|
||
context = NULL;
|
||
else if (context)
|
||
g_main_context_ref (context);
|
||
|
||
stack = g_private_get (&thread_context_stack);
|
||
if (!stack)
|
||
{
|
||
stack = g_queue_new ();
|
||
g_private_set (&thread_context_stack, stack);
|
||
}
|
||
|
||
g_queue_push_head (stack, context);
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_PUSH_THREAD_DEFAULT (context));
|
||
}
|
||
|
||
/**
|
||
* g_main_context_pop_thread_default:
|
||
* @context: (nullable): a #GMainContext object, or %NULL
|
||
*
|
||
* Pops @context off the thread-default context stack (verifying that
|
||
* it was on the top of the stack).
|
||
*
|
||
* Since: 2.22
|
||
**/
|
||
void
|
||
g_main_context_pop_thread_default (GMainContext *context)
|
||
{
|
||
GQueue *stack;
|
||
|
||
if (context == g_main_context_default ())
|
||
context = NULL;
|
||
|
||
stack = g_private_get (&thread_context_stack);
|
||
|
||
g_return_if_fail (stack != NULL);
|
||
g_return_if_fail (g_queue_peek_head (stack) == context);
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_POP_THREAD_DEFAULT (context));
|
||
|
||
g_queue_pop_head (stack);
|
||
|
||
g_main_context_release (context);
|
||
if (context)
|
||
g_main_context_unref (context);
|
||
}
|
||
|
||
/**
|
||
* g_main_context_get_thread_default:
|
||
*
|
||
* Gets the thread-default #GMainContext for this thread. Asynchronous
|
||
* operations that want to be able to be run in contexts other than
|
||
* the default one should call this method or
|
||
* g_main_context_ref_thread_default() to get a #GMainContext to add
|
||
* their #GSources to. (Note that even in single-threaded
|
||
* programs applications may sometimes want to temporarily push a
|
||
* non-default context, so it is not safe to assume that this will
|
||
* always return %NULL if you are running in the default thread.)
|
||
*
|
||
* If you need to hold a reference on the context, use
|
||
* g_main_context_ref_thread_default() instead.
|
||
*
|
||
* Returns: (transfer none): the thread-default #GMainContext, or
|
||
* %NULL if the thread-default context is the global default context.
|
||
*
|
||
* Since: 2.22
|
||
**/
|
||
GMainContext *
|
||
g_main_context_get_thread_default (void)
|
||
{
|
||
GQueue *stack;
|
||
|
||
stack = g_private_get (&thread_context_stack);
|
||
if (stack)
|
||
return g_queue_peek_head (stack);
|
||
else
|
||
return NULL;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_ref_thread_default:
|
||
*
|
||
* Gets the thread-default #GMainContext for this thread, as with
|
||
* g_main_context_get_thread_default(), but also adds a reference to
|
||
* it with g_main_context_ref(). In addition, unlike
|
||
* g_main_context_get_thread_default(), if the thread-default context
|
||
* is the global default context, this will return that #GMainContext
|
||
* (with a ref added to it) rather than returning %NULL.
|
||
*
|
||
* Returns: (transfer full): the thread-default #GMainContext. Unref
|
||
* with g_main_context_unref() when you are done with it.
|
||
*
|
||
* Since: 2.32
|
||
*/
|
||
GMainContext *
|
||
g_main_context_ref_thread_default (void)
|
||
{
|
||
GMainContext *context;
|
||
|
||
context = g_main_context_get_thread_default ();
|
||
if (!context)
|
||
context = g_main_context_default ();
|
||
return g_main_context_ref (context);
|
||
}
|
||
|
||
/* Hooks for adding to the main loop */
|
||
|
||
/**
|
||
* g_source_new:
|
||
* @source_funcs: structure containing functions that implement
|
||
* the sources behavior.
|
||
* @struct_size: size of the #GSource structure to create.
|
||
*
|
||
* Creates a new #GSource structure. The size is specified to
|
||
* allow creating structures derived from #GSource that contain
|
||
* additional data. The size passed in must be at least
|
||
* `sizeof (GSource)`.
|
||
*
|
||
* The source will not initially be associated with any #GMainContext
|
||
* and must be added to one with g_source_attach() before it will be
|
||
* executed.
|
||
*
|
||
* Returns: the newly-created #GSource.
|
||
**/
|
||
GSource *
|
||
g_source_new (GSourceFuncs *source_funcs,
|
||
guint struct_size)
|
||
{
|
||
GSource *source;
|
||
|
||
g_return_val_if_fail (source_funcs != NULL, NULL);
|
||
g_return_val_if_fail (struct_size >= sizeof (GSource), NULL);
|
||
|
||
source = (GSource*) g_malloc0 (struct_size);
|
||
source->priv = g_slice_new0 (GSourcePrivate);
|
||
source->source_funcs = source_funcs;
|
||
source->ref_count = 1;
|
||
|
||
source->priority = G_PRIORITY_DEFAULT;
|
||
|
||
source->flags = G_HOOK_FLAG_ACTIVE;
|
||
|
||
source->priv->ready_time = -1;
|
||
|
||
/* NULL/0 initialization for all other fields */
|
||
|
||
TRACE (GLIB_SOURCE_NEW (source, source_funcs->prepare, source_funcs->check,
|
||
source_funcs->dispatch, source_funcs->finalize,
|
||
struct_size));
|
||
|
||
return source;
|
||
}
|
||
|
||
/* Holds context's lock */
|
||
static void
|
||
g_source_iter_init (GSourceIter *iter,
|
||
GMainContext *context,
|
||
gboolean may_modify)
|
||
{
|
||
iter->context = context;
|
||
iter->current_list = NULL;
|
||
iter->source = NULL;
|
||
iter->may_modify = may_modify;
|
||
}
|
||
|
||
/* Holds context's lock */
|
||
static gboolean
|
||
g_source_iter_next (GSourceIter *iter, GSource **source)
|
||
{
|
||
GSource *next_source;
|
||
|
||
if (iter->source)
|
||
next_source = iter->source->next;
|
||
else
|
||
next_source = NULL;
|
||
|
||
if (!next_source)
|
||
{
|
||
if (iter->current_list)
|
||
iter->current_list = iter->current_list->next;
|
||
else
|
||
iter->current_list = iter->context->source_lists;
|
||
|
||
if (iter->current_list)
|
||
{
|
||
GSourceList *source_list = iter->current_list->data;
|
||
|
||
next_source = source_list->head;
|
||
}
|
||
}
|
||
|
||
/* Note: unreffing iter->source could potentially cause its
|
||
* GSourceList to be removed from source_lists (if iter->source is
|
||
* the only source in its list, and it is destroyed), so we have to
|
||
* keep it reffed until after we advance iter->current_list, above.
|
||
*/
|
||
|
||
if (iter->source && iter->may_modify)
|
||
g_source_unref_internal (iter->source, iter->context, TRUE);
|
||
iter->source = next_source;
|
||
if (iter->source && iter->may_modify)
|
||
g_source_ref (iter->source);
|
||
|
||
*source = iter->source;
|
||
return *source != NULL;
|
||
}
|
||
|
||
/* Holds context's lock. Only necessary to call if you broke out of
|
||
* the g_source_iter_next() loop early.
|
||
*/
|
||
static void
|
||
g_source_iter_clear (GSourceIter *iter)
|
||
{
|
||
if (iter->source && iter->may_modify)
|
||
{
|
||
g_source_unref_internal (iter->source, iter->context, TRUE);
|
||
iter->source = NULL;
|
||
}
|
||
}
|
||
|
||
/* Holds context's lock
|
||
*/
|
||
static GSourceList *
|
||
find_source_list_for_priority (GMainContext *context,
|
||
gint priority,
|
||
gboolean create)
|
||
{
|
||
GList *iter, *last;
|
||
GSourceList *source_list;
|
||
|
||
last = NULL;
|
||
for (iter = context->source_lists; iter != NULL; last = iter, iter = iter->next)
|
||
{
|
||
source_list = iter->data;
|
||
|
||
if (source_list->priority == priority)
|
||
return source_list;
|
||
|
||
if (source_list->priority > priority)
|
||
{
|
||
if (!create)
|
||
return NULL;
|
||
|
||
source_list = g_slice_new0 (GSourceList);
|
||
source_list->priority = priority;
|
||
context->source_lists = g_list_insert_before (context->source_lists,
|
||
iter,
|
||
source_list);
|
||
return source_list;
|
||
}
|
||
}
|
||
|
||
if (!create)
|
||
return NULL;
|
||
|
||
source_list = g_slice_new0 (GSourceList);
|
||
source_list->priority = priority;
|
||
|
||
if (!last)
|
||
context->source_lists = g_list_append (NULL, source_list);
|
||
else
|
||
{
|
||
/* This just appends source_list to the end of
|
||
* context->source_lists without having to walk the list again.
|
||
*/
|
||
last = g_list_append (last, source_list);
|
||
(void) last;
|
||
}
|
||
return source_list;
|
||
}
|
||
|
||
/* Holds context's lock
|
||
*/
|
||
static void
|
||
source_add_to_context (GSource *source,
|
||
GMainContext *context)
|
||
{
|
||
GSourceList *source_list;
|
||
GSource *prev, *next;
|
||
|
||
source_list = find_source_list_for_priority (context, source->priority, TRUE);
|
||
|
||
if (source->priv->parent_source)
|
||
{
|
||
g_assert (source_list->head != NULL);
|
||
|
||
/* Put the source immediately before its parent */
|
||
prev = source->priv->parent_source->prev;
|
||
next = source->priv->parent_source;
|
||
}
|
||
else
|
||
{
|
||
prev = source_list->tail;
|
||
next = NULL;
|
||
}
|
||
|
||
source->next = next;
|
||
if (next)
|
||
next->prev = source;
|
||
else
|
||
source_list->tail = source;
|
||
|
||
source->prev = prev;
|
||
if (prev)
|
||
prev->next = source;
|
||
else
|
||
source_list->head = source;
|
||
}
|
||
|
||
/* Holds context's lock
|
||
*/
|
||
static void
|
||
source_remove_from_context (GSource *source,
|
||
GMainContext *context)
|
||
{
|
||
GSourceList *source_list;
|
||
|
||
source_list = find_source_list_for_priority (context, source->priority, FALSE);
|
||
g_return_if_fail (source_list != NULL);
|
||
|
||
if (source->prev)
|
||
source->prev->next = source->next;
|
||
else
|
||
source_list->head = source->next;
|
||
|
||
if (source->next)
|
||
source->next->prev = source->prev;
|
||
else
|
||
source_list->tail = source->prev;
|
||
|
||
source->prev = NULL;
|
||
source->next = NULL;
|
||
|
||
if (source_list->head == NULL)
|
||
{
|
||
context->source_lists = g_list_remove (context->source_lists, source_list);
|
||
g_slice_free (GSourceList, source_list);
|
||
}
|
||
}
|
||
|
||
static guint
|
||
g_source_attach_unlocked (GSource *source,
|
||
GMainContext *context,
|
||
gboolean do_wakeup)
|
||
{
|
||
GSList *tmp_list;
|
||
guint id;
|
||
|
||
/* The counter may have wrapped, so we must ensure that we do not
|
||
* reuse the source id of an existing source.
|
||
*/
|
||
do
|
||
id = context->next_id++;
|
||
while (id == 0 || g_hash_table_contains (context->sources, GUINT_TO_POINTER (id)));
|
||
|
||
source->context = context;
|
||
source->source_id = id;
|
||
g_source_ref (source);
|
||
|
||
g_hash_table_insert (context->sources, GUINT_TO_POINTER (id), source);
|
||
|
||
source_add_to_context (source, context);
|
||
|
||
if (!SOURCE_BLOCKED (source))
|
||
{
|
||
tmp_list = source->poll_fds;
|
||
while (tmp_list)
|
||
{
|
||
g_main_context_add_poll_unlocked (context, source->priority, tmp_list->data);
|
||
tmp_list = tmp_list->next;
|
||
}
|
||
|
||
for (tmp_list = source->priv->fds; tmp_list; tmp_list = tmp_list->next)
|
||
g_main_context_add_poll_unlocked (context, source->priority, tmp_list->data);
|
||
}
|
||
|
||
tmp_list = source->priv->child_sources;
|
||
while (tmp_list)
|
||
{
|
||
g_source_attach_unlocked (tmp_list->data, context, FALSE);
|
||
tmp_list = tmp_list->next;
|
||
}
|
||
|
||
/* If another thread has acquired the context, wake it up since it
|
||
* might be in poll() right now.
|
||
*/
|
||
if (do_wakeup && context->owner && context->owner != G_THREAD_SELF)
|
||
g_wakeup_signal (context->wakeup);
|
||
|
||
return source->source_id;
|
||
}
|
||
|
||
/**
|
||
* g_source_attach:
|
||
* @source: a #GSource
|
||
* @context: (nullable): a #GMainContext (if %NULL, the default context will be used)
|
||
*
|
||
* Adds a #GSource to a @context so that it will be executed within
|
||
* that context. Remove it by calling g_source_destroy().
|
||
*
|
||
* Returns: the ID (greater than 0) for the source within the
|
||
* #GMainContext.
|
||
**/
|
||
guint
|
||
g_source_attach (GSource *source,
|
||
GMainContext *context)
|
||
{
|
||
guint result = 0;
|
||
|
||
g_return_val_if_fail (source->context == NULL, 0);
|
||
g_return_val_if_fail (!SOURCE_DESTROYED (source), 0);
|
||
|
||
if (!context)
|
||
context = g_main_context_default ();
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
result = g_source_attach_unlocked (source, context, TRUE);
|
||
|
||
TRACE (GLIB_MAIN_SOURCE_ATTACH (g_source_get_name (source), source, context,
|
||
result));
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return result;
|
||
}
|
||
|
||
static void
|
||
g_source_destroy_internal (GSource *source,
|
||
GMainContext *context,
|
||
gboolean have_lock)
|
||
{
|
||
TRACE (GLIB_MAIN_SOURCE_DESTROY (g_source_get_name (source), source,
|
||
context));
|
||
|
||
if (!have_lock)
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (!SOURCE_DESTROYED (source))
|
||
{
|
||
GSList *tmp_list;
|
||
gpointer old_cb_data;
|
||
GSourceCallbackFuncs *old_cb_funcs;
|
||
|
||
source->flags &= ~G_HOOK_FLAG_ACTIVE;
|
||
|
||
old_cb_data = source->callback_data;
|
||
old_cb_funcs = source->callback_funcs;
|
||
|
||
source->callback_data = NULL;
|
||
source->callback_funcs = NULL;
|
||
|
||
if (old_cb_funcs)
|
||
{
|
||
UNLOCK_CONTEXT (context);
|
||
old_cb_funcs->unref (old_cb_data);
|
||
LOCK_CONTEXT (context);
|
||
}
|
||
|
||
if (!SOURCE_BLOCKED (source))
|
||
{
|
||
tmp_list = source->poll_fds;
|
||
while (tmp_list)
|
||
{
|
||
g_main_context_remove_poll_unlocked (context, tmp_list->data);
|
||
tmp_list = tmp_list->next;
|
||
}
|
||
|
||
for (tmp_list = source->priv->fds; tmp_list; tmp_list = tmp_list->next)
|
||
g_main_context_remove_poll_unlocked (context, tmp_list->data);
|
||
}
|
||
|
||
while (source->priv->child_sources)
|
||
g_child_source_remove_internal (source->priv->child_sources->data, context);
|
||
|
||
if (source->priv->parent_source)
|
||
g_child_source_remove_internal (source, context);
|
||
|
||
g_source_unref_internal (source, context, TRUE);
|
||
}
|
||
|
||
if (!have_lock)
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
/**
|
||
* g_source_destroy:
|
||
* @source: a #GSource
|
||
*
|
||
* Removes a source from its #GMainContext, if any, and mark it as
|
||
* destroyed. The source cannot be subsequently added to another
|
||
* context. It is safe to call this on sources which have already been
|
||
* removed from their context.
|
||
*
|
||
* This does not unref the #GSource: if you still hold a reference, use
|
||
* g_source_unref() to drop it.
|
||
*/
|
||
void
|
||
g_source_destroy (GSource *source)
|
||
{
|
||
GMainContext *context;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
|
||
context = source->context;
|
||
|
||
if (context)
|
||
g_source_destroy_internal (source, context, FALSE);
|
||
else
|
||
source->flags &= ~G_HOOK_FLAG_ACTIVE;
|
||
}
|
||
|
||
/**
|
||
* g_source_get_id:
|
||
* @source: a #GSource
|
||
*
|
||
* Returns the numeric ID for a particular source. The ID of a source
|
||
* is a positive integer which is unique within a particular main loop
|
||
* context. The reverse
|
||
* mapping from ID to source is done by g_main_context_find_source_by_id().
|
||
*
|
||
* You can only call this function while the source is associated to a
|
||
* #GMainContext instance; calling this function before g_source_attach()
|
||
* or after g_source_destroy() yields undefined behavior. The ID returned
|
||
* is unique within the #GMainContext instance passed to g_source_attach().
|
||
*
|
||
* Returns: the ID (greater than 0) for the source
|
||
**/
|
||
guint
|
||
g_source_get_id (GSource *source)
|
||
{
|
||
guint result;
|
||
|
||
g_return_val_if_fail (source != NULL, 0);
|
||
g_return_val_if_fail (source->context != NULL, 0);
|
||
|
||
LOCK_CONTEXT (source->context);
|
||
result = source->source_id;
|
||
UNLOCK_CONTEXT (source->context);
|
||
|
||
return result;
|
||
}
|
||
|
||
/**
|
||
* g_source_get_context:
|
||
* @source: a #GSource
|
||
*
|
||
* Gets the #GMainContext with which the source is associated.
|
||
*
|
||
* You can call this on a source that has been destroyed, provided
|
||
* that the #GMainContext it was attached to still exists (in which
|
||
* case it will return that #GMainContext). In particular, you can
|
||
* always call this function on the source returned from
|
||
* g_main_current_source(). But calling this function on a source
|
||
* whose #GMainContext has been destroyed is an error.
|
||
*
|
||
* Returns: (transfer none) (nullable): the #GMainContext with which the
|
||
* source is associated, or %NULL if the context has not
|
||
* yet been added to a source.
|
||
**/
|
||
GMainContext *
|
||
g_source_get_context (GSource *source)
|
||
{
|
||
g_return_val_if_fail (source->context != NULL || !SOURCE_DESTROYED (source), NULL);
|
||
|
||
return source->context;
|
||
}
|
||
|
||
/**
|
||
* g_source_add_poll:
|
||
* @source:a #GSource
|
||
* @fd: a #GPollFD structure holding information about a file
|
||
* descriptor to watch.
|
||
*
|
||
* Adds a file descriptor to the set of file descriptors polled for
|
||
* this source. This is usually combined with g_source_new() to add an
|
||
* event source. The event source's check function will typically test
|
||
* the @revents field in the #GPollFD struct and return %TRUE if events need
|
||
* to be processed.
|
||
*
|
||
* This API is only intended to be used by implementations of #GSource.
|
||
* Do not call this API on a #GSource that you did not create.
|
||
*
|
||
* Using this API forces the linear scanning of event sources on each
|
||
* main loop iteration. Newly-written event sources should try to use
|
||
* g_source_add_unix_fd() instead of this API.
|
||
**/
|
||
void
|
||
g_source_add_poll (GSource *source,
|
||
GPollFD *fd)
|
||
{
|
||
GMainContext *context;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
g_return_if_fail (fd != NULL);
|
||
g_return_if_fail (!SOURCE_DESTROYED (source));
|
||
|
||
context = source->context;
|
||
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
|
||
source->poll_fds = g_slist_prepend (source->poll_fds, fd);
|
||
|
||
if (context)
|
||
{
|
||
if (!SOURCE_BLOCKED (source))
|
||
g_main_context_add_poll_unlocked (context, source->priority, fd);
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* g_source_remove_poll:
|
||
* @source:a #GSource
|
||
* @fd: a #GPollFD structure previously passed to g_source_add_poll().
|
||
*
|
||
* Removes a file descriptor from the set of file descriptors polled for
|
||
* this source.
|
||
*
|
||
* This API is only intended to be used by implementations of #GSource.
|
||
* Do not call this API on a #GSource that you did not create.
|
||
**/
|
||
void
|
||
g_source_remove_poll (GSource *source,
|
||
GPollFD *fd)
|
||
{
|
||
GMainContext *context;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
g_return_if_fail (fd != NULL);
|
||
g_return_if_fail (!SOURCE_DESTROYED (source));
|
||
|
||
context = source->context;
|
||
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
|
||
source->poll_fds = g_slist_remove (source->poll_fds, fd);
|
||
|
||
if (context)
|
||
{
|
||
if (!SOURCE_BLOCKED (source))
|
||
g_main_context_remove_poll_unlocked (context, fd);
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* g_source_add_child_source:
|
||
* @source:a #GSource
|
||
* @child_source: a second #GSource that @source should "poll"
|
||
*
|
||
* Adds @child_source to @source as a "polled" source; when @source is
|
||
* added to a #GMainContext, @child_source will be automatically added
|
||
* with the same priority, when @child_source is triggered, it will
|
||
* cause @source to dispatch (in addition to calling its own
|
||
* callback), and when @source is destroyed, it will destroy
|
||
* @child_source as well. (@source will also still be dispatched if
|
||
* its own prepare/check functions indicate that it is ready.)
|
||
*
|
||
* If you don't need @child_source to do anything on its own when it
|
||
* triggers, you can call g_source_set_dummy_callback() on it to set a
|
||
* callback that does nothing (except return %TRUE if appropriate).
|
||
*
|
||
* @source will hold a reference on @child_source while @child_source
|
||
* is attached to it.
|
||
*
|
||
* This API is only intended to be used by implementations of #GSource.
|
||
* Do not call this API on a #GSource that you did not create.
|
||
*
|
||
* Since: 2.28
|
||
**/
|
||
void
|
||
g_source_add_child_source (GSource *source,
|
||
GSource *child_source)
|
||
{
|
||
GMainContext *context;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
g_return_if_fail (child_source != NULL);
|
||
g_return_if_fail (!SOURCE_DESTROYED (source));
|
||
g_return_if_fail (!SOURCE_DESTROYED (child_source));
|
||
g_return_if_fail (child_source->context == NULL);
|
||
g_return_if_fail (child_source->priv->parent_source == NULL);
|
||
|
||
context = source->context;
|
||
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
|
||
TRACE (GLIB_SOURCE_ADD_CHILD_SOURCE (source, child_source));
|
||
|
||
source->priv->child_sources = g_slist_prepend (source->priv->child_sources,
|
||
g_source_ref (child_source));
|
||
child_source->priv->parent_source = source;
|
||
g_source_set_priority_unlocked (child_source, NULL, source->priority);
|
||
if (SOURCE_BLOCKED (source))
|
||
block_source (child_source);
|
||
|
||
if (context)
|
||
{
|
||
g_source_attach_unlocked (child_source, context, TRUE);
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
}
|
||
|
||
static void
|
||
g_child_source_remove_internal (GSource *child_source,
|
||
GMainContext *context)
|
||
{
|
||
GSource *parent_source = child_source->priv->parent_source;
|
||
|
||
parent_source->priv->child_sources =
|
||
g_slist_remove (parent_source->priv->child_sources, child_source);
|
||
child_source->priv->parent_source = NULL;
|
||
|
||
g_source_destroy_internal (child_source, context, TRUE);
|
||
g_source_unref_internal (child_source, context, TRUE);
|
||
}
|
||
|
||
/**
|
||
* g_source_remove_child_source:
|
||
* @source:a #GSource
|
||
* @child_source: a #GSource previously passed to
|
||
* g_source_add_child_source().
|
||
*
|
||
* Detaches @child_source from @source and destroys it.
|
||
*
|
||
* This API is only intended to be used by implementations of #GSource.
|
||
* Do not call this API on a #GSource that you did not create.
|
||
*
|
||
* Since: 2.28
|
||
**/
|
||
void
|
||
g_source_remove_child_source (GSource *source,
|
||
GSource *child_source)
|
||
{
|
||
GMainContext *context;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
g_return_if_fail (child_source != NULL);
|
||
g_return_if_fail (child_source->priv->parent_source == source);
|
||
g_return_if_fail (!SOURCE_DESTROYED (source));
|
||
g_return_if_fail (!SOURCE_DESTROYED (child_source));
|
||
|
||
context = source->context;
|
||
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
|
||
g_child_source_remove_internal (child_source, context);
|
||
|
||
if (context)
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
static void
|
||
g_source_callback_ref (gpointer cb_data)
|
||
{
|
||
GSourceCallback *callback = cb_data;
|
||
|
||
g_atomic_int_inc (&callback->ref_count);
|
||
}
|
||
|
||
static void
|
||
g_source_callback_unref (gpointer cb_data)
|
||
{
|
||
GSourceCallback *callback = cb_data;
|
||
|
||
if (g_atomic_int_dec_and_test (&callback->ref_count))
|
||
{
|
||
if (callback->notify)
|
||
callback->notify (callback->data);
|
||
g_free (callback);
|
||
}
|
||
}
|
||
|
||
static void
|
||
g_source_callback_get (gpointer cb_data,
|
||
GSource *source,
|
||
GSourceFunc *func,
|
||
gpointer *data)
|
||
{
|
||
GSourceCallback *callback = cb_data;
|
||
|
||
*func = callback->func;
|
||
*data = callback->data;
|
||
}
|
||
|
||
static GSourceCallbackFuncs g_source_callback_funcs = {
|
||
g_source_callback_ref,
|
||
g_source_callback_unref,
|
||
g_source_callback_get,
|
||
};
|
||
|
||
/**
|
||
* g_source_set_callback_indirect:
|
||
* @source: the source
|
||
* @callback_data: pointer to callback data "object"
|
||
* @callback_funcs: functions for reference counting @callback_data
|
||
* and getting the callback and data
|
||
*
|
||
* Sets the callback function storing the data as a refcounted callback
|
||
* "object". This is used internally. Note that calling
|
||
* g_source_set_callback_indirect() assumes
|
||
* an initial reference count on @callback_data, and thus
|
||
* @callback_funcs->unref will eventually be called once more
|
||
* than @callback_funcs->ref.
|
||
*
|
||
* It is safe to call this function multiple times on a source which has already
|
||
* been attached to a context. The changes will take effect for the next time
|
||
* the source is dispatched after this call returns.
|
||
**/
|
||
void
|
||
g_source_set_callback_indirect (GSource *source,
|
||
gpointer callback_data,
|
||
GSourceCallbackFuncs *callback_funcs)
|
||
{
|
||
GMainContext *context;
|
||
gpointer old_cb_data;
|
||
GSourceCallbackFuncs *old_cb_funcs;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
g_return_if_fail (callback_funcs != NULL || callback_data == NULL);
|
||
|
||
context = source->context;
|
||
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (callback_funcs != &g_source_callback_funcs)
|
||
{
|
||
TRACE (GLIB_SOURCE_SET_CALLBACK_INDIRECT (source, callback_data,
|
||
callback_funcs->ref,
|
||
callback_funcs->unref,
|
||
callback_funcs->get));
|
||
}
|
||
|
||
old_cb_data = source->callback_data;
|
||
old_cb_funcs = source->callback_funcs;
|
||
|
||
source->callback_data = callback_data;
|
||
source->callback_funcs = callback_funcs;
|
||
|
||
if (context)
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
if (old_cb_funcs)
|
||
old_cb_funcs->unref (old_cb_data);
|
||
}
|
||
|
||
/**
|
||
* g_source_set_callback:
|
||
* @source: the source
|
||
* @func: a callback function
|
||
* @data: the data to pass to callback function
|
||
* @notify: (nullable): a function to call when @data is no longer in use, or %NULL.
|
||
*
|
||
* Sets the callback function for a source. The callback for a source is
|
||
* called from the source's dispatch function.
|
||
*
|
||
* The exact type of @func depends on the type of source; ie. you
|
||
* should not count on @func being called with @data as its first
|
||
* parameter. Cast @func with G_SOURCE_FUNC() to avoid warnings about
|
||
* incompatible function types.
|
||
*
|
||
* See [memory management of sources][mainloop-memory-management] for details
|
||
* on how to handle memory management of @data.
|
||
*
|
||
* Typically, you won't use this function. Instead use functions specific
|
||
* to the type of source you are using, such as g_idle_add() or g_timeout_add().
|
||
*
|
||
* It is safe to call this function multiple times on a source which has already
|
||
* been attached to a context. The changes will take effect for the next time
|
||
* the source is dispatched after this call returns.
|
||
**/
|
||
void
|
||
g_source_set_callback (GSource *source,
|
||
GSourceFunc func,
|
||
gpointer data,
|
||
GDestroyNotify notify)
|
||
{
|
||
GSourceCallback *new_callback;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
|
||
TRACE (GLIB_SOURCE_SET_CALLBACK (source, func, data, notify));
|
||
|
||
new_callback = g_new (GSourceCallback, 1);
|
||
|
||
new_callback->ref_count = 1;
|
||
new_callback->func = func;
|
||
new_callback->data = data;
|
||
new_callback->notify = notify;
|
||
|
||
g_source_set_callback_indirect (source, new_callback, &g_source_callback_funcs);
|
||
}
|
||
|
||
|
||
/**
|
||
* g_source_set_funcs:
|
||
* @source: a #GSource
|
||
* @funcs: the new #GSourceFuncs
|
||
*
|
||
* Sets the source functions (can be used to override
|
||
* default implementations) of an unattached source.
|
||
*
|
||
* Since: 2.12
|
||
*/
|
||
void
|
||
g_source_set_funcs (GSource *source,
|
||
GSourceFuncs *funcs)
|
||
{
|
||
g_return_if_fail (source != NULL);
|
||
g_return_if_fail (source->context == NULL);
|
||
g_return_if_fail (g_atomic_int_get (&source->ref_count) > 0);
|
||
g_return_if_fail (funcs != NULL);
|
||
|
||
source->source_funcs = funcs;
|
||
}
|
||
|
||
static void
|
||
g_source_set_priority_unlocked (GSource *source,
|
||
GMainContext *context,
|
||
gint priority)
|
||
{
|
||
GSList *tmp_list;
|
||
|
||
g_return_if_fail (source->priv->parent_source == NULL ||
|
||
source->priv->parent_source->priority == priority);
|
||
|
||
TRACE (GLIB_SOURCE_SET_PRIORITY (source, context, priority));
|
||
|
||
if (context)
|
||
{
|
||
/* Remove the source from the context's source and then
|
||
* add it back after so it is sorted in the correct place
|
||
*/
|
||
source_remove_from_context (source, source->context);
|
||
}
|
||
|
||
source->priority = priority;
|
||
|
||
if (context)
|
||
{
|
||
source_add_to_context (source, source->context);
|
||
|
||
if (!SOURCE_BLOCKED (source))
|
||
{
|
||
tmp_list = source->poll_fds;
|
||
while (tmp_list)
|
||
{
|
||
g_main_context_remove_poll_unlocked (context, tmp_list->data);
|
||
g_main_context_add_poll_unlocked (context, priority, tmp_list->data);
|
||
|
||
tmp_list = tmp_list->next;
|
||
}
|
||
|
||
for (tmp_list = source->priv->fds; tmp_list; tmp_list = tmp_list->next)
|
||
{
|
||
g_main_context_remove_poll_unlocked (context, tmp_list->data);
|
||
g_main_context_add_poll_unlocked (context, priority, tmp_list->data);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (source->priv->child_sources)
|
||
{
|
||
tmp_list = source->priv->child_sources;
|
||
while (tmp_list)
|
||
{
|
||
g_source_set_priority_unlocked (tmp_list->data, context, priority);
|
||
tmp_list = tmp_list->next;
|
||
}
|
||
}
|
||
}
|
||
|
||
/**
|
||
* g_source_set_priority:
|
||
* @source: a #GSource
|
||
* @priority: the new priority.
|
||
*
|
||
* Sets the priority of a source. While the main loop is being run, a
|
||
* source will be dispatched if it is ready to be dispatched and no
|
||
* sources at a higher (numerically smaller) priority are ready to be
|
||
* dispatched.
|
||
*
|
||
* A child source always has the same priority as its parent. It is not
|
||
* permitted to change the priority of a source once it has been added
|
||
* as a child of another source.
|
||
**/
|
||
void
|
||
g_source_set_priority (GSource *source,
|
||
gint priority)
|
||
{
|
||
GMainContext *context;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
g_return_if_fail (source->priv->parent_source == NULL);
|
||
|
||
context = source->context;
|
||
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
g_source_set_priority_unlocked (source, context, priority);
|
||
if (context)
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
/**
|
||
* g_source_get_priority:
|
||
* @source: a #GSource
|
||
*
|
||
* Gets the priority of a source.
|
||
*
|
||
* Returns: the priority of the source
|
||
**/
|
||
gint
|
||
g_source_get_priority (GSource *source)
|
||
{
|
||
g_return_val_if_fail (source != NULL, 0);
|
||
|
||
return source->priority;
|
||
}
|
||
|
||
/**
|
||
* g_source_set_ready_time:
|
||
* @source: a #GSource
|
||
* @ready_time: the monotonic time at which the source will be ready,
|
||
* 0 for "immediately", -1 for "never"
|
||
*
|
||
* Sets a #GSource to be dispatched when the given monotonic time is
|
||
* reached (or passed). If the monotonic time is in the past (as it
|
||
* always will be if @ready_time is 0) then the source will be
|
||
* dispatched immediately.
|
||
*
|
||
* If @ready_time is -1 then the source is never woken up on the basis
|
||
* of the passage of time.
|
||
*
|
||
* Dispatching the source does not reset the ready time. You should do
|
||
* so yourself, from the source dispatch function.
|
||
*
|
||
* Note that if you have a pair of sources where the ready time of one
|
||
* suggests that it will be delivered first but the priority for the
|
||
* other suggests that it would be delivered first, and the ready time
|
||
* for both sources is reached during the same main context iteration,
|
||
* then the order of dispatch is undefined.
|
||
*
|
||
* It is a no-op to call this function on a #GSource which has already been
|
||
* destroyed with g_source_destroy().
|
||
*
|
||
* This API is only intended to be used by implementations of #GSource.
|
||
* Do not call this API on a #GSource that you did not create.
|
||
*
|
||
* Since: 2.36
|
||
**/
|
||
void
|
||
g_source_set_ready_time (GSource *source,
|
||
gint64 ready_time)
|
||
{
|
||
GMainContext *context;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
/* We deliberately don't check for ref_count > 0 here, because that
|
||
* breaks cancellable_source_cancelled() in GCancellable: it has no
|
||
* way to find out that the last-unref has happened until the
|
||
* finalize() function is called, but that's too late, because the
|
||
* ref_count already has already reached 0 before that time.
|
||
* However, priv is only poisoned (set to NULL) after finalize(),
|
||
* so we can use this as a simple guard against use-after-free.
|
||
* See https://bugzilla.gnome.org/show_bug.cgi?id=791754 */
|
||
g_return_if_fail (source->priv != NULL);
|
||
|
||
context = source->context;
|
||
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (source->priv->ready_time == ready_time)
|
||
{
|
||
if (context)
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return;
|
||
}
|
||
|
||
source->priv->ready_time = ready_time;
|
||
|
||
TRACE (GLIB_SOURCE_SET_READY_TIME (source, ready_time));
|
||
|
||
if (context)
|
||
{
|
||
/* Quite likely that we need to change the timeout on the poll */
|
||
if (!SOURCE_BLOCKED (source))
|
||
g_wakeup_signal (context->wakeup);
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* g_source_get_ready_time:
|
||
* @source: a #GSource
|
||
*
|
||
* Gets the "ready time" of @source, as set by
|
||
* g_source_set_ready_time().
|
||
*
|
||
* Any time before the current monotonic time (including 0) is an
|
||
* indication that the source will fire immediately.
|
||
*
|
||
* Returns: the monotonic ready time, -1 for "never"
|
||
**/
|
||
gint64
|
||
g_source_get_ready_time (GSource *source)
|
||
{
|
||
g_return_val_if_fail (source != NULL, -1);
|
||
|
||
return source->priv->ready_time;
|
||
}
|
||
|
||
/**
|
||
* g_source_set_can_recurse:
|
||
* @source: a #GSource
|
||
* @can_recurse: whether recursion is allowed for this source
|
||
*
|
||
* Sets whether a source can be called recursively. If @can_recurse is
|
||
* %TRUE, then while the source is being dispatched then this source
|
||
* will be processed normally. Otherwise, all processing of this
|
||
* source is blocked until the dispatch function returns.
|
||
**/
|
||
void
|
||
g_source_set_can_recurse (GSource *source,
|
||
gboolean can_recurse)
|
||
{
|
||
GMainContext *context;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
|
||
context = source->context;
|
||
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (can_recurse)
|
||
source->flags |= G_SOURCE_CAN_RECURSE;
|
||
else
|
||
source->flags &= ~G_SOURCE_CAN_RECURSE;
|
||
|
||
if (context)
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
/**
|
||
* g_source_get_can_recurse:
|
||
* @source: a #GSource
|
||
*
|
||
* Checks whether a source is allowed to be called recursively.
|
||
* see g_source_set_can_recurse().
|
||
*
|
||
* Returns: whether recursion is allowed.
|
||
**/
|
||
gboolean
|
||
g_source_get_can_recurse (GSource *source)
|
||
{
|
||
g_return_val_if_fail (source != NULL, FALSE);
|
||
|
||
return (source->flags & G_SOURCE_CAN_RECURSE) != 0;
|
||
}
|
||
|
||
|
||
/**
|
||
* g_source_set_name:
|
||
* @source: a #GSource
|
||
* @name: debug name for the source
|
||
*
|
||
* Sets a name for the source, used in debugging and profiling.
|
||
* The name defaults to #NULL.
|
||
*
|
||
* The source name should describe in a human-readable way
|
||
* what the source does. For example, "X11 event queue"
|
||
* or "GTK+ repaint idle handler" or whatever it is.
|
||
*
|
||
* It is permitted to call this function multiple times, but is not
|
||
* recommended due to the potential performance impact. For example,
|
||
* one could change the name in the "check" function of a #GSourceFuncs
|
||
* to include details like the event type in the source name.
|
||
*
|
||
* Use caution if changing the name while another thread may be
|
||
* accessing it with g_source_get_name(); that function does not copy
|
||
* the value, and changing the value will free it while the other thread
|
||
* may be attempting to use it.
|
||
*
|
||
* Since: 2.26
|
||
**/
|
||
void
|
||
g_source_set_name (GSource *source,
|
||
const char *name)
|
||
{
|
||
GMainContext *context;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
|
||
context = source->context;
|
||
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
|
||
TRACE (GLIB_SOURCE_SET_NAME (source, name));
|
||
|
||
/* setting back to NULL is allowed, just because it's
|
||
* weird if get_name can return NULL but you can't
|
||
* set that.
|
||
*/
|
||
|
||
g_free (source->name);
|
||
source->name = g_strdup (name);
|
||
|
||
if (context)
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
/**
|
||
* g_source_get_name:
|
||
* @source: a #GSource
|
||
*
|
||
* Gets a name for the source, used in debugging and profiling. The
|
||
* name may be #NULL if it has never been set with g_source_set_name().
|
||
*
|
||
* Returns: the name of the source
|
||
*
|
||
* Since: 2.26
|
||
**/
|
||
const char *
|
||
g_source_get_name (GSource *source)
|
||
{
|
||
g_return_val_if_fail (source != NULL, NULL);
|
||
|
||
return source->name;
|
||
}
|
||
|
||
/**
|
||
* g_source_set_name_by_id:
|
||
* @tag: a #GSource ID
|
||
* @name: debug name for the source
|
||
*
|
||
* Sets the name of a source using its ID.
|
||
*
|
||
* This is a convenience utility to set source names from the return
|
||
* value of g_idle_add(), g_timeout_add(), etc.
|
||
*
|
||
* It is a programmer error to attempt to set the name of a non-existent
|
||
* source.
|
||
*
|
||
* More specifically: source IDs can be reissued after a source has been
|
||
* destroyed and therefore it is never valid to use this function with a
|
||
* source ID which may have already been removed. An example is when
|
||
* scheduling an idle to run in another thread with g_idle_add(): the
|
||
* idle may already have run and been removed by the time this function
|
||
* is called on its (now invalid) source ID. This source ID may have
|
||
* been reissued, leading to the operation being performed against the
|
||
* wrong source.
|
||
*
|
||
* Since: 2.26
|
||
**/
|
||
void
|
||
g_source_set_name_by_id (guint tag,
|
||
const char *name)
|
||
{
|
||
GSource *source;
|
||
|
||
g_return_if_fail (tag > 0);
|
||
|
||
source = g_main_context_find_source_by_id (NULL, tag);
|
||
if (source == NULL)
|
||
return;
|
||
|
||
g_source_set_name (source, name);
|
||
}
|
||
|
||
|
||
/**
|
||
* g_source_ref:
|
||
* @source: a #GSource
|
||
*
|
||
* Increases the reference count on a source by one.
|
||
*
|
||
* Returns: @source
|
||
**/
|
||
GSource *
|
||
g_source_ref (GSource *source)
|
||
{
|
||
g_return_val_if_fail (source != NULL, NULL);
|
||
|
||
g_atomic_int_inc (&source->ref_count);
|
||
|
||
return source;
|
||
}
|
||
|
||
/* g_source_unref() but possible to call within context lock
|
||
*/
|
||
static void
|
||
g_source_unref_internal (GSource *source,
|
||
GMainContext *context,
|
||
gboolean have_lock)
|
||
{
|
||
gpointer old_cb_data = NULL;
|
||
GSourceCallbackFuncs *old_cb_funcs = NULL;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
|
||
if (!have_lock && context)
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (g_atomic_int_dec_and_test (&source->ref_count))
|
||
{
|
||
TRACE (GLIB_SOURCE_BEFORE_FREE (source, context,
|
||
source->source_funcs->finalize));
|
||
|
||
old_cb_data = source->callback_data;
|
||
old_cb_funcs = source->callback_funcs;
|
||
|
||
source->callback_data = NULL;
|
||
source->callback_funcs = NULL;
|
||
|
||
if (context)
|
||
{
|
||
if (!SOURCE_DESTROYED (source))
|
||
g_warning (G_STRLOC ": ref_count == 0, but source was still attached to a context!");
|
||
source_remove_from_context (source, context);
|
||
|
||
g_hash_table_remove (context->sources, GUINT_TO_POINTER (source->source_id));
|
||
}
|
||
|
||
if (source->source_funcs->finalize)
|
||
{
|
||
/* Temporarily increase the ref count again so that GSource methods
|
||
* can be called from finalize(). */
|
||
g_atomic_int_inc (&source->ref_count);
|
||
if (context)
|
||
UNLOCK_CONTEXT (context);
|
||
source->source_funcs->finalize (source);
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
g_atomic_int_add (&source->ref_count, -1);
|
||
}
|
||
|
||
if (old_cb_funcs)
|
||
{
|
||
/* Temporarily increase the ref count again so that GSource methods
|
||
* can be called from callback_funcs.unref(). */
|
||
g_atomic_int_inc (&source->ref_count);
|
||
if (context)
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
old_cb_funcs->unref (old_cb_data);
|
||
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
g_atomic_int_add (&source->ref_count, -1);
|
||
}
|
||
|
||
g_free (source->name);
|
||
source->name = NULL;
|
||
|
||
g_slist_free (source->poll_fds);
|
||
source->poll_fds = NULL;
|
||
|
||
g_slist_free_full (source->priv->fds, g_free);
|
||
|
||
while (source->priv->child_sources)
|
||
{
|
||
GSource *child_source = source->priv->child_sources->data;
|
||
|
||
source->priv->child_sources =
|
||
g_slist_remove (source->priv->child_sources, child_source);
|
||
child_source->priv->parent_source = NULL;
|
||
|
||
g_source_unref_internal (child_source, context, have_lock);
|
||
}
|
||
|
||
g_slice_free (GSourcePrivate, source->priv);
|
||
source->priv = NULL;
|
||
|
||
g_free (source);
|
||
}
|
||
|
||
if (!have_lock && context)
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
/**
|
||
* g_source_unref:
|
||
* @source: a #GSource
|
||
*
|
||
* Decreases the reference count of a source by one. If the
|
||
* resulting reference count is zero the source and associated
|
||
* memory will be destroyed.
|
||
**/
|
||
void
|
||
g_source_unref (GSource *source)
|
||
{
|
||
g_return_if_fail (source != NULL);
|
||
|
||
g_source_unref_internal (source, source->context, FALSE);
|
||
}
|
||
|
||
/**
|
||
* g_main_context_find_source_by_id:
|
||
* @context: (nullable): a #GMainContext (if %NULL, the default context will be used)
|
||
* @source_id: the source ID, as returned by g_source_get_id().
|
||
*
|
||
* Finds a #GSource given a pair of context and ID.
|
||
*
|
||
* It is a programmer error to attempt to look up a non-existent source.
|
||
*
|
||
* More specifically: source IDs can be reissued after a source has been
|
||
* destroyed and therefore it is never valid to use this function with a
|
||
* source ID which may have already been removed. An example is when
|
||
* scheduling an idle to run in another thread with g_idle_add(): the
|
||
* idle may already have run and been removed by the time this function
|
||
* is called on its (now invalid) source ID. This source ID may have
|
||
* been reissued, leading to the operation being performed against the
|
||
* wrong source.
|
||
*
|
||
* Returns: (transfer none): the #GSource
|
||
**/
|
||
GSource *
|
||
g_main_context_find_source_by_id (GMainContext *context,
|
||
guint source_id)
|
||
{
|
||
GSource *source;
|
||
|
||
g_return_val_if_fail (source_id > 0, NULL);
|
||
|
||
if (context == NULL)
|
||
context = g_main_context_default ();
|
||
|
||
LOCK_CONTEXT (context);
|
||
source = g_hash_table_lookup (context->sources, GUINT_TO_POINTER (source_id));
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
if (source && SOURCE_DESTROYED (source))
|
||
source = NULL;
|
||
|
||
return source;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_find_source_by_funcs_user_data:
|
||
* @context: (nullable): a #GMainContext (if %NULL, the default context will be used).
|
||
* @funcs: the @source_funcs passed to g_source_new().
|
||
* @user_data: the user data from the callback.
|
||
*
|
||
* Finds a source with the given source functions and user data. If
|
||
* multiple sources exist with the same source function and user data,
|
||
* the first one found will be returned.
|
||
*
|
||
* Returns: (transfer none): the source, if one was found, otherwise %NULL
|
||
**/
|
||
GSource *
|
||
g_main_context_find_source_by_funcs_user_data (GMainContext *context,
|
||
GSourceFuncs *funcs,
|
||
gpointer user_data)
|
||
{
|
||
GSourceIter iter;
|
||
GSource *source;
|
||
|
||
g_return_val_if_fail (funcs != NULL, NULL);
|
||
|
||
if (context == NULL)
|
||
context = g_main_context_default ();
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
g_source_iter_init (&iter, context, FALSE);
|
||
while (g_source_iter_next (&iter, &source))
|
||
{
|
||
if (!SOURCE_DESTROYED (source) &&
|
||
source->source_funcs == funcs &&
|
||
source->callback_funcs)
|
||
{
|
||
GSourceFunc callback;
|
||
gpointer callback_data;
|
||
|
||
source->callback_funcs->get (source->callback_data, source, &callback, &callback_data);
|
||
|
||
if (callback_data == user_data)
|
||
break;
|
||
}
|
||
}
|
||
g_source_iter_clear (&iter);
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return source;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_find_source_by_user_data:
|
||
* @context: a #GMainContext
|
||
* @user_data: the user_data for the callback.
|
||
*
|
||
* Finds a source with the given user data for the callback. If
|
||
* multiple sources exist with the same user data, the first
|
||
* one found will be returned.
|
||
*
|
||
* Returns: (transfer none): the source, if one was found, otherwise %NULL
|
||
**/
|
||
GSource *
|
||
g_main_context_find_source_by_user_data (GMainContext *context,
|
||
gpointer user_data)
|
||
{
|
||
GSourceIter iter;
|
||
GSource *source;
|
||
|
||
if (context == NULL)
|
||
context = g_main_context_default ();
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
g_source_iter_init (&iter, context, FALSE);
|
||
while (g_source_iter_next (&iter, &source))
|
||
{
|
||
if (!SOURCE_DESTROYED (source) &&
|
||
source->callback_funcs)
|
||
{
|
||
GSourceFunc callback;
|
||
gpointer callback_data = NULL;
|
||
|
||
source->callback_funcs->get (source->callback_data, source, &callback, &callback_data);
|
||
|
||
if (callback_data == user_data)
|
||
break;
|
||
}
|
||
}
|
||
g_source_iter_clear (&iter);
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return source;
|
||
}
|
||
|
||
/**
|
||
* g_source_remove:
|
||
* @tag: the ID of the source to remove.
|
||
*
|
||
* Removes the source with the given ID from the default main context. You must
|
||
* use g_source_destroy() for sources added to a non-default main context.
|
||
*
|
||
* The ID of a #GSource is given by g_source_get_id(), or will be
|
||
* returned by the functions g_source_attach(), g_idle_add(),
|
||
* g_idle_add_full(), g_timeout_add(), g_timeout_add_full(),
|
||
* g_child_watch_add(), g_child_watch_add_full(), g_io_add_watch(), and
|
||
* g_io_add_watch_full().
|
||
*
|
||
* It is a programmer error to attempt to remove a non-existent source.
|
||
*
|
||
* More specifically: source IDs can be reissued after a source has been
|
||
* destroyed and therefore it is never valid to use this function with a
|
||
* source ID which may have already been removed. An example is when
|
||
* scheduling an idle to run in another thread with g_idle_add(): the
|
||
* idle may already have run and been removed by the time this function
|
||
* is called on its (now invalid) source ID. This source ID may have
|
||
* been reissued, leading to the operation being performed against the
|
||
* wrong source.
|
||
*
|
||
* Returns: For historical reasons, this function always returns %TRUE
|
||
**/
|
||
gboolean
|
||
g_source_remove (guint tag)
|
||
{
|
||
GSource *source;
|
||
|
||
g_return_val_if_fail (tag > 0, FALSE);
|
||
|
||
source = g_main_context_find_source_by_id (NULL, tag);
|
||
if (source)
|
||
g_source_destroy (source);
|
||
else
|
||
g_critical ("Source ID %u was not found when attempting to remove it", tag);
|
||
|
||
return source != NULL;
|
||
}
|
||
|
||
/**
|
||
* g_source_remove_by_user_data:
|
||
* @user_data: the user_data for the callback.
|
||
*
|
||
* Removes a source from the default main loop context given the user
|
||
* data for the callback. If multiple sources exist with the same user
|
||
* data, only one will be destroyed.
|
||
*
|
||
* Returns: %TRUE if a source was found and removed.
|
||
**/
|
||
gboolean
|
||
g_source_remove_by_user_data (gpointer user_data)
|
||
{
|
||
GSource *source;
|
||
|
||
source = g_main_context_find_source_by_user_data (NULL, user_data);
|
||
if (source)
|
||
{
|
||
g_source_destroy (source);
|
||
return TRUE;
|
||
}
|
||
else
|
||
return FALSE;
|
||
}
|
||
|
||
/**
|
||
* g_source_remove_by_funcs_user_data:
|
||
* @funcs: The @source_funcs passed to g_source_new()
|
||
* @user_data: the user data for the callback
|
||
*
|
||
* Removes a source from the default main loop context given the
|
||
* source functions and user data. If multiple sources exist with the
|
||
* same source functions and user data, only one will be destroyed.
|
||
*
|
||
* Returns: %TRUE if a source was found and removed.
|
||
**/
|
||
gboolean
|
||
g_source_remove_by_funcs_user_data (GSourceFuncs *funcs,
|
||
gpointer user_data)
|
||
{
|
||
GSource *source;
|
||
|
||
g_return_val_if_fail (funcs != NULL, FALSE);
|
||
|
||
source = g_main_context_find_source_by_funcs_user_data (NULL, funcs, user_data);
|
||
if (source)
|
||
{
|
||
g_source_destroy (source);
|
||
return TRUE;
|
||
}
|
||
else
|
||
return FALSE;
|
||
}
|
||
|
||
/**
|
||
* g_clear_handle_id: (skip)
|
||
* @tag_ptr: (not nullable): a pointer to the handler ID
|
||
* @clear_func: (not nullable): the function to call to clear the handler
|
||
*
|
||
* Clears a numeric handler, such as a #GSource ID.
|
||
*
|
||
* @tag_ptr must be a valid pointer to the variable holding the handler.
|
||
*
|
||
* If the ID is zero then this function does nothing.
|
||
* Otherwise, clear_func() is called with the ID as a parameter, and the tag is
|
||
* set to zero.
|
||
*
|
||
* A macro is also included that allows this function to be used without
|
||
* pointer casts.
|
||
*
|
||
* Since: 2.56
|
||
*/
|
||
#undef g_clear_handle_id
|
||
void
|
||
g_clear_handle_id (guint *tag_ptr,
|
||
GClearHandleFunc clear_func)
|
||
{
|
||
guint _handle_id;
|
||
|
||
_handle_id = *tag_ptr;
|
||
if (_handle_id > 0)
|
||
{
|
||
*tag_ptr = 0;
|
||
clear_func (_handle_id);
|
||
}
|
||
}
|
||
|
||
#ifdef G_OS_UNIX
|
||
/**
|
||
* g_source_add_unix_fd:
|
||
* @source: a #GSource
|
||
* @fd: the fd to monitor
|
||
* @events: an event mask
|
||
*
|
||
* Monitors @fd for the IO events in @events.
|
||
*
|
||
* The tag returned by this function can be used to remove or modify the
|
||
* monitoring of the fd using g_source_remove_unix_fd() or
|
||
* g_source_modify_unix_fd().
|
||
*
|
||
* It is not necessary to remove the fd before destroying the source; it
|
||
* will be cleaned up automatically.
|
||
*
|
||
* This API is only intended to be used by implementations of #GSource.
|
||
* Do not call this API on a #GSource that you did not create.
|
||
*
|
||
* As the name suggests, this function is not available on Windows.
|
||
*
|
||
* Returns: (not nullable): an opaque tag
|
||
*
|
||
* Since: 2.36
|
||
**/
|
||
gpointer
|
||
g_source_add_unix_fd (GSource *source,
|
||
gint fd,
|
||
GIOCondition events)
|
||
{
|
||
GMainContext *context;
|
||
GPollFD *poll_fd;
|
||
|
||
g_return_val_if_fail (source != NULL, NULL);
|
||
g_return_val_if_fail (!SOURCE_DESTROYED (source), NULL);
|
||
|
||
poll_fd = g_new (GPollFD, 1);
|
||
poll_fd->fd = fd;
|
||
poll_fd->events = events;
|
||
poll_fd->revents = 0;
|
||
|
||
context = source->context;
|
||
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
|
||
source->priv->fds = g_slist_prepend (source->priv->fds, poll_fd);
|
||
|
||
if (context)
|
||
{
|
||
if (!SOURCE_BLOCKED (source))
|
||
g_main_context_add_poll_unlocked (context, source->priority, poll_fd);
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
return poll_fd;
|
||
}
|
||
|
||
/**
|
||
* g_source_modify_unix_fd:
|
||
* @source: a #GSource
|
||
* @tag: (not nullable): the tag from g_source_add_unix_fd()
|
||
* @new_events: the new event mask to watch
|
||
*
|
||
* Updates the event mask to watch for the fd identified by @tag.
|
||
*
|
||
* @tag is the tag returned from g_source_add_unix_fd().
|
||
*
|
||
* If you want to remove a fd, don't set its event mask to zero.
|
||
* Instead, call g_source_remove_unix_fd().
|
||
*
|
||
* This API is only intended to be used by implementations of #GSource.
|
||
* Do not call this API on a #GSource that you did not create.
|
||
*
|
||
* As the name suggests, this function is not available on Windows.
|
||
*
|
||
* Since: 2.36
|
||
**/
|
||
void
|
||
g_source_modify_unix_fd (GSource *source,
|
||
gpointer tag,
|
||
GIOCondition new_events)
|
||
{
|
||
GMainContext *context;
|
||
GPollFD *poll_fd;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
g_return_if_fail (g_slist_find (source->priv->fds, tag));
|
||
|
||
context = source->context;
|
||
poll_fd = tag;
|
||
|
||
poll_fd->events = new_events;
|
||
|
||
if (context)
|
||
g_main_context_wakeup (context);
|
||
}
|
||
|
||
/**
|
||
* g_source_remove_unix_fd:
|
||
* @source: a #GSource
|
||
* @tag: (not nullable): the tag from g_source_add_unix_fd()
|
||
*
|
||
* Reverses the effect of a previous call to g_source_add_unix_fd().
|
||
*
|
||
* You only need to call this if you want to remove an fd from being
|
||
* watched while keeping the same source around. In the normal case you
|
||
* will just want to destroy the source.
|
||
*
|
||
* This API is only intended to be used by implementations of #GSource.
|
||
* Do not call this API on a #GSource that you did not create.
|
||
*
|
||
* As the name suggests, this function is not available on Windows.
|
||
*
|
||
* Since: 2.36
|
||
**/
|
||
void
|
||
g_source_remove_unix_fd (GSource *source,
|
||
gpointer tag)
|
||
{
|
||
GMainContext *context;
|
||
GPollFD *poll_fd;
|
||
|
||
g_return_if_fail (source != NULL);
|
||
g_return_if_fail (g_slist_find (source->priv->fds, tag));
|
||
|
||
context = source->context;
|
||
poll_fd = tag;
|
||
|
||
if (context)
|
||
LOCK_CONTEXT (context);
|
||
|
||
source->priv->fds = g_slist_remove (source->priv->fds, poll_fd);
|
||
|
||
if (context)
|
||
{
|
||
if (!SOURCE_BLOCKED (source))
|
||
g_main_context_remove_poll_unlocked (context, poll_fd);
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
g_free (poll_fd);
|
||
}
|
||
|
||
/**
|
||
* g_source_query_unix_fd:
|
||
* @source: a #GSource
|
||
* @tag: (not nullable): the tag from g_source_add_unix_fd()
|
||
*
|
||
* Queries the events reported for the fd corresponding to @tag on
|
||
* @source during the last poll.
|
||
*
|
||
* The return value of this function is only defined when the function
|
||
* is called from the check or dispatch functions for @source.
|
||
*
|
||
* This API is only intended to be used by implementations of #GSource.
|
||
* Do not call this API on a #GSource that you did not create.
|
||
*
|
||
* As the name suggests, this function is not available on Windows.
|
||
*
|
||
* Returns: the conditions reported on the fd
|
||
*
|
||
* Since: 2.36
|
||
**/
|
||
GIOCondition
|
||
g_source_query_unix_fd (GSource *source,
|
||
gpointer tag)
|
||
{
|
||
GPollFD *poll_fd;
|
||
|
||
g_return_val_if_fail (source != NULL, 0);
|
||
g_return_val_if_fail (g_slist_find (source->priv->fds, tag), 0);
|
||
|
||
poll_fd = tag;
|
||
|
||
return poll_fd->revents;
|
||
}
|
||
#endif /* G_OS_UNIX */
|
||
|
||
/**
|
||
* g_get_current_time:
|
||
* @result: #GTimeVal structure in which to store current time.
|
||
*
|
||
* Equivalent to the UNIX gettimeofday() function, but portable.
|
||
*
|
||
* You may find g_get_real_time() to be more convenient.
|
||
*
|
||
* Deprecated: 2.62: #GTimeVal is not year-2038-safe. Use g_get_real_time()
|
||
* instead.
|
||
**/
|
||
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
|
||
void
|
||
g_get_current_time (GTimeVal *result)
|
||
{
|
||
gint64 tv;
|
||
|
||
g_return_if_fail (result != NULL);
|
||
|
||
tv = g_get_real_time ();
|
||
|
||
result->tv_sec = tv / 1000000;
|
||
result->tv_usec = tv % 1000000;
|
||
}
|
||
G_GNUC_END_IGNORE_DEPRECATIONS
|
||
|
||
/**
|
||
* g_get_real_time:
|
||
*
|
||
* Queries the system wall-clock time.
|
||
*
|
||
* This call is functionally equivalent to g_get_current_time() except
|
||
* that the return value is often more convenient than dealing with a
|
||
* #GTimeVal.
|
||
*
|
||
* You should only use this call if you are actually interested in the real
|
||
* wall-clock time. g_get_monotonic_time() is probably more useful for
|
||
* measuring intervals.
|
||
*
|
||
* Returns: the number of microseconds since January 1, 1970 UTC.
|
||
*
|
||
* Since: 2.28
|
||
**/
|
||
gint64
|
||
g_get_real_time (void)
|
||
{
|
||
#ifndef G_OS_WIN32
|
||
struct timeval r;
|
||
|
||
/* this is required on alpha, there the timeval structs are ints
|
||
* not longs and a cast only would fail horribly */
|
||
gettimeofday (&r, NULL);
|
||
|
||
return (((gint64) r.tv_sec) * 1000000) + r.tv_usec;
|
||
#else
|
||
FILETIME ft;
|
||
guint64 time64;
|
||
|
||
GetSystemTimeAsFileTime (&ft);
|
||
memmove (&time64, &ft, sizeof (FILETIME));
|
||
|
||
/* Convert from 100s of nanoseconds since 1601-01-01
|
||
* to Unix epoch. This is Y2038 safe.
|
||
*/
|
||
time64 -= G_GINT64_CONSTANT (116444736000000000);
|
||
time64 /= 10;
|
||
|
||
return time64;
|
||
#endif
|
||
}
|
||
|
||
/**
|
||
* g_get_monotonic_time:
|
||
*
|
||
* Queries the system monotonic time.
|
||
*
|
||
* The monotonic clock will always increase and doesn't suffer
|
||
* discontinuities when the user (or NTP) changes the system time. It
|
||
* may or may not continue to tick during times where the machine is
|
||
* suspended.
|
||
*
|
||
* We try to use the clock that corresponds as closely as possible to
|
||
* the passage of time as measured by system calls such as poll() but it
|
||
* may not always be possible to do this.
|
||
*
|
||
* Returns: the monotonic time, in microseconds
|
||
*
|
||
* Since: 2.28
|
||
**/
|
||
#if defined (G_OS_WIN32)
|
||
/* NOTE:
|
||
* time_usec = ticks_since_boot * usec_per_sec / ticks_per_sec
|
||
*
|
||
* Doing (ticks_since_boot * usec_per_sec) before the division can overflow 64 bits
|
||
* (ticks_since_boot / ticks_per_sec) and then multiply would not be accurate enough.
|
||
* So for now we calculate (usec_per_sec / ticks_per_sec) and use floating point
|
||
*/
|
||
static gdouble g_monotonic_usec_per_tick = 0;
|
||
|
||
void
|
||
g_clock_win32_init (void)
|
||
{
|
||
LARGE_INTEGER freq;
|
||
|
||
if (!QueryPerformanceFrequency (&freq) || freq.QuadPart == 0)
|
||
{
|
||
/* The documentation says that this should never happen */
|
||
g_assert_not_reached ();
|
||
return;
|
||
}
|
||
|
||
g_monotonic_usec_per_tick = (gdouble)G_USEC_PER_SEC / freq.QuadPart;
|
||
}
|
||
|
||
gint64
|
||
g_get_monotonic_time (void)
|
||
{
|
||
if (G_LIKELY (g_monotonic_usec_per_tick != 0))
|
||
{
|
||
LARGE_INTEGER ticks;
|
||
|
||
if (QueryPerformanceCounter (&ticks))
|
||
return (gint64)(ticks.QuadPart * g_monotonic_usec_per_tick);
|
||
|
||
g_warning ("QueryPerformanceCounter Failed (%lu)", GetLastError ());
|
||
g_monotonic_usec_per_tick = 0;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
#elif defined(HAVE_MACH_MACH_TIME_H) /* Mac OS */
|
||
gint64
|
||
g_get_monotonic_time (void)
|
||
{
|
||
static mach_timebase_info_data_t timebase_info;
|
||
|
||
if (timebase_info.denom == 0)
|
||
{
|
||
/* This is a fraction that we must use to scale
|
||
* mach_absolute_time() by in order to reach nanoseconds.
|
||
*
|
||
* We've only ever observed this to be 1/1, but maybe it could be
|
||
* 1000/1 if mach time is microseconds already, or 1/1000 if
|
||
* picoseconds. Try to deal nicely with that.
|
||
*/
|
||
mach_timebase_info (&timebase_info);
|
||
|
||
/* We actually want microseconds... */
|
||
if (timebase_info.numer % 1000 == 0)
|
||
timebase_info.numer /= 1000;
|
||
else
|
||
timebase_info.denom *= 1000;
|
||
|
||
/* We want to make the numer 1 to avoid having to multiply... */
|
||
if (timebase_info.denom % timebase_info.numer == 0)
|
||
{
|
||
timebase_info.denom /= timebase_info.numer;
|
||
timebase_info.numer = 1;
|
||
}
|
||
else
|
||
{
|
||
/* We could just multiply by timebase_info.numer below, but why
|
||
* bother for a case that may never actually exist...
|
||
*
|
||
* Plus -- performing the multiplication would risk integer
|
||
* overflow. If we ever actually end up in this situation, we
|
||
* should more carefully evaluate the correct course of action.
|
||
*/
|
||
mach_timebase_info (&timebase_info); /* Get a fresh copy for a better message */
|
||
g_error ("Got weird mach timebase info of %d/%d. Please file a bug against GLib.",
|
||
timebase_info.numer, timebase_info.denom);
|
||
}
|
||
}
|
||
|
||
return mach_absolute_time () / timebase_info.denom;
|
||
}
|
||
#else
|
||
gint64
|
||
g_get_monotonic_time (void)
|
||
{
|
||
struct timespec ts;
|
||
gint result;
|
||
|
||
result = clock_gettime (CLOCK_MONOTONIC, &ts);
|
||
|
||
if G_UNLIKELY (result != 0)
|
||
g_error ("GLib requires working CLOCK_MONOTONIC");
|
||
|
||
return (((gint64) ts.tv_sec) * 1000000) + (ts.tv_nsec / 1000);
|
||
}
|
||
#endif
|
||
|
||
static void
|
||
g_main_dispatch_free (gpointer dispatch)
|
||
{
|
||
g_free (dispatch);
|
||
}
|
||
|
||
/* Running the main loop */
|
||
|
||
static GMainDispatch *
|
||
get_dispatch (void)
|
||
{
|
||
static GPrivate depth_private = G_PRIVATE_INIT (g_main_dispatch_free);
|
||
GMainDispatch *dispatch;
|
||
|
||
dispatch = g_private_get (&depth_private);
|
||
|
||
if (!dispatch)
|
||
dispatch = g_private_set_alloc0 (&depth_private, sizeof (GMainDispatch));
|
||
|
||
return dispatch;
|
||
}
|
||
|
||
/**
|
||
* g_main_depth:
|
||
*
|
||
* Returns the depth of the stack of calls to
|
||
* g_main_context_dispatch() on any #GMainContext in the current thread.
|
||
* That is, when called from the toplevel, it gives 0. When
|
||
* called from within a callback from g_main_context_iteration()
|
||
* (or g_main_loop_run(), etc.) it returns 1. When called from within
|
||
* a callback to a recursive call to g_main_context_iteration(),
|
||
* it returns 2. And so forth.
|
||
*
|
||
* This function is useful in a situation like the following:
|
||
* Imagine an extremely simple "garbage collected" system.
|
||
*
|
||
* |[<!-- language="C" -->
|
||
* static GList *free_list;
|
||
*
|
||
* gpointer
|
||
* allocate_memory (gsize size)
|
||
* {
|
||
* gpointer result = g_malloc (size);
|
||
* free_list = g_list_prepend (free_list, result);
|
||
* return result;
|
||
* }
|
||
*
|
||
* void
|
||
* free_allocated_memory (void)
|
||
* {
|
||
* GList *l;
|
||
* for (l = free_list; l; l = l->next);
|
||
* g_free (l->data);
|
||
* g_list_free (free_list);
|
||
* free_list = NULL;
|
||
* }
|
||
*
|
||
* [...]
|
||
*
|
||
* while (TRUE);
|
||
* {
|
||
* g_main_context_iteration (NULL, TRUE);
|
||
* free_allocated_memory();
|
||
* }
|
||
* ]|
|
||
*
|
||
* This works from an application, however, if you want to do the same
|
||
* thing from a library, it gets more difficult, since you no longer
|
||
* control the main loop. You might think you can simply use an idle
|
||
* function to make the call to free_allocated_memory(), but that
|
||
* doesn't work, since the idle function could be called from a
|
||
* recursive callback. This can be fixed by using g_main_depth()
|
||
*
|
||
* |[<!-- language="C" -->
|
||
* gpointer
|
||
* allocate_memory (gsize size)
|
||
* {
|
||
* FreeListBlock *block = g_new (FreeListBlock, 1);
|
||
* block->mem = g_malloc (size);
|
||
* block->depth = g_main_depth ();
|
||
* free_list = g_list_prepend (free_list, block);
|
||
* return block->mem;
|
||
* }
|
||
*
|
||
* void
|
||
* free_allocated_memory (void)
|
||
* {
|
||
* GList *l;
|
||
*
|
||
* int depth = g_main_depth ();
|
||
* for (l = free_list; l; );
|
||
* {
|
||
* GList *next = l->next;
|
||
* FreeListBlock *block = l->data;
|
||
* if (block->depth > depth)
|
||
* {
|
||
* g_free (block->mem);
|
||
* g_free (block);
|
||
* free_list = g_list_delete_link (free_list, l);
|
||
* }
|
||
*
|
||
* l = next;
|
||
* }
|
||
* }
|
||
* ]|
|
||
*
|
||
* There is a temptation to use g_main_depth() to solve
|
||
* problems with reentrancy. For instance, while waiting for data
|
||
* to be received from the network in response to a menu item,
|
||
* the menu item might be selected again. It might seem that
|
||
* one could make the menu item's callback return immediately
|
||
* and do nothing if g_main_depth() returns a value greater than 1.
|
||
* However, this should be avoided since the user then sees selecting
|
||
* the menu item do nothing. Furthermore, you'll find yourself adding
|
||
* these checks all over your code, since there are doubtless many,
|
||
* many things that the user could do. Instead, you can use the
|
||
* following techniques:
|
||
*
|
||
* 1. Use gtk_widget_set_sensitive() or modal dialogs to prevent
|
||
* the user from interacting with elements while the main
|
||
* loop is recursing.
|
||
*
|
||
* 2. Avoid main loop recursion in situations where you can't handle
|
||
* arbitrary callbacks. Instead, structure your code so that you
|
||
* simply return to the main loop and then get called again when
|
||
* there is more work to do.
|
||
*
|
||
* Returns: The main loop recursion level in the current thread
|
||
*/
|
||
int
|
||
g_main_depth (void)
|
||
{
|
||
GMainDispatch *dispatch = get_dispatch ();
|
||
return dispatch->depth;
|
||
}
|
||
|
||
/**
|
||
* g_main_current_source:
|
||
*
|
||
* Returns the currently firing source for this thread.
|
||
*
|
||
* Returns: (transfer none): The currently firing source or %NULL.
|
||
*
|
||
* Since: 2.12
|
||
*/
|
||
GSource *
|
||
g_main_current_source (void)
|
||
{
|
||
GMainDispatch *dispatch = get_dispatch ();
|
||
return dispatch->source;
|
||
}
|
||
|
||
/**
|
||
* g_source_is_destroyed:
|
||
* @source: a #GSource
|
||
*
|
||
* Returns whether @source has been destroyed.
|
||
*
|
||
* This is important when you operate upon your objects
|
||
* from within idle handlers, but may have freed the object
|
||
* before the dispatch of your idle handler.
|
||
*
|
||
* |[<!-- language="C" -->
|
||
* static gboolean
|
||
* idle_callback (gpointer data)
|
||
* {
|
||
* SomeWidget *self = data;
|
||
*
|
||
* GDK_THREADS_ENTER ();
|
||
* // do stuff with self
|
||
* self->idle_id = 0;
|
||
* GDK_THREADS_LEAVE ();
|
||
*
|
||
* return G_SOURCE_REMOVE;
|
||
* }
|
||
*
|
||
* static void
|
||
* some_widget_do_stuff_later (SomeWidget *self)
|
||
* {
|
||
* self->idle_id = g_idle_add (idle_callback, self);
|
||
* }
|
||
*
|
||
* static void
|
||
* some_widget_finalize (GObject *object)
|
||
* {
|
||
* SomeWidget *self = SOME_WIDGET (object);
|
||
*
|
||
* if (self->idle_id)
|
||
* g_source_remove (self->idle_id);
|
||
*
|
||
* G_OBJECT_CLASS (parent_class)->finalize (object);
|
||
* }
|
||
* ]|
|
||
*
|
||
* This will fail in a multi-threaded application if the
|
||
* widget is destroyed before the idle handler fires due
|
||
* to the use after free in the callback. A solution, to
|
||
* this particular problem, is to check to if the source
|
||
* has already been destroy within the callback.
|
||
*
|
||
* |[<!-- language="C" -->
|
||
* static gboolean
|
||
* idle_callback (gpointer data)
|
||
* {
|
||
* SomeWidget *self = data;
|
||
*
|
||
* GDK_THREADS_ENTER ();
|
||
* if (!g_source_is_destroyed (g_main_current_source ()))
|
||
* {
|
||
* // do stuff with self
|
||
* }
|
||
* GDK_THREADS_LEAVE ();
|
||
*
|
||
* return FALSE;
|
||
* }
|
||
* ]|
|
||
*
|
||
* Calls to this function from a thread other than the one acquired by the
|
||
* #GMainContext the #GSource is attached to are typically redundant, as the
|
||
* source could be destroyed immediately after this function returns. However,
|
||
* once a source is destroyed it cannot be un-destroyed, so this function can be
|
||
* used for opportunistic checks from any thread.
|
||
*
|
||
* Returns: %TRUE if the source has been destroyed
|
||
*
|
||
* Since: 2.12
|
||
*/
|
||
gboolean
|
||
g_source_is_destroyed (GSource *source)
|
||
{
|
||
return SOURCE_DESTROYED (source);
|
||
}
|
||
|
||
/* Temporarily remove all this source's file descriptors from the
|
||
* poll(), so that if data comes available for one of the file descriptors
|
||
* we don't continually spin in the poll()
|
||
*/
|
||
/* HOLDS: source->context's lock */
|
||
static void
|
||
block_source (GSource *source)
|
||
{
|
||
GSList *tmp_list;
|
||
|
||
g_return_if_fail (!SOURCE_BLOCKED (source));
|
||
|
||
source->flags |= G_SOURCE_BLOCKED;
|
||
|
||
if (source->context)
|
||
{
|
||
tmp_list = source->poll_fds;
|
||
while (tmp_list)
|
||
{
|
||
g_main_context_remove_poll_unlocked (source->context, tmp_list->data);
|
||
tmp_list = tmp_list->next;
|
||
}
|
||
|
||
for (tmp_list = source->priv->fds; tmp_list; tmp_list = tmp_list->next)
|
||
g_main_context_remove_poll_unlocked (source->context, tmp_list->data);
|
||
}
|
||
|
||
if (source->priv && source->priv->child_sources)
|
||
{
|
||
tmp_list = source->priv->child_sources;
|
||
while (tmp_list)
|
||
{
|
||
block_source (tmp_list->data);
|
||
tmp_list = tmp_list->next;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* HOLDS: source->context's lock */
|
||
static void
|
||
unblock_source (GSource *source)
|
||
{
|
||
GSList *tmp_list;
|
||
|
||
g_return_if_fail (SOURCE_BLOCKED (source)); /* Source already unblocked */
|
||
g_return_if_fail (!SOURCE_DESTROYED (source));
|
||
|
||
source->flags &= ~G_SOURCE_BLOCKED;
|
||
|
||
tmp_list = source->poll_fds;
|
||
while (tmp_list)
|
||
{
|
||
g_main_context_add_poll_unlocked (source->context, source->priority, tmp_list->data);
|
||
tmp_list = tmp_list->next;
|
||
}
|
||
|
||
for (tmp_list = source->priv->fds; tmp_list; tmp_list = tmp_list->next)
|
||
g_main_context_add_poll_unlocked (source->context, source->priority, tmp_list->data);
|
||
|
||
if (source->priv && source->priv->child_sources)
|
||
{
|
||
tmp_list = source->priv->child_sources;
|
||
while (tmp_list)
|
||
{
|
||
unblock_source (tmp_list->data);
|
||
tmp_list = tmp_list->next;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* HOLDS: context's lock */
|
||
static void
|
||
g_main_dispatch (GMainContext *context)
|
||
{
|
||
GMainDispatch *current = get_dispatch ();
|
||
guint i;
|
||
|
||
for (i = 0; i < context->pending_dispatches->len; i++)
|
||
{
|
||
GSource *source = context->pending_dispatches->pdata[i];
|
||
|
||
context->pending_dispatches->pdata[i] = NULL;
|
||
g_assert (source);
|
||
|
||
source->flags &= ~G_SOURCE_READY;
|
||
|
||
if (!SOURCE_DESTROYED (source))
|
||
{
|
||
gboolean was_in_call;
|
||
gpointer user_data = NULL;
|
||
GSourceFunc callback = NULL;
|
||
GSourceCallbackFuncs *cb_funcs;
|
||
gpointer cb_data;
|
||
gboolean need_destroy;
|
||
|
||
gboolean (*dispatch) (GSource *,
|
||
GSourceFunc,
|
||
gpointer);
|
||
GSource *prev_source;
|
||
|
||
dispatch = source->source_funcs->dispatch;
|
||
cb_funcs = source->callback_funcs;
|
||
cb_data = source->callback_data;
|
||
|
||
if (cb_funcs)
|
||
cb_funcs->ref (cb_data);
|
||
|
||
if ((source->flags & G_SOURCE_CAN_RECURSE) == 0)
|
||
block_source (source);
|
||
|
||
was_in_call = source->flags & G_HOOK_FLAG_IN_CALL;
|
||
source->flags |= G_HOOK_FLAG_IN_CALL;
|
||
|
||
if (cb_funcs)
|
||
cb_funcs->get (cb_data, source, &callback, &user_data);
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
/* These operations are safe because 'current' is thread-local
|
||
* and not modified from anywhere but this function.
|
||
*/
|
||
prev_source = current->source;
|
||
current->source = source;
|
||
current->depth++;
|
||
|
||
TRACE (GLIB_MAIN_BEFORE_DISPATCH (g_source_get_name (source), source,
|
||
dispatch, callback, user_data));
|
||
need_destroy = !(* dispatch) (source, callback, user_data);
|
||
TRACE (GLIB_MAIN_AFTER_DISPATCH (g_source_get_name (source), source,
|
||
dispatch, need_destroy));
|
||
|
||
current->source = prev_source;
|
||
current->depth--;
|
||
|
||
if (cb_funcs)
|
||
cb_funcs->unref (cb_data);
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (!was_in_call)
|
||
source->flags &= ~G_HOOK_FLAG_IN_CALL;
|
||
|
||
if (SOURCE_BLOCKED (source) && !SOURCE_DESTROYED (source))
|
||
unblock_source (source);
|
||
|
||
/* Note: this depends on the fact that we can't switch
|
||
* sources from one main context to another
|
||
*/
|
||
if (need_destroy && !SOURCE_DESTROYED (source))
|
||
{
|
||
g_assert (source->context == context);
|
||
g_source_destroy_internal (source, context, TRUE);
|
||
}
|
||
}
|
||
|
||
g_source_unref_internal (source, context, TRUE);
|
||
}
|
||
|
||
g_ptr_array_set_size (context->pending_dispatches, 0);
|
||
}
|
||
|
||
/**
|
||
* g_main_context_acquire:
|
||
* @context: a #GMainContext
|
||
*
|
||
* Tries to become the owner of the specified context.
|
||
* If some other thread is the owner of the context,
|
||
* returns %FALSE immediately. Ownership is properly
|
||
* recursive: the owner can require ownership again
|
||
* and will release ownership when g_main_context_release()
|
||
* is called as many times as g_main_context_acquire().
|
||
*
|
||
* You must be the owner of a context before you
|
||
* can call g_main_context_prepare(), g_main_context_query(),
|
||
* g_main_context_check(), g_main_context_dispatch().
|
||
*
|
||
* Returns: %TRUE if the operation succeeded, and
|
||
* this thread is now the owner of @context.
|
||
**/
|
||
gboolean
|
||
g_main_context_acquire (GMainContext *context)
|
||
{
|
||
gboolean result = FALSE;
|
||
GThread *self = G_THREAD_SELF;
|
||
|
||
if (context == NULL)
|
||
context = g_main_context_default ();
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (!context->owner)
|
||
{
|
||
context->owner = self;
|
||
g_assert (context->owner_count == 0);
|
||
TRACE (GLIB_MAIN_CONTEXT_ACQUIRE (context, TRUE /* success */));
|
||
}
|
||
|
||
if (context->owner == self)
|
||
{
|
||
context->owner_count++;
|
||
result = TRUE;
|
||
}
|
||
else
|
||
{
|
||
TRACE (GLIB_MAIN_CONTEXT_ACQUIRE (context, FALSE /* failure */));
|
||
}
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return result;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_release:
|
||
* @context: a #GMainContext
|
||
*
|
||
* Releases ownership of a context previously acquired by this thread
|
||
* with g_main_context_acquire(). If the context was acquired multiple
|
||
* times, the ownership will be released only when g_main_context_release()
|
||
* is called as many times as it was acquired.
|
||
**/
|
||
void
|
||
g_main_context_release (GMainContext *context)
|
||
{
|
||
if (context == NULL)
|
||
context = g_main_context_default ();
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
context->owner_count--;
|
||
if (context->owner_count == 0)
|
||
{
|
||
TRACE (GLIB_MAIN_CONTEXT_RELEASE (context));
|
||
|
||
context->owner = NULL;
|
||
|
||
if (context->waiters)
|
||
{
|
||
GMainWaiter *waiter = context->waiters->data;
|
||
gboolean loop_internal_waiter = (waiter->mutex == &context->mutex);
|
||
context->waiters = g_slist_delete_link (context->waiters,
|
||
context->waiters);
|
||
if (!loop_internal_waiter)
|
||
g_mutex_lock (waiter->mutex);
|
||
|
||
g_cond_signal (waiter->cond);
|
||
|
||
if (!loop_internal_waiter)
|
||
g_mutex_unlock (waiter->mutex);
|
||
}
|
||
}
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
static gboolean
|
||
g_main_context_wait_internal (GMainContext *context,
|
||
GCond *cond,
|
||
GMutex *mutex)
|
||
{
|
||
gboolean result = FALSE;
|
||
GThread *self = G_THREAD_SELF;
|
||
gboolean loop_internal_waiter;
|
||
|
||
if (context == NULL)
|
||
context = g_main_context_default ();
|
||
|
||
loop_internal_waiter = (mutex == &context->mutex);
|
||
|
||
if (!loop_internal_waiter)
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (context->owner && context->owner != self)
|
||
{
|
||
GMainWaiter waiter;
|
||
|
||
waiter.cond = cond;
|
||
waiter.mutex = mutex;
|
||
|
||
context->waiters = g_slist_append (context->waiters, &waiter);
|
||
|
||
if (!loop_internal_waiter)
|
||
UNLOCK_CONTEXT (context);
|
||
g_cond_wait (cond, mutex);
|
||
if (!loop_internal_waiter)
|
||
LOCK_CONTEXT (context);
|
||
|
||
context->waiters = g_slist_remove (context->waiters, &waiter);
|
||
}
|
||
|
||
if (!context->owner)
|
||
{
|
||
context->owner = self;
|
||
g_assert (context->owner_count == 0);
|
||
}
|
||
|
||
if (context->owner == self)
|
||
{
|
||
context->owner_count++;
|
||
result = TRUE;
|
||
}
|
||
|
||
if (!loop_internal_waiter)
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return result;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_wait:
|
||
* @context: a #GMainContext
|
||
* @cond: a condition variable
|
||
* @mutex: a mutex, currently held
|
||
*
|
||
* Tries to become the owner of the specified context,
|
||
* as with g_main_context_acquire(). But if another thread
|
||
* is the owner, atomically drop @mutex and wait on @cond until
|
||
* that owner releases ownership or until @cond is signaled, then
|
||
* try again (once) to become the owner.
|
||
*
|
||
* Returns: %TRUE if the operation succeeded, and
|
||
* this thread is now the owner of @context.
|
||
* Deprecated: 2.58: Use g_main_context_is_owner() and separate locking instead.
|
||
*/
|
||
gboolean
|
||
g_main_context_wait (GMainContext *context,
|
||
GCond *cond,
|
||
GMutex *mutex)
|
||
{
|
||
if (context == NULL)
|
||
context = g_main_context_default ();
|
||
|
||
if (G_UNLIKELY (cond != &context->cond || mutex != &context->mutex))
|
||
{
|
||
static gboolean warned;
|
||
|
||
if (!warned)
|
||
{
|
||
g_critical ("WARNING!! g_main_context_wait() will be removed in a future release. "
|
||
"If you see this message, please file a bug immediately.");
|
||
warned = TRUE;
|
||
}
|
||
}
|
||
|
||
return g_main_context_wait_internal (context, cond, mutex);
|
||
}
|
||
|
||
/**
|
||
* g_main_context_prepare:
|
||
* @context: a #GMainContext
|
||
* @priority: (out) (optional): location to store priority of highest priority
|
||
* source already ready.
|
||
*
|
||
* Prepares to poll sources within a main loop. The resulting information
|
||
* for polling is determined by calling g_main_context_query ().
|
||
*
|
||
* You must have successfully acquired the context with
|
||
* g_main_context_acquire() before you may call this function.
|
||
*
|
||
* Returns: %TRUE if some source is ready to be dispatched
|
||
* prior to polling.
|
||
**/
|
||
gboolean
|
||
g_main_context_prepare (GMainContext *context,
|
||
gint *priority)
|
||
{
|
||
guint i;
|
||
gint n_ready = 0;
|
||
gint current_priority = G_MAXINT;
|
||
GSource *source;
|
||
GSourceIter iter;
|
||
|
||
if (context == NULL)
|
||
context = g_main_context_default ();
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
context->time_is_fresh = FALSE;
|
||
|
||
if (context->in_check_or_prepare)
|
||
{
|
||
g_warning ("g_main_context_prepare() called recursively from within a source's check() or "
|
||
"prepare() member.");
|
||
UNLOCK_CONTEXT (context);
|
||
return FALSE;
|
||
}
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_BEFORE_PREPARE (context));
|
||
|
||
#if 0
|
||
/* If recursing, finish up current dispatch, before starting over */
|
||
if (context->pending_dispatches)
|
||
{
|
||
if (dispatch)
|
||
g_main_dispatch (context, ¤t_time);
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
return TRUE;
|
||
}
|
||
#endif
|
||
|
||
/* If recursing, clear list of pending dispatches */
|
||
|
||
for (i = 0; i < context->pending_dispatches->len; i++)
|
||
{
|
||
if (context->pending_dispatches->pdata[i])
|
||
g_source_unref_internal ((GSource *)context->pending_dispatches->pdata[i], context, TRUE);
|
||
}
|
||
g_ptr_array_set_size (context->pending_dispatches, 0);
|
||
|
||
/* Prepare all sources */
|
||
|
||
context->timeout = -1;
|
||
|
||
g_source_iter_init (&iter, context, TRUE);
|
||
while (g_source_iter_next (&iter, &source))
|
||
{
|
||
gint source_timeout = -1;
|
||
|
||
if (SOURCE_DESTROYED (source) || SOURCE_BLOCKED (source))
|
||
continue;
|
||
if ((n_ready > 0) && (source->priority > current_priority))
|
||
break;
|
||
|
||
if (!(source->flags & G_SOURCE_READY))
|
||
{
|
||
gboolean result;
|
||
gboolean (* prepare) (GSource *source,
|
||
gint *timeout);
|
||
|
||
prepare = source->source_funcs->prepare;
|
||
|
||
if (prepare)
|
||
{
|
||
context->in_check_or_prepare++;
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
result = (* prepare) (source, &source_timeout);
|
||
TRACE (GLIB_MAIN_AFTER_PREPARE (source, prepare, source_timeout));
|
||
|
||
LOCK_CONTEXT (context);
|
||
context->in_check_or_prepare--;
|
||
}
|
||
else
|
||
{
|
||
source_timeout = -1;
|
||
result = FALSE;
|
||
}
|
||
|
||
if (result == FALSE && source->priv->ready_time != -1)
|
||
{
|
||
if (!context->time_is_fresh)
|
||
{
|
||
context->time = g_get_monotonic_time ();
|
||
context->time_is_fresh = TRUE;
|
||
}
|
||
|
||
if (source->priv->ready_time <= context->time)
|
||
{
|
||
source_timeout = 0;
|
||
result = TRUE;
|
||
}
|
||
else
|
||
{
|
||
gint64 timeout;
|
||
|
||
/* rounding down will lead to spinning, so always round up */
|
||
timeout = (source->priv->ready_time - context->time + 999) / 1000;
|
||
|
||
if (source_timeout < 0 || timeout < source_timeout)
|
||
source_timeout = MIN (timeout, G_MAXINT);
|
||
}
|
||
}
|
||
|
||
if (result)
|
||
{
|
||
GSource *ready_source = source;
|
||
|
||
while (ready_source)
|
||
{
|
||
ready_source->flags |= G_SOURCE_READY;
|
||
ready_source = ready_source->priv->parent_source;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (source->flags & G_SOURCE_READY)
|
||
{
|
||
n_ready++;
|
||
current_priority = source->priority;
|
||
context->timeout = 0;
|
||
}
|
||
|
||
if (source_timeout >= 0)
|
||
{
|
||
if (context->timeout < 0)
|
||
context->timeout = source_timeout;
|
||
else
|
||
context->timeout = MIN (context->timeout, source_timeout);
|
||
}
|
||
}
|
||
g_source_iter_clear (&iter);
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_AFTER_PREPARE (context, current_priority, n_ready));
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
if (priority)
|
||
*priority = current_priority;
|
||
|
||
return (n_ready > 0);
|
||
}
|
||
|
||
/**
|
||
* g_main_context_query:
|
||
* @context: a #GMainContext
|
||
* @max_priority: maximum priority source to check
|
||
* @timeout_: (out): location to store timeout to be used in polling
|
||
* @fds: (out caller-allocates) (array length=n_fds): location to
|
||
* store #GPollFD records that need to be polled.
|
||
* @n_fds: (in): length of @fds.
|
||
*
|
||
* Determines information necessary to poll this main loop.
|
||
*
|
||
* You must have successfully acquired the context with
|
||
* g_main_context_acquire() before you may call this function.
|
||
*
|
||
* Returns: the number of records actually stored in @fds,
|
||
* or, if more than @n_fds records need to be stored, the number
|
||
* of records that need to be stored.
|
||
**/
|
||
gint
|
||
g_main_context_query (GMainContext *context,
|
||
gint max_priority,
|
||
gint *timeout,
|
||
GPollFD *fds,
|
||
gint n_fds)
|
||
{
|
||
gint n_poll;
|
||
GPollRec *pollrec, *lastpollrec;
|
||
gushort events;
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_BEFORE_QUERY (context, max_priority));
|
||
|
||
n_poll = 0;
|
||
lastpollrec = NULL;
|
||
for (pollrec = context->poll_records; pollrec; pollrec = pollrec->next)
|
||
{
|
||
if (pollrec->priority > max_priority)
|
||
continue;
|
||
|
||
/* In direct contradiction to the Unix98 spec, IRIX runs into
|
||
* difficulty if you pass in POLLERR, POLLHUP or POLLNVAL
|
||
* flags in the events field of the pollfd while it should
|
||
* just ignoring them. So we mask them out here.
|
||
*/
|
||
events = pollrec->fd->events & ~(G_IO_ERR|G_IO_HUP|G_IO_NVAL);
|
||
|
||
if (lastpollrec && pollrec->fd->fd == lastpollrec->fd->fd)
|
||
{
|
||
if (n_poll - 1 < n_fds)
|
||
fds[n_poll - 1].events |= events;
|
||
}
|
||
else
|
||
{
|
||
if (n_poll < n_fds)
|
||
{
|
||
fds[n_poll].fd = pollrec->fd->fd;
|
||
fds[n_poll].events = events;
|
||
fds[n_poll].revents = 0;
|
||
}
|
||
|
||
n_poll++;
|
||
}
|
||
|
||
lastpollrec = pollrec;
|
||
}
|
||
|
||
context->poll_changed = FALSE;
|
||
|
||
if (timeout)
|
||
{
|
||
*timeout = context->timeout;
|
||
if (*timeout != 0)
|
||
context->time_is_fresh = FALSE;
|
||
}
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_AFTER_QUERY (context, context->timeout,
|
||
fds, n_poll));
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return n_poll;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_check:
|
||
* @context: a #GMainContext
|
||
* @max_priority: the maximum numerical priority of sources to check
|
||
* @fds: (array length=n_fds): array of #GPollFD's that was passed to
|
||
* the last call to g_main_context_query()
|
||
* @n_fds: return value of g_main_context_query()
|
||
*
|
||
* Passes the results of polling back to the main loop.
|
||
*
|
||
* You must have successfully acquired the context with
|
||
* g_main_context_acquire() before you may call this function.
|
||
*
|
||
* Returns: %TRUE if some sources are ready to be dispatched.
|
||
**/
|
||
gboolean
|
||
g_main_context_check (GMainContext *context,
|
||
gint max_priority,
|
||
GPollFD *fds,
|
||
gint n_fds)
|
||
{
|
||
GSource *source;
|
||
GSourceIter iter;
|
||
GPollRec *pollrec;
|
||
gint n_ready = 0;
|
||
gint i;
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (context->in_check_or_prepare)
|
||
{
|
||
g_warning ("g_main_context_check() called recursively from within a source's check() or "
|
||
"prepare() member.");
|
||
UNLOCK_CONTEXT (context);
|
||
return FALSE;
|
||
}
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_BEFORE_CHECK (context, max_priority, fds, n_fds));
|
||
|
||
for (i = 0; i < n_fds; i++)
|
||
{
|
||
if (fds[i].fd == context->wake_up_rec.fd)
|
||
{
|
||
if (fds[i].revents)
|
||
{
|
||
TRACE (GLIB_MAIN_CONTEXT_WAKEUP_ACKNOWLEDGE (context));
|
||
g_wakeup_acknowledge (context->wakeup);
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* If the set of poll file descriptors changed, bail out
|
||
* and let the main loop rerun
|
||
*/
|
||
if (context->poll_changed)
|
||
{
|
||
TRACE (GLIB_MAIN_CONTEXT_AFTER_CHECK (context, 0));
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
return FALSE;
|
||
}
|
||
|
||
pollrec = context->poll_records;
|
||
i = 0;
|
||
while (pollrec && i < n_fds)
|
||
{
|
||
while (pollrec && pollrec->fd->fd == fds[i].fd)
|
||
{
|
||
if (pollrec->priority <= max_priority)
|
||
{
|
||
pollrec->fd->revents =
|
||
fds[i].revents & (pollrec->fd->events | G_IO_ERR | G_IO_HUP | G_IO_NVAL);
|
||
}
|
||
pollrec = pollrec->next;
|
||
}
|
||
|
||
i++;
|
||
}
|
||
|
||
g_source_iter_init (&iter, context, TRUE);
|
||
while (g_source_iter_next (&iter, &source))
|
||
{
|
||
if (SOURCE_DESTROYED (source) || SOURCE_BLOCKED (source))
|
||
continue;
|
||
if ((n_ready > 0) && (source->priority > max_priority))
|
||
break;
|
||
|
||
if (!(source->flags & G_SOURCE_READY))
|
||
{
|
||
gboolean result;
|
||
gboolean (* check) (GSource *source);
|
||
|
||
check = source->source_funcs->check;
|
||
|
||
if (check)
|
||
{
|
||
/* If the check function is set, call it. */
|
||
context->in_check_or_prepare++;
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
result = (* check) (source);
|
||
|
||
TRACE (GLIB_MAIN_AFTER_CHECK (source, check, result));
|
||
|
||
LOCK_CONTEXT (context);
|
||
context->in_check_or_prepare--;
|
||
}
|
||
else
|
||
result = FALSE;
|
||
|
||
if (result == FALSE)
|
||
{
|
||
GSList *tmp_list;
|
||
|
||
/* If not already explicitly flagged ready by ->check()
|
||
* (or if we have no check) then we can still be ready if
|
||
* any of our fds poll as ready.
|
||
*/
|
||
for (tmp_list = source->priv->fds; tmp_list; tmp_list = tmp_list->next)
|
||
{
|
||
GPollFD *pollfd = tmp_list->data;
|
||
|
||
if (pollfd->revents)
|
||
{
|
||
result = TRUE;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (result == FALSE && source->priv->ready_time != -1)
|
||
{
|
||
if (!context->time_is_fresh)
|
||
{
|
||
context->time = g_get_monotonic_time ();
|
||
context->time_is_fresh = TRUE;
|
||
}
|
||
|
||
if (source->priv->ready_time <= context->time)
|
||
result = TRUE;
|
||
}
|
||
|
||
if (result)
|
||
{
|
||
GSource *ready_source = source;
|
||
|
||
while (ready_source)
|
||
{
|
||
ready_source->flags |= G_SOURCE_READY;
|
||
ready_source = ready_source->priv->parent_source;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (source->flags & G_SOURCE_READY)
|
||
{
|
||
g_source_ref (source);
|
||
g_ptr_array_add (context->pending_dispatches, source);
|
||
|
||
n_ready++;
|
||
|
||
/* never dispatch sources with less priority than the first
|
||
* one we choose to dispatch
|
||
*/
|
||
max_priority = source->priority;
|
||
}
|
||
}
|
||
g_source_iter_clear (&iter);
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_AFTER_CHECK (context, n_ready));
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return n_ready > 0;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_dispatch:
|
||
* @context: a #GMainContext
|
||
*
|
||
* Dispatches all pending sources.
|
||
*
|
||
* You must have successfully acquired the context with
|
||
* g_main_context_acquire() before you may call this function.
|
||
**/
|
||
void
|
||
g_main_context_dispatch (GMainContext *context)
|
||
{
|
||
LOCK_CONTEXT (context);
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_BEFORE_DISPATCH (context));
|
||
|
||
if (context->pending_dispatches->len > 0)
|
||
{
|
||
g_main_dispatch (context);
|
||
}
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_AFTER_DISPATCH (context));
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
/* HOLDS context lock */
|
||
static gboolean
|
||
g_main_context_iterate (GMainContext *context,
|
||
gboolean block,
|
||
gboolean dispatch,
|
||
GThread *self)
|
||
{
|
||
gint max_priority;
|
||
gint timeout;
|
||
gboolean some_ready;
|
||
gint nfds, allocated_nfds;
|
||
GPollFD *fds = NULL;
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
if (!g_main_context_acquire (context))
|
||
{
|
||
gboolean got_ownership;
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (!block)
|
||
return FALSE;
|
||
|
||
got_ownership = g_main_context_wait_internal (context,
|
||
&context->cond,
|
||
&context->mutex);
|
||
|
||
if (!got_ownership)
|
||
return FALSE;
|
||
}
|
||
else
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (!context->cached_poll_array)
|
||
{
|
||
context->cached_poll_array_size = context->n_poll_records;
|
||
context->cached_poll_array = g_new (GPollFD, context->n_poll_records);
|
||
}
|
||
|
||
allocated_nfds = context->cached_poll_array_size;
|
||
fds = context->cached_poll_array;
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
g_main_context_prepare (context, &max_priority);
|
||
|
||
while ((nfds = g_main_context_query (context, max_priority, &timeout, fds,
|
||
allocated_nfds)) > allocated_nfds)
|
||
{
|
||
LOCK_CONTEXT (context);
|
||
g_free (fds);
|
||
context->cached_poll_array_size = allocated_nfds = nfds;
|
||
context->cached_poll_array = fds = g_new (GPollFD, nfds);
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
if (!block)
|
||
timeout = 0;
|
||
|
||
g_main_context_poll (context, timeout, max_priority, fds, nfds);
|
||
|
||
some_ready = g_main_context_check (context, max_priority, fds, nfds);
|
||
|
||
if (dispatch)
|
||
g_main_context_dispatch (context);
|
||
|
||
g_main_context_release (context);
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
return some_ready;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_pending:
|
||
* @context: (nullable): a #GMainContext (if %NULL, the default context will be used)
|
||
*
|
||
* Checks if any sources have pending events for the given context.
|
||
*
|
||
* Returns: %TRUE if events are pending.
|
||
**/
|
||
gboolean
|
||
g_main_context_pending (GMainContext *context)
|
||
{
|
||
gboolean retval;
|
||
|
||
if (!context)
|
||
context = g_main_context_default();
|
||
|
||
LOCK_CONTEXT (context);
|
||
retval = g_main_context_iterate (context, FALSE, FALSE, G_THREAD_SELF);
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return retval;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_iteration:
|
||
* @context: (nullable): a #GMainContext (if %NULL, the default context will be used)
|
||
* @may_block: whether the call may block.
|
||
*
|
||
* Runs a single iteration for the given main loop. This involves
|
||
* checking to see if any event sources are ready to be processed,
|
||
* then if no events sources are ready and @may_block is %TRUE, waiting
|
||
* for a source to become ready, then dispatching the highest priority
|
||
* events sources that are ready. Otherwise, if @may_block is %FALSE
|
||
* sources are not waited to become ready, only those highest priority
|
||
* events sources will be dispatched (if any), that are ready at this
|
||
* given moment without further waiting.
|
||
*
|
||
* Note that even when @may_block is %TRUE, it is still possible for
|
||
* g_main_context_iteration() to return %FALSE, since the wait may
|
||
* be interrupted for other reasons than an event source becoming ready.
|
||
*
|
||
* Returns: %TRUE if events were dispatched.
|
||
**/
|
||
gboolean
|
||
g_main_context_iteration (GMainContext *context, gboolean may_block)
|
||
{
|
||
gboolean retval;
|
||
|
||
if (!context)
|
||
context = g_main_context_default();
|
||
|
||
LOCK_CONTEXT (context);
|
||
retval = g_main_context_iterate (context, may_block, TRUE, G_THREAD_SELF);
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return retval;
|
||
}
|
||
|
||
/**
|
||
* g_main_loop_new:
|
||
* @context: (nullable): a #GMainContext (if %NULL, the default context will be used).
|
||
* @is_running: set to %TRUE to indicate that the loop is running. This
|
||
* is not very important since calling g_main_loop_run() will set this to
|
||
* %TRUE anyway.
|
||
*
|
||
* Creates a new #GMainLoop structure.
|
||
*
|
||
* Returns: a new #GMainLoop.
|
||
**/
|
||
GMainLoop *
|
||
g_main_loop_new (GMainContext *context,
|
||
gboolean is_running)
|
||
{
|
||
GMainLoop *loop;
|
||
|
||
if (!context)
|
||
context = g_main_context_default();
|
||
|
||
g_main_context_ref (context);
|
||
|
||
loop = g_new0 (GMainLoop, 1);
|
||
loop->context = context;
|
||
loop->is_running = is_running != FALSE;
|
||
loop->ref_count = 1;
|
||
|
||
TRACE (GLIB_MAIN_LOOP_NEW (loop, context));
|
||
|
||
return loop;
|
||
}
|
||
|
||
/**
|
||
* g_main_loop_ref:
|
||
* @loop: a #GMainLoop
|
||
*
|
||
* Increases the reference count on a #GMainLoop object by one.
|
||
*
|
||
* Returns: @loop
|
||
**/
|
||
GMainLoop *
|
||
g_main_loop_ref (GMainLoop *loop)
|
||
{
|
||
g_return_val_if_fail (loop != NULL, NULL);
|
||
g_return_val_if_fail (g_atomic_int_get (&loop->ref_count) > 0, NULL);
|
||
|
||
g_atomic_int_inc (&loop->ref_count);
|
||
|
||
return loop;
|
||
}
|
||
|
||
/**
|
||
* g_main_loop_unref:
|
||
* @loop: a #GMainLoop
|
||
*
|
||
* Decreases the reference count on a #GMainLoop object by one. If
|
||
* the result is zero, free the loop and free all associated memory.
|
||
**/
|
||
void
|
||
g_main_loop_unref (GMainLoop *loop)
|
||
{
|
||
g_return_if_fail (loop != NULL);
|
||
g_return_if_fail (g_atomic_int_get (&loop->ref_count) > 0);
|
||
|
||
if (!g_atomic_int_dec_and_test (&loop->ref_count))
|
||
return;
|
||
|
||
g_main_context_unref (loop->context);
|
||
g_free (loop);
|
||
}
|
||
|
||
/**
|
||
* g_main_loop_run:
|
||
* @loop: a #GMainLoop
|
||
*
|
||
* Runs a main loop until g_main_loop_quit() is called on the loop.
|
||
* If this is called for the thread of the loop's #GMainContext,
|
||
* it will process events from the loop, otherwise it will
|
||
* simply wait.
|
||
**/
|
||
void
|
||
g_main_loop_run (GMainLoop *loop)
|
||
{
|
||
GThread *self = G_THREAD_SELF;
|
||
|
||
g_return_if_fail (loop != NULL);
|
||
g_return_if_fail (g_atomic_int_get (&loop->ref_count) > 0);
|
||
|
||
if (!g_main_context_acquire (loop->context))
|
||
{
|
||
gboolean got_ownership = FALSE;
|
||
|
||
/* Another thread owns this context */
|
||
LOCK_CONTEXT (loop->context);
|
||
|
||
g_atomic_int_inc (&loop->ref_count);
|
||
g_atomic_int_set (&loop->is_running, TRUE);
|
||
|
||
while (g_atomic_int_get (&loop->is_running) && !got_ownership)
|
||
got_ownership = g_main_context_wait_internal (loop->context,
|
||
&loop->context->cond,
|
||
&loop->context->mutex);
|
||
|
||
if (!g_atomic_int_get (&loop->is_running))
|
||
{
|
||
UNLOCK_CONTEXT (loop->context);
|
||
if (got_ownership)
|
||
g_main_context_release (loop->context);
|
||
g_main_loop_unref (loop);
|
||
return;
|
||
}
|
||
|
||
g_assert (got_ownership);
|
||
}
|
||
else
|
||
LOCK_CONTEXT (loop->context);
|
||
|
||
if (loop->context->in_check_or_prepare)
|
||
{
|
||
g_warning ("g_main_loop_run(): called recursively from within a source's "
|
||
"check() or prepare() member, iteration not possible.");
|
||
return;
|
||
}
|
||
|
||
g_atomic_int_inc (&loop->ref_count);
|
||
g_atomic_int_set (&loop->is_running, TRUE);
|
||
while (g_atomic_int_get (&loop->is_running))
|
||
g_main_context_iterate (loop->context, TRUE, TRUE, self);
|
||
|
||
UNLOCK_CONTEXT (loop->context);
|
||
|
||
g_main_context_release (loop->context);
|
||
|
||
g_main_loop_unref (loop);
|
||
}
|
||
|
||
/**
|
||
* g_main_loop_quit:
|
||
* @loop: a #GMainLoop
|
||
*
|
||
* Stops a #GMainLoop from running. Any calls to g_main_loop_run()
|
||
* for the loop will return.
|
||
*
|
||
* Note that sources that have already been dispatched when
|
||
* g_main_loop_quit() is called will still be executed.
|
||
**/
|
||
void
|
||
g_main_loop_quit (GMainLoop *loop)
|
||
{
|
||
g_return_if_fail (loop != NULL);
|
||
g_return_if_fail (g_atomic_int_get (&loop->ref_count) > 0);
|
||
|
||
LOCK_CONTEXT (loop->context);
|
||
g_atomic_int_set (&loop->is_running, FALSE);
|
||
g_wakeup_signal (loop->context->wakeup);
|
||
|
||
g_cond_broadcast (&loop->context->cond);
|
||
|
||
UNLOCK_CONTEXT (loop->context);
|
||
|
||
TRACE (GLIB_MAIN_LOOP_QUIT (loop));
|
||
}
|
||
|
||
/**
|
||
* g_main_loop_is_running:
|
||
* @loop: a #GMainLoop.
|
||
*
|
||
* Checks to see if the main loop is currently being run via g_main_loop_run().
|
||
*
|
||
* Returns: %TRUE if the mainloop is currently being run.
|
||
**/
|
||
gboolean
|
||
g_main_loop_is_running (GMainLoop *loop)
|
||
{
|
||
g_return_val_if_fail (loop != NULL, FALSE);
|
||
g_return_val_if_fail (g_atomic_int_get (&loop->ref_count) > 0, FALSE);
|
||
|
||
return g_atomic_int_get (&loop->is_running);
|
||
}
|
||
|
||
/**
|
||
* g_main_loop_get_context:
|
||
* @loop: a #GMainLoop.
|
||
*
|
||
* Returns the #GMainContext of @loop.
|
||
*
|
||
* Returns: (transfer none): the #GMainContext of @loop
|
||
**/
|
||
GMainContext *
|
||
g_main_loop_get_context (GMainLoop *loop)
|
||
{
|
||
g_return_val_if_fail (loop != NULL, NULL);
|
||
g_return_val_if_fail (g_atomic_int_get (&loop->ref_count) > 0, NULL);
|
||
|
||
return loop->context;
|
||
}
|
||
|
||
/* HOLDS: context's lock */
|
||
static void
|
||
g_main_context_poll (GMainContext *context,
|
||
gint timeout,
|
||
gint priority,
|
||
GPollFD *fds,
|
||
gint n_fds)
|
||
{
|
||
#ifdef G_MAIN_POLL_DEBUG
|
||
GTimer *poll_timer;
|
||
GPollRec *pollrec;
|
||
gint i;
|
||
#endif
|
||
|
||
GPollFunc poll_func;
|
||
|
||
if (n_fds || timeout != 0)
|
||
{
|
||
int ret, errsv;
|
||
|
||
#ifdef G_MAIN_POLL_DEBUG
|
||
poll_timer = NULL;
|
||
if (_g_main_poll_debug)
|
||
{
|
||
g_print ("polling context=%p n=%d timeout=%d\n",
|
||
context, n_fds, timeout);
|
||
poll_timer = g_timer_new ();
|
||
}
|
||
#endif
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
poll_func = context->poll_func;
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
ret = (*poll_func) (fds, n_fds, timeout);
|
||
errsv = errno;
|
||
if (ret < 0 && errsv != EINTR)
|
||
{
|
||
#ifndef G_OS_WIN32
|
||
g_warning ("poll(2) failed due to: %s.",
|
||
g_strerror (errsv));
|
||
#else
|
||
/* If g_poll () returns -1, it has already called g_warning() */
|
||
#endif
|
||
}
|
||
|
||
#ifdef G_MAIN_POLL_DEBUG
|
||
if (_g_main_poll_debug)
|
||
{
|
||
LOCK_CONTEXT (context);
|
||
|
||
g_print ("g_main_poll(%d) timeout: %d - elapsed %12.10f seconds",
|
||
n_fds,
|
||
timeout,
|
||
g_timer_elapsed (poll_timer, NULL));
|
||
g_timer_destroy (poll_timer);
|
||
pollrec = context->poll_records;
|
||
|
||
while (pollrec != NULL)
|
||
{
|
||
i = 0;
|
||
while (i < n_fds)
|
||
{
|
||
if (fds[i].fd == pollrec->fd->fd &&
|
||
pollrec->fd->events &&
|
||
fds[i].revents)
|
||
{
|
||
g_print (" [" G_POLLFD_FORMAT " :", fds[i].fd);
|
||
if (fds[i].revents & G_IO_IN)
|
||
g_print ("i");
|
||
if (fds[i].revents & G_IO_OUT)
|
||
g_print ("o");
|
||
if (fds[i].revents & G_IO_PRI)
|
||
g_print ("p");
|
||
if (fds[i].revents & G_IO_ERR)
|
||
g_print ("e");
|
||
if (fds[i].revents & G_IO_HUP)
|
||
g_print ("h");
|
||
if (fds[i].revents & G_IO_NVAL)
|
||
g_print ("n");
|
||
g_print ("]");
|
||
}
|
||
i++;
|
||
}
|
||
pollrec = pollrec->next;
|
||
}
|
||
g_print ("\n");
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
#endif
|
||
} /* if (n_fds || timeout != 0) */
|
||
}
|
||
|
||
/**
|
||
* g_main_context_add_poll:
|
||
* @context: (nullable): a #GMainContext (or %NULL for the default context)
|
||
* @fd: a #GPollFD structure holding information about a file
|
||
* descriptor to watch.
|
||
* @priority: the priority for this file descriptor which should be
|
||
* the same as the priority used for g_source_attach() to ensure that the
|
||
* file descriptor is polled whenever the results may be needed.
|
||
*
|
||
* Adds a file descriptor to the set of file descriptors polled for
|
||
* this context. This will very seldom be used directly. Instead
|
||
* a typical event source will use g_source_add_unix_fd() instead.
|
||
**/
|
||
void
|
||
g_main_context_add_poll (GMainContext *context,
|
||
GPollFD *fd,
|
||
gint priority)
|
||
{
|
||
if (!context)
|
||
context = g_main_context_default ();
|
||
|
||
g_return_if_fail (g_atomic_int_get (&context->ref_count) > 0);
|
||
g_return_if_fail (fd);
|
||
|
||
LOCK_CONTEXT (context);
|
||
g_main_context_add_poll_unlocked (context, priority, fd);
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
/* HOLDS: main_loop_lock */
|
||
static void
|
||
g_main_context_add_poll_unlocked (GMainContext *context,
|
||
gint priority,
|
||
GPollFD *fd)
|
||
{
|
||
GPollRec *prevrec, *nextrec;
|
||
GPollRec *newrec = g_slice_new (GPollRec);
|
||
|
||
/* This file descriptor may be checked before we ever poll */
|
||
fd->revents = 0;
|
||
newrec->fd = fd;
|
||
newrec->priority = priority;
|
||
|
||
prevrec = NULL;
|
||
nextrec = context->poll_records;
|
||
while (nextrec)
|
||
{
|
||
if (nextrec->fd->fd > fd->fd)
|
||
break;
|
||
prevrec = nextrec;
|
||
nextrec = nextrec->next;
|
||
}
|
||
|
||
if (prevrec)
|
||
prevrec->next = newrec;
|
||
else
|
||
context->poll_records = newrec;
|
||
|
||
newrec->prev = prevrec;
|
||
newrec->next = nextrec;
|
||
|
||
if (nextrec)
|
||
nextrec->prev = newrec;
|
||
|
||
context->n_poll_records++;
|
||
|
||
context->poll_changed = TRUE;
|
||
|
||
/* Now wake up the main loop if it is waiting in the poll() */
|
||
g_wakeup_signal (context->wakeup);
|
||
}
|
||
|
||
/**
|
||
* g_main_context_remove_poll:
|
||
* @context:a #GMainContext
|
||
* @fd: a #GPollFD descriptor previously added with g_main_context_add_poll()
|
||
*
|
||
* Removes file descriptor from the set of file descriptors to be
|
||
* polled for a particular context.
|
||
**/
|
||
void
|
||
g_main_context_remove_poll (GMainContext *context,
|
||
GPollFD *fd)
|
||
{
|
||
if (!context)
|
||
context = g_main_context_default ();
|
||
|
||
g_return_if_fail (g_atomic_int_get (&context->ref_count) > 0);
|
||
g_return_if_fail (fd);
|
||
|
||
LOCK_CONTEXT (context);
|
||
g_main_context_remove_poll_unlocked (context, fd);
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
static void
|
||
g_main_context_remove_poll_unlocked (GMainContext *context,
|
||
GPollFD *fd)
|
||
{
|
||
GPollRec *pollrec, *prevrec, *nextrec;
|
||
|
||
prevrec = NULL;
|
||
pollrec = context->poll_records;
|
||
|
||
while (pollrec)
|
||
{
|
||
nextrec = pollrec->next;
|
||
if (pollrec->fd == fd)
|
||
{
|
||
if (prevrec != NULL)
|
||
prevrec->next = nextrec;
|
||
else
|
||
context->poll_records = nextrec;
|
||
|
||
if (nextrec != NULL)
|
||
nextrec->prev = prevrec;
|
||
|
||
g_slice_free (GPollRec, pollrec);
|
||
|
||
context->n_poll_records--;
|
||
break;
|
||
}
|
||
prevrec = pollrec;
|
||
pollrec = nextrec;
|
||
}
|
||
|
||
context->poll_changed = TRUE;
|
||
|
||
/* Now wake up the main loop if it is waiting in the poll() */
|
||
g_wakeup_signal (context->wakeup);
|
||
}
|
||
|
||
/**
|
||
* g_source_get_current_time:
|
||
* @source: a #GSource
|
||
* @timeval: #GTimeVal structure in which to store current time.
|
||
*
|
||
* This function ignores @source and is otherwise the same as
|
||
* g_get_current_time().
|
||
*
|
||
* Deprecated: 2.28: use g_source_get_time() instead
|
||
**/
|
||
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
|
||
void
|
||
g_source_get_current_time (GSource *source,
|
||
GTimeVal *timeval)
|
||
{
|
||
g_get_current_time (timeval);
|
||
}
|
||
G_GNUC_END_IGNORE_DEPRECATIONS
|
||
|
||
/**
|
||
* g_source_get_time:
|
||
* @source: a #GSource
|
||
*
|
||
* Gets the time to be used when checking this source. The advantage of
|
||
* calling this function over calling g_get_monotonic_time() directly is
|
||
* that when checking multiple sources, GLib can cache a single value
|
||
* instead of having to repeatedly get the system monotonic time.
|
||
*
|
||
* The time here is the system monotonic time, if available, or some
|
||
* other reasonable alternative otherwise. See g_get_monotonic_time().
|
||
*
|
||
* Returns: the monotonic time in microseconds
|
||
*
|
||
* Since: 2.28
|
||
**/
|
||
gint64
|
||
g_source_get_time (GSource *source)
|
||
{
|
||
GMainContext *context;
|
||
gint64 result;
|
||
|
||
g_return_val_if_fail (source->context != NULL, 0);
|
||
|
||
context = source->context;
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (!context->time_is_fresh)
|
||
{
|
||
context->time = g_get_monotonic_time ();
|
||
context->time_is_fresh = TRUE;
|
||
}
|
||
|
||
result = context->time;
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return result;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_set_poll_func:
|
||
* @context: a #GMainContext
|
||
* @func: the function to call to poll all file descriptors
|
||
*
|
||
* Sets the function to use to handle polling of file descriptors. It
|
||
* will be used instead of the poll() system call
|
||
* (or GLib's replacement function, which is used where
|
||
* poll() isn't available).
|
||
*
|
||
* This function could possibly be used to integrate the GLib event
|
||
* loop with an external event loop.
|
||
**/
|
||
void
|
||
g_main_context_set_poll_func (GMainContext *context,
|
||
GPollFunc func)
|
||
{
|
||
if (!context)
|
||
context = g_main_context_default ();
|
||
|
||
g_return_if_fail (g_atomic_int_get (&context->ref_count) > 0);
|
||
|
||
LOCK_CONTEXT (context);
|
||
|
||
if (func)
|
||
context->poll_func = func;
|
||
else
|
||
context->poll_func = g_poll;
|
||
|
||
UNLOCK_CONTEXT (context);
|
||
}
|
||
|
||
/**
|
||
* g_main_context_get_poll_func:
|
||
* @context: a #GMainContext
|
||
*
|
||
* Gets the poll function set by g_main_context_set_poll_func().
|
||
*
|
||
* Returns: the poll function
|
||
**/
|
||
GPollFunc
|
||
g_main_context_get_poll_func (GMainContext *context)
|
||
{
|
||
GPollFunc result;
|
||
|
||
if (!context)
|
||
context = g_main_context_default ();
|
||
|
||
g_return_val_if_fail (g_atomic_int_get (&context->ref_count) > 0, NULL);
|
||
|
||
LOCK_CONTEXT (context);
|
||
result = context->poll_func;
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return result;
|
||
}
|
||
|
||
/**
|
||
* g_main_context_wakeup:
|
||
* @context: a #GMainContext
|
||
*
|
||
* If @context is currently blocking in g_main_context_iteration()
|
||
* waiting for a source to become ready, cause it to stop blocking
|
||
* and return. Otherwise, cause the next invocation of
|
||
* g_main_context_iteration() to return without blocking.
|
||
*
|
||
* This API is useful for low-level control over #GMainContext; for
|
||
* example, integrating it with main loop implementations such as
|
||
* #GMainLoop.
|
||
*
|
||
* Another related use for this function is when implementing a main
|
||
* loop with a termination condition, computed from multiple threads:
|
||
*
|
||
* |[<!-- language="C" -->
|
||
* #define NUM_TASKS 10
|
||
* static volatile gint tasks_remaining = NUM_TASKS;
|
||
* ...
|
||
*
|
||
* while (g_atomic_int_get (&tasks_remaining) != 0)
|
||
* g_main_context_iteration (NULL, TRUE);
|
||
* ]|
|
||
*
|
||
* Then in a thread:
|
||
* |[<!-- language="C" -->
|
||
* perform_work();
|
||
*
|
||
* if (g_atomic_int_dec_and_test (&tasks_remaining))
|
||
* g_main_context_wakeup (NULL);
|
||
* ]|
|
||
**/
|
||
void
|
||
g_main_context_wakeup (GMainContext *context)
|
||
{
|
||
if (!context)
|
||
context = g_main_context_default ();
|
||
|
||
g_return_if_fail (g_atomic_int_get (&context->ref_count) > 0);
|
||
|
||
TRACE (GLIB_MAIN_CONTEXT_WAKEUP (context));
|
||
|
||
g_wakeup_signal (context->wakeup);
|
||
}
|
||
|
||
/**
|
||
* g_main_context_is_owner:
|
||
* @context: a #GMainContext
|
||
*
|
||
* Determines whether this thread holds the (recursive)
|
||
* ownership of this #GMainContext. This is useful to
|
||
* know before waiting on another thread that may be
|
||
* blocking to get ownership of @context.
|
||
*
|
||
* Returns: %TRUE if current thread is owner of @context.
|
||
*
|
||
* Since: 2.10
|
||
**/
|
||
gboolean
|
||
g_main_context_is_owner (GMainContext *context)
|
||
{
|
||
gboolean is_owner;
|
||
|
||
if (!context)
|
||
context = g_main_context_default ();
|
||
|
||
LOCK_CONTEXT (context);
|
||
is_owner = context->owner == G_THREAD_SELF;
|
||
UNLOCK_CONTEXT (context);
|
||
|
||
return is_owner;
|
||
}
|
||
|
||
/* Timeouts */
|
||
|
||
static void
|
||
g_timeout_set_expiration (GTimeoutSource *timeout_source,
|
||
gint64 current_time)
|
||
{
|
||
gint64 expiration;
|
||
|
||
if (timeout_source->seconds)
|
||
{
|
||
gint64 remainder;
|
||
static gint timer_perturb = -1;
|
||
|
||
if (timer_perturb == -1)
|
||
{
|
||
/*
|
||
* we want a per machine/session unique 'random' value; try the dbus
|
||
* address first, that has a UUID in it. If there is no dbus, use the
|
||
* hostname for hashing.
|
||
*/
|
||
const char *session_bus_address = g_getenv ("DBUS_SESSION_BUS_ADDRESS");
|
||
if (!session_bus_address)
|
||
session_bus_address = g_getenv ("HOSTNAME");
|
||
if (session_bus_address)
|
||
timer_perturb = ABS ((gint) g_str_hash (session_bus_address)) % 1000000;
|
||
else
|
||
timer_perturb = 0;
|
||
}
|
||
|
||
expiration = current_time + (guint64) timeout_source->interval * 1000 * 1000;
|
||
|
||
/* We want the microseconds part of the timeout to land on the
|
||
* 'timer_perturb' mark, but we need to make sure we don't try to
|
||
* set the timeout in the past. We do this by ensuring that we
|
||
* always only *increase* the expiration time by adding a full
|
||
* second in the case that the microsecond portion decreases.
|
||
*/
|
||
expiration -= timer_perturb;
|
||
|
||
remainder = expiration % 1000000;
|
||
if (remainder >= 1000000/4)
|
||
expiration += 1000000;
|
||
|
||
expiration -= remainder;
|
||
expiration += timer_perturb;
|
||
}
|
||
else
|
||
{
|
||
expiration = current_time + (guint64) timeout_source->interval * 1000;
|
||
}
|
||
|
||
g_source_set_ready_time ((GSource *) timeout_source, expiration);
|
||
}
|
||
|
||
static gboolean
|
||
g_timeout_dispatch (GSource *source,
|
||
GSourceFunc callback,
|
||
gpointer user_data)
|
||
{
|
||
GTimeoutSource *timeout_source = (GTimeoutSource *)source;
|
||
gboolean again;
|
||
|
||
if (!callback)
|
||
{
|
||
g_warning ("Timeout source dispatched without callback. "
|
||
"You must call g_source_set_callback().");
|
||
return FALSE;
|
||
}
|
||
|
||
again = callback (user_data);
|
||
|
||
TRACE (GLIB_TIMEOUT_DISPATCH (source, source->context, callback, user_data, again));
|
||
|
||
if (again)
|
||
g_timeout_set_expiration (timeout_source, g_source_get_time (source));
|
||
|
||
return again;
|
||
}
|
||
|
||
/**
|
||
* g_timeout_source_new:
|
||
* @interval: the timeout interval in milliseconds.
|
||
*
|
||
* Creates a new timeout source.
|
||
*
|
||
* The source will not initially be associated with any #GMainContext
|
||
* and must be added to one with g_source_attach() before it will be
|
||
* executed.
|
||
*
|
||
* The interval given is in terms of monotonic time, not wall clock
|
||
* time. See g_get_monotonic_time().
|
||
*
|
||
* Returns: the newly-created timeout source
|
||
**/
|
||
GSource *
|
||
g_timeout_source_new (guint interval)
|
||
{
|
||
GSource *source = g_source_new (&g_timeout_funcs, sizeof (GTimeoutSource));
|
||
GTimeoutSource *timeout_source = (GTimeoutSource *)source;
|
||
|
||
timeout_source->interval = interval;
|
||
g_timeout_set_expiration (timeout_source, g_get_monotonic_time ());
|
||
|
||
return source;
|
||
}
|
||
|
||
/**
|
||
* g_timeout_source_new_seconds:
|
||
* @interval: the timeout interval in seconds
|
||
*
|
||
* Creates a new timeout source.
|
||
*
|
||
* The source will not initially be associated with any #GMainContext
|
||
* and must be added to one with g_source_attach() before it will be
|
||
* executed.
|
||
*
|
||
* The scheduling granularity/accuracy of this timeout source will be
|
||
* in seconds.
|
||
*
|
||
* The interval given is in terms of monotonic time, not wall clock time.
|
||
* See g_get_monotonic_time().
|
||
*
|
||
* Returns: the newly-created timeout source
|
||
*
|
||
* Since: 2.14
|
||
**/
|
||
GSource *
|
||
g_timeout_source_new_seconds (guint interval)
|
||
{
|
||
GSource *source = g_source_new (&g_timeout_funcs, sizeof (GTimeoutSource));
|
||
GTimeoutSource *timeout_source = (GTimeoutSource *)source;
|
||
|
||
timeout_source->interval = interval;
|
||
timeout_source->seconds = TRUE;
|
||
|
||
g_timeout_set_expiration (timeout_source, g_get_monotonic_time ());
|
||
|
||
return source;
|
||
}
|
||
|
||
|
||
/**
|
||
* g_timeout_add_full: (rename-to g_timeout_add)
|
||
* @priority: the priority of the timeout source. Typically this will be in
|
||
* the range between #G_PRIORITY_DEFAULT and #G_PRIORITY_HIGH.
|
||
* @interval: the time between calls to the function, in milliseconds
|
||
* (1/1000ths of a second)
|
||
* @function: function to call
|
||
* @data: data to pass to @function
|
||
* @notify: (nullable): function to call when the timeout is removed, or %NULL
|
||
*
|
||
* Sets a function to be called at regular intervals, with the given
|
||
* priority. The function is called repeatedly until it returns
|
||
* %FALSE, at which point the timeout is automatically destroyed and
|
||
* the function will not be called again. The @notify function is
|
||
* called when the timeout is destroyed. The first call to the
|
||
* function will be at the end of the first @interval.
|
||
*
|
||
* Note that timeout functions may be delayed, due to the processing of other
|
||
* event sources. Thus they should not be relied on for precise timing.
|
||
* After each call to the timeout function, the time of the next
|
||
* timeout is recalculated based on the current time and the given interval
|
||
* (it does not try to 'catch up' time lost in delays).
|
||
*
|
||
* See [memory management of sources][mainloop-memory-management] for details
|
||
* on how to handle the return value and memory management of @data.
|
||
*
|
||
* This internally creates a main loop source using g_timeout_source_new()
|
||
* and attaches it to the global #GMainContext using g_source_attach(), so
|
||
* the callback will be invoked in whichever thread is running that main
|
||
* context. You can do these steps manually if you need greater control or to
|
||
* use a custom main context.
|
||
*
|
||
* The interval given is in terms of monotonic time, not wall clock time.
|
||
* See g_get_monotonic_time().
|
||
*
|
||
* Returns: the ID (greater than 0) of the event source.
|
||
**/
|
||
guint
|
||
g_timeout_add_full (gint priority,
|
||
guint interval,
|
||
GSourceFunc function,
|
||
gpointer data,
|
||
GDestroyNotify notify)
|
||
{
|
||
GSource *source;
|
||
guint id;
|
||
|
||
g_return_val_if_fail (function != NULL, 0);
|
||
|
||
source = g_timeout_source_new (interval);
|
||
|
||
if (priority != G_PRIORITY_DEFAULT)
|
||
g_source_set_priority (source, priority);
|
||
|
||
g_source_set_callback (source, function, data, notify);
|
||
id = g_source_attach (source, NULL);
|
||
|
||
TRACE (GLIB_TIMEOUT_ADD (source, g_main_context_default (), id, priority, interval, function, data));
|
||
|
||
g_source_unref (source);
|
||
|
||
return id;
|
||
}
|
||
|
||
/**
|
||
* g_timeout_add:
|
||
* @interval: the time between calls to the function, in milliseconds
|
||
* (1/1000ths of a second)
|
||
* @function: function to call
|
||
* @data: data to pass to @function
|
||
*
|
||
* Sets a function to be called at regular intervals, with the default
|
||
* priority, #G_PRIORITY_DEFAULT. The function is called repeatedly
|
||
* until it returns %FALSE, at which point the timeout is automatically
|
||
* destroyed and the function will not be called again. The first call
|
||
* to the function will be at the end of the first @interval.
|
||
*
|
||
* Note that timeout functions may be delayed, due to the processing of other
|
||
* event sources. Thus they should not be relied on for precise timing.
|
||
* After each call to the timeout function, the time of the next
|
||
* timeout is recalculated based on the current time and the given interval
|
||
* (it does not try to 'catch up' time lost in delays).
|
||
*
|
||
* See [memory management of sources][mainloop-memory-management] for details
|
||
* on how to handle the return value and memory management of @data.
|
||
*
|
||
* If you want to have a timer in the "seconds" range and do not care
|
||
* about the exact time of the first call of the timer, use the
|
||
* g_timeout_add_seconds() function; this function allows for more
|
||
* optimizations and more efficient system power usage.
|
||
*
|
||
* This internally creates a main loop source using g_timeout_source_new()
|
||
* and attaches it to the global #GMainContext using g_source_attach(), so
|
||
* the callback will be invoked in whichever thread is running that main
|
||
* context. You can do these steps manually if you need greater control or to
|
||
* use a custom main context.
|
||
*
|
||
* The interval given is in terms of monotonic time, not wall clock
|
||
* time. See g_get_monotonic_time().
|
||
*
|
||
* Returns: the ID (greater than 0) of the event source.
|
||
**/
|
||
guint
|
||
g_timeout_add (guint32 interval,
|
||
GSourceFunc function,
|
||
gpointer data)
|
||
{
|
||
return g_timeout_add_full (G_PRIORITY_DEFAULT,
|
||
interval, function, data, NULL);
|
||
}
|
||
|
||
/**
|
||
* g_timeout_add_seconds_full: (rename-to g_timeout_add_seconds)
|
||
* @priority: the priority of the timeout source. Typically this will be in
|
||
* the range between #G_PRIORITY_DEFAULT and #G_PRIORITY_HIGH.
|
||
* @interval: the time between calls to the function, in seconds
|
||
* @function: function to call
|
||
* @data: data to pass to @function
|
||
* @notify: (nullable): function to call when the timeout is removed, or %NULL
|
||
*
|
||
* Sets a function to be called at regular intervals, with @priority.
|
||
* The function is called repeatedly until it returns %FALSE, at which
|
||
* point the timeout is automatically destroyed and the function will
|
||
* not be called again.
|
||
*
|
||
* Unlike g_timeout_add(), this function operates at whole second granularity.
|
||
* The initial starting point of the timer is determined by the implementation
|
||
* and the implementation is expected to group multiple timers together so that
|
||
* they fire all at the same time.
|
||
* To allow this grouping, the @interval to the first timer is rounded
|
||
* and can deviate up to one second from the specified interval.
|
||
* Subsequent timer iterations will generally run at the specified interval.
|
||
*
|
||
* Note that timeout functions may be delayed, due to the processing of other
|
||
* event sources. Thus they should not be relied on for precise timing.
|
||
* After each call to the timeout function, the time of the next
|
||
* timeout is recalculated based on the current time and the given @interval
|
||
*
|
||
* See [memory management of sources][mainloop-memory-management] for details
|
||
* on how to handle the return value and memory management of @data.
|
||
*
|
||
* If you want timing more precise than whole seconds, use g_timeout_add()
|
||
* instead.
|
||
*
|
||
* The grouping of timers to fire at the same time results in a more power
|
||
* and CPU efficient behavior so if your timer is in multiples of seconds
|
||
* and you don't require the first timer exactly one second from now, the
|
||
* use of g_timeout_add_seconds() is preferred over g_timeout_add().
|
||
*
|
||
* This internally creates a main loop source using
|
||
* g_timeout_source_new_seconds() and attaches it to the main loop context
|
||
* using g_source_attach(). You can do these steps manually if you need
|
||
* greater control.
|
||
*
|
||
* The interval given is in terms of monotonic time, not wall clock
|
||
* time. See g_get_monotonic_time().
|
||
*
|
||
* Returns: the ID (greater than 0) of the event source.
|
||
*
|
||
* Since: 2.14
|
||
**/
|
||
guint
|
||
g_timeout_add_seconds_full (gint priority,
|
||
guint32 interval,
|
||
GSourceFunc function,
|
||
gpointer data,
|
||
GDestroyNotify notify)
|
||
{
|
||
GSource *source;
|
||
guint id;
|
||
|
||
g_return_val_if_fail (function != NULL, 0);
|
||
|
||
source = g_timeout_source_new_seconds (interval);
|
||
|
||
if (priority != G_PRIORITY_DEFAULT)
|
||
g_source_set_priority (source, priority);
|
||
|
||
g_source_set_callback (source, function, data, notify);
|
||
id = g_source_attach (source, NULL);
|
||
g_source_unref (source);
|
||
|
||
return id;
|
||
}
|
||
|
||
/**
|
||
* g_timeout_add_seconds:
|
||
* @interval: the time between calls to the function, in seconds
|
||
* @function: function to call
|
||
* @data: data to pass to @function
|
||
*
|
||
* Sets a function to be called at regular intervals with the default
|
||
* priority, #G_PRIORITY_DEFAULT. The function is called repeatedly until
|
||
* it returns %FALSE, at which point the timeout is automatically destroyed
|
||
* and the function will not be called again.
|
||
*
|
||
* This internally creates a main loop source using
|
||
* g_timeout_source_new_seconds() and attaches it to the main loop context
|
||
* using g_source_attach(). You can do these steps manually if you need
|
||
* greater control. Also see g_timeout_add_seconds_full().
|
||
*
|
||
* Note that the first call of the timer may not be precise for timeouts
|
||
* of one second. If you need finer precision and have such a timeout,
|
||
* you may want to use g_timeout_add() instead.
|
||
*
|
||
* See [memory management of sources][mainloop-memory-management] for details
|
||
* on how to handle the return value and memory management of @data.
|
||
*
|
||
* The interval given is in terms of monotonic time, not wall clock
|
||
* time. See g_get_monotonic_time().
|
||
*
|
||
* Returns: the ID (greater than 0) of the event source.
|
||
*
|
||
* Since: 2.14
|
||
**/
|
||
guint
|
||
g_timeout_add_seconds (guint interval,
|
||
GSourceFunc function,
|
||
gpointer data)
|
||
{
|
||
g_return_val_if_fail (function != NULL, 0);
|
||
|
||
return g_timeout_add_seconds_full (G_PRIORITY_DEFAULT, interval, function, data, NULL);
|
||
}
|
||
|
||
/* Child watch functions */
|
||
|
||
#ifdef G_OS_WIN32
|
||
|
||
static gboolean
|
||
g_child_watch_prepare (GSource *source,
|
||
gint *timeout)
|
||
{
|
||
*timeout = -1;
|
||
return FALSE;
|
||
}
|
||
|
||
static gboolean
|
||
g_child_watch_check (GSource *source)
|
||
{
|
||
GChildWatchSource *child_watch_source;
|
||
gboolean child_exited;
|
||
|
||
child_watch_source = (GChildWatchSource *) source;
|
||
|
||
child_exited = child_watch_source->poll.revents & G_IO_IN;
|
||
|
||
if (child_exited)
|
||
{
|
||
DWORD child_status;
|
||
|
||
/*
|
||
* Note: We do _not_ check for the special value of STILL_ACTIVE
|
||
* since we know that the process has exited and doing so runs into
|
||
* problems if the child process "happens to return STILL_ACTIVE(259)"
|
||
* as Microsoft's Platform SDK puts it.
|
||
*/
|
||
if (!GetExitCodeProcess (child_watch_source->pid, &child_status))
|
||
{
|
||
gchar *emsg = g_win32_error_message (GetLastError ());
|
||
g_warning (G_STRLOC ": GetExitCodeProcess() failed: %s", emsg);
|
||
g_free (emsg);
|
||
|
||
child_watch_source->child_status = -1;
|
||
}
|
||
else
|
||
child_watch_source->child_status = child_status;
|
||
}
|
||
|
||
return child_exited;
|
||
}
|
||
|
||
static void
|
||
g_child_watch_finalize (GSource *source)
|
||
{
|
||
}
|
||
|
||
#else /* G_OS_WIN32 */
|
||
|
||
static void
|
||
wake_source (GSource *source)
|
||
{
|
||
GMainContext *context;
|
||
|
||
/* This should be thread-safe:
|
||
*
|
||
* - if the source is currently being added to a context, that
|
||
* context will be woken up anyway
|
||
*
|
||
* - if the source is currently being destroyed, we simply need not
|
||
* to crash:
|
||
*
|
||
* - the memory for the source will remain valid until after the
|
||
* source finalize function was called (which would remove the
|
||
* source from the global list which we are currently holding the
|
||
* lock for)
|
||
*
|
||
* - the GMainContext will either be NULL or point to a live
|
||
* GMainContext
|
||
*
|
||
* - the GMainContext will remain valid since we hold the
|
||
* main_context_list lock
|
||
*
|
||
* Since we are holding a lot of locks here, don't try to enter any
|
||
* more GMainContext functions for fear of dealock -- just hit the
|
||
* GWakeup and run. Even if that's safe now, it could easily become
|
||
* unsafe with some very minor changes in the future, and signal
|
||
* handling is not the most well-tested codepath.
|
||
*/
|
||
G_LOCK(main_context_list);
|
||
context = source->context;
|
||
if (context)
|
||
g_wakeup_signal (context->wakeup);
|
||
G_UNLOCK(main_context_list);
|
||
}
|
||
|
||
static void
|
||
dispatch_unix_signals_unlocked (void)
|
||
{
|
||
gboolean pending[NSIG];
|
||
GSList *node;
|
||
gint i;
|
||
|
||
/* clear this first in case another one arrives while we're processing */
|
||
any_unix_signal_pending = FALSE;
|
||
|
||
/* We atomically test/clear the bit from the global array in case
|
||
* other signals arrive while we are dispatching.
|
||
*
|
||
* We then can safely use our own array below without worrying about
|
||
* races.
|
||
*/
|
||
for (i = 0; i < NSIG; i++)
|
||
{
|
||
/* Be very careful with (the volatile) unix_signal_pending.
|
||
*
|
||
* We must ensure that it's not possible that we clear it without
|
||
* handling the signal. We therefore must ensure that our pending
|
||
* array has a field set (ie: we will do something about the
|
||
* signal) before we clear the item in unix_signal_pending.
|
||
*
|
||
* Note specifically: we must check _our_ array.
|
||
*/
|
||
pending[i] = unix_signal_pending[i];
|
||
if (pending[i])
|
||
unix_signal_pending[i] = FALSE;
|
||
}
|
||
|
||
/* handle GChildWatchSource instances */
|
||
if (pending[SIGCHLD])
|
||
{
|
||
/* The only way we can do this is to scan all of the children.
|
||
*
|
||
* The docs promise that we will not reap children that we are not
|
||
* explicitly watching, so that ties our hands from calling
|
||
* waitpid(-1). We also can't use siginfo's si_pid field since if
|
||
* multiple SIGCHLD arrive at the same time, one of them can be
|
||
* dropped (since a given UNIX signal can only be pending once).
|
||
*/
|
||
for (node = unix_child_watches; node; node = node->next)
|
||
{
|
||
GChildWatchSource *source = node->data;
|
||
|
||
if (!g_atomic_int_get (&source->child_exited))
|
||
{
|
||
pid_t pid;
|
||
do
|
||
{
|
||
g_assert (source->pid > 0);
|
||
|
||
pid = waitpid (source->pid, &source->child_status, WNOHANG);
|
||
if (pid > 0)
|
||
{
|
||
g_atomic_int_set (&source->child_exited, TRUE);
|
||
wake_source ((GSource *) source);
|
||
}
|
||
else if (pid == -1 && errno == ECHILD)
|
||
{
|
||
g_warning ("GChildWatchSource: Exit status of a child process was requested but ECHILD was received by waitpid(). See the documentation of g_child_watch_source_new() for possible causes.");
|
||
source->child_status = 0;
|
||
g_atomic_int_set (&source->child_exited, TRUE);
|
||
wake_source ((GSource *) source);
|
||
}
|
||
}
|
||
while (pid == -1 && errno == EINTR);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* handle GUnixSignalWatchSource instances */
|
||
for (node = unix_signal_watches; node; node = node->next)
|
||
{
|
||
GUnixSignalWatchSource *source = node->data;
|
||
|
||
if (pending[source->signum] &&
|
||
g_atomic_int_compare_and_exchange (&source->pending, FALSE, TRUE))
|
||
{
|
||
wake_source ((GSource *) source);
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
static void
|
||
dispatch_unix_signals (void)
|
||
{
|
||
G_LOCK(unix_signal_lock);
|
||
dispatch_unix_signals_unlocked ();
|
||
G_UNLOCK(unix_signal_lock);
|
||
}
|
||
|
||
static gboolean
|
||
g_child_watch_prepare (GSource *source,
|
||
gint *timeout)
|
||
{
|
||
GChildWatchSource *child_watch_source;
|
||
|
||
child_watch_source = (GChildWatchSource *) source;
|
||
|
||
return g_atomic_int_get (&child_watch_source->child_exited);
|
||
}
|
||
|
||
static gboolean
|
||
g_child_watch_check (GSource *source)
|
||
{
|
||
GChildWatchSource *child_watch_source;
|
||
|
||
child_watch_source = (GChildWatchSource *) source;
|
||
|
||
return g_atomic_int_get (&child_watch_source->child_exited);
|
||
}
|
||
|
||
static gboolean
|
||
g_unix_signal_watch_prepare (GSource *source,
|
||
gint *timeout)
|
||
{
|
||
GUnixSignalWatchSource *unix_signal_source;
|
||
|
||
unix_signal_source = (GUnixSignalWatchSource *) source;
|
||
|
||
return g_atomic_int_get (&unix_signal_source->pending);
|
||
}
|
||
|
||
static gboolean
|
||
g_unix_signal_watch_check (GSource *source)
|
||
{
|
||
GUnixSignalWatchSource *unix_signal_source;
|
||
|
||
unix_signal_source = (GUnixSignalWatchSource *) source;
|
||
|
||
return g_atomic_int_get (&unix_signal_source->pending);
|
||
}
|
||
|
||
static gboolean
|
||
g_unix_signal_watch_dispatch (GSource *source,
|
||
GSourceFunc callback,
|
||
gpointer user_data)
|
||
{
|
||
GUnixSignalWatchSource *unix_signal_source;
|
||
gboolean again;
|
||
|
||
unix_signal_source = (GUnixSignalWatchSource *) source;
|
||
|
||
if (!callback)
|
||
{
|
||
g_warning ("Unix signal source dispatched without callback. "
|
||
"You must call g_source_set_callback().");
|
||
return FALSE;
|
||
}
|
||
|
||
g_atomic_int_set (&unix_signal_source->pending, FALSE);
|
||
|
||
again = (callback) (user_data);
|
||
|
||
return again;
|
||
}
|
||
|
||
static void
|
||
ref_unix_signal_handler_unlocked (int signum)
|
||
{
|
||
/* Ensure we have the worker context */
|
||
g_get_worker_context ();
|
||
unix_signal_refcount[signum]++;
|
||
if (unix_signal_refcount[signum] == 1)
|
||
{
|
||
struct sigaction action;
|
||
action.sa_handler = g_unix_signal_handler;
|
||
sigemptyset (&action.sa_mask);
|
||
#ifdef SA_RESTART
|
||
action.sa_flags = SA_RESTART | SA_NOCLDSTOP;
|
||
#else
|
||
action.sa_flags = SA_NOCLDSTOP;
|
||
#endif
|
||
sigaction (signum, &action, NULL);
|
||
}
|
||
}
|
||
|
||
static void
|
||
unref_unix_signal_handler_unlocked (int signum)
|
||
{
|
||
unix_signal_refcount[signum]--;
|
||
if (unix_signal_refcount[signum] == 0)
|
||
{
|
||
struct sigaction action;
|
||
memset (&action, 0, sizeof (action));
|
||
action.sa_handler = SIG_DFL;
|
||
sigemptyset (&action.sa_mask);
|
||
sigaction (signum, &action, NULL);
|
||
}
|
||
}
|
||
|
||
/* Return a const string to avoid allocations. We lose precision in the case the
|
||
* @signum is unrecognised, but that’ll do. */
|
||
static const gchar *
|
||
signum_to_string (int signum)
|
||
{
|
||
/* See `man 0P signal.h` */
|
||
#define SIGNAL(s) \
|
||
case (s): \
|
||
return ("GUnixSignalSource: " #s);
|
||
switch (signum)
|
||
{
|
||
/* These signals are guaranteed to exist by POSIX. */
|
||
SIGNAL (SIGABRT)
|
||
SIGNAL (SIGFPE)
|
||
SIGNAL (SIGILL)
|
||
SIGNAL (SIGINT)
|
||
SIGNAL (SIGSEGV)
|
||
SIGNAL (SIGTERM)
|
||
/* Frustratingly, these are not, and hence for brevity the list is
|
||
* incomplete. */
|
||
#ifdef SIGALRM
|
||
SIGNAL (SIGALRM)
|
||
#endif
|
||
#ifdef SIGCHLD
|
||
SIGNAL (SIGCHLD)
|
||
#endif
|
||
#ifdef SIGHUP
|
||
SIGNAL (SIGHUP)
|
||
#endif
|
||
#ifdef SIGKILL
|
||
SIGNAL (SIGKILL)
|
||
#endif
|
||
#ifdef SIGPIPE
|
||
SIGNAL (SIGPIPE)
|
||
#endif
|
||
#ifdef SIGQUIT
|
||
SIGNAL (SIGQUIT)
|
||
#endif
|
||
#ifdef SIGSTOP
|
||
SIGNAL (SIGSTOP)
|
||
#endif
|
||
#ifdef SIGUSR1
|
||
SIGNAL (SIGUSR1)
|
||
#endif
|
||
#ifdef SIGUSR2
|
||
SIGNAL (SIGUSR2)
|
||
#endif
|
||
#ifdef SIGPOLL
|
||
SIGNAL (SIGPOLL)
|
||
#endif
|
||
#ifdef SIGPROF
|
||
SIGNAL (SIGPROF)
|
||
#endif
|
||
#ifdef SIGTRAP
|
||
SIGNAL (SIGTRAP)
|
||
#endif
|
||
default:
|
||
return "GUnixSignalSource: Unrecognized signal";
|
||
}
|
||
#undef SIGNAL
|
||
}
|
||
|
||
GSource *
|
||
_g_main_create_unix_signal_watch (int signum)
|
||
{
|
||
GSource *source;
|
||
GUnixSignalWatchSource *unix_signal_source;
|
||
|
||
source = g_source_new (&g_unix_signal_funcs, sizeof (GUnixSignalWatchSource));
|
||
unix_signal_source = (GUnixSignalWatchSource *) source;
|
||
|
||
unix_signal_source->signum = signum;
|
||
unix_signal_source->pending = FALSE;
|
||
|
||
/* Set a default name on the source, just in case the caller does not. */
|
||
g_source_set_name (source, signum_to_string (signum));
|
||
|
||
G_LOCK (unix_signal_lock);
|
||
ref_unix_signal_handler_unlocked (signum);
|
||
unix_signal_watches = g_slist_prepend (unix_signal_watches, unix_signal_source);
|
||
dispatch_unix_signals_unlocked ();
|
||
G_UNLOCK (unix_signal_lock);
|
||
|
||
return source;
|
||
}
|
||
|
||
static void
|
||
g_unix_signal_watch_finalize (GSource *source)
|
||
{
|
||
GUnixSignalWatchSource *unix_signal_source;
|
||
|
||
unix_signal_source = (GUnixSignalWatchSource *) source;
|
||
|
||
G_LOCK (unix_signal_lock);
|
||
unref_unix_signal_handler_unlocked (unix_signal_source->signum);
|
||
unix_signal_watches = g_slist_remove (unix_signal_watches, source);
|
||
G_UNLOCK (unix_signal_lock);
|
||
}
|
||
|
||
static void
|
||
g_child_watch_finalize (GSource *source)
|
||
{
|
||
G_LOCK (unix_signal_lock);
|
||
unix_child_watches = g_slist_remove (unix_child_watches, source);
|
||
unref_unix_signal_handler_unlocked (SIGCHLD);
|
||
G_UNLOCK (unix_signal_lock);
|
||
}
|
||
|
||
#endif /* G_OS_WIN32 */
|
||
|
||
static gboolean
|
||
g_child_watch_dispatch (GSource *source,
|
||
GSourceFunc callback,
|
||
gpointer user_data)
|
||
{
|
||
GChildWatchSource *child_watch_source;
|
||
GChildWatchFunc child_watch_callback = (GChildWatchFunc) callback;
|
||
|
||
child_watch_source = (GChildWatchSource *) source;
|
||
|
||
if (!callback)
|
||
{
|
||
g_warning ("Child watch source dispatched without callback. "
|
||
"You must call g_source_set_callback().");
|
||
return FALSE;
|
||
}
|
||
|
||
(child_watch_callback) (child_watch_source->pid, child_watch_source->child_status, user_data);
|
||
|
||
/* We never keep a child watch source around as the child is gone */
|
||
return FALSE;
|
||
}
|
||
|
||
#ifndef G_OS_WIN32
|
||
|
||
static void
|
||
g_unix_signal_handler (int signum)
|
||
{
|
||
gint saved_errno = errno;
|
||
|
||
unix_signal_pending[signum] = TRUE;
|
||
any_unix_signal_pending = TRUE;
|
||
|
||
g_wakeup_signal (glib_worker_context->wakeup);
|
||
|
||
errno = saved_errno;
|
||
}
|
||
|
||
#endif /* !G_OS_WIN32 */
|
||
|
||
/**
|
||
* g_child_watch_source_new:
|
||
* @pid: process to watch. On POSIX the positive pid of a child process. On
|
||
* Windows a handle for a process (which doesn't have to be a child).
|
||
*
|
||
* Creates a new child_watch source.
|
||
*
|
||
* The source will not initially be associated with any #GMainContext
|
||
* and must be added to one with g_source_attach() before it will be
|
||
* executed.
|
||
*
|
||
* Note that child watch sources can only be used in conjunction with
|
||
* `g_spawn...` when the %G_SPAWN_DO_NOT_REAP_CHILD flag is used.
|
||
*
|
||
* Note that on platforms where #GPid must be explicitly closed
|
||
* (see g_spawn_close_pid()) @pid must not be closed while the
|
||
* source is still active. Typically, you will want to call
|
||
* g_spawn_close_pid() in the callback function for the source.
|
||
*
|
||
* On POSIX platforms, the following restrictions apply to this API
|
||
* due to limitations in POSIX process interfaces:
|
||
*
|
||
* * @pid must be a child of this process
|
||
* * @pid must be positive
|
||
* * the application must not call `waitpid` with a non-positive
|
||
* first argument, for instance in another thread
|
||
* * the application must not wait for @pid to exit by any other
|
||
* mechanism, including `waitpid(pid, ...)` or a second child-watch
|
||
* source for the same @pid
|
||
* * the application must not ignore SIGCHILD
|
||
*
|
||
* If any of those conditions are not met, this and related APIs will
|
||
* not work correctly. This can often be diagnosed via a GLib warning
|
||
* stating that `ECHILD` was received by `waitpid`.
|
||
*
|
||
* Calling `waitpid` for specific processes other than @pid remains a
|
||
* valid thing to do.
|
||
*
|
||
* Returns: the newly-created child watch source
|
||
*
|
||
* Since: 2.4
|
||
**/
|
||
GSource *
|
||
g_child_watch_source_new (GPid pid)
|
||
{
|
||
GSource *source;
|
||
GChildWatchSource *child_watch_source;
|
||
|
||
#ifndef G_OS_WIN32
|
||
g_return_val_if_fail (pid > 0, NULL);
|
||
#endif
|
||
|
||
source = g_source_new (&g_child_watch_funcs, sizeof (GChildWatchSource));
|
||
child_watch_source = (GChildWatchSource *)source;
|
||
|
||
/* Set a default name on the source, just in case the caller does not. */
|
||
g_source_set_name (source, "GChildWatchSource");
|
||
|
||
child_watch_source->pid = pid;
|
||
|
||
#ifdef G_OS_WIN32
|
||
child_watch_source->poll.fd = (gintptr) pid;
|
||
child_watch_source->poll.events = G_IO_IN;
|
||
|
||
g_source_add_poll (source, &child_watch_source->poll);
|
||
#else /* G_OS_WIN32 */
|
||
G_LOCK (unix_signal_lock);
|
||
ref_unix_signal_handler_unlocked (SIGCHLD);
|
||
unix_child_watches = g_slist_prepend (unix_child_watches, child_watch_source);
|
||
if (waitpid (pid, &child_watch_source->child_status, WNOHANG) > 0)
|
||
child_watch_source->child_exited = TRUE;
|
||
G_UNLOCK (unix_signal_lock);
|
||
#endif /* G_OS_WIN32 */
|
||
|
||
return source;
|
||
}
|
||
|
||
/**
|
||
* g_child_watch_add_full: (rename-to g_child_watch_add)
|
||
* @priority: the priority of the idle source. Typically this will be in the
|
||
* range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE.
|
||
* @pid: process to watch. On POSIX the positive pid of a child process. On
|
||
* Windows a handle for a process (which doesn't have to be a child).
|
||
* @function: function to call
|
||
* @data: data to pass to @function
|
||
* @notify: (nullable): function to call when the idle is removed, or %NULL
|
||
*
|
||
* Sets a function to be called when the child indicated by @pid
|
||
* exits, at the priority @priority.
|
||
*
|
||
* If you obtain @pid from g_spawn_async() or g_spawn_async_with_pipes()
|
||
* you will need to pass #G_SPAWN_DO_NOT_REAP_CHILD as flag to
|
||
* the spawn function for the child watching to work.
|
||
*
|
||
* In many programs, you will want to call g_spawn_check_exit_status()
|
||
* in the callback to determine whether or not the child exited
|
||
* successfully.
|
||
*
|
||
* Also, note that on platforms where #GPid must be explicitly closed
|
||
* (see g_spawn_close_pid()) @pid must not be closed while the source
|
||
* is still active. Typically, you should invoke g_spawn_close_pid()
|
||
* in the callback function for the source.
|
||
*
|
||
* GLib supports only a single callback per process id.
|
||
* On POSIX platforms, the same restrictions mentioned for
|
||
* g_child_watch_source_new() apply to this function.
|
||
*
|
||
* This internally creates a main loop source using
|
||
* g_child_watch_source_new() and attaches it to the main loop context
|
||
* using g_source_attach(). You can do these steps manually if you
|
||
* need greater control.
|
||
*
|
||
* Returns: the ID (greater than 0) of the event source.
|
||
*
|
||
* Since: 2.4
|
||
**/
|
||
guint
|
||
g_child_watch_add_full (gint priority,
|
||
GPid pid,
|
||
GChildWatchFunc function,
|
||
gpointer data,
|
||
GDestroyNotify notify)
|
||
{
|
||
GSource *source;
|
||
guint id;
|
||
|
||
g_return_val_if_fail (function != NULL, 0);
|
||
#ifndef G_OS_WIN32
|
||
g_return_val_if_fail (pid > 0, 0);
|
||
#endif
|
||
|
||
source = g_child_watch_source_new (pid);
|
||
|
||
if (priority != G_PRIORITY_DEFAULT)
|
||
g_source_set_priority (source, priority);
|
||
|
||
g_source_set_callback (source, (GSourceFunc) function, data, notify);
|
||
id = g_source_attach (source, NULL);
|
||
g_source_unref (source);
|
||
|
||
return id;
|
||
}
|
||
|
||
/**
|
||
* g_child_watch_add:
|
||
* @pid: process id to watch. On POSIX the positive pid of a child
|
||
* process. On Windows a handle for a process (which doesn't have to be
|
||
* a child).
|
||
* @function: function to call
|
||
* @data: data to pass to @function
|
||
*
|
||
* Sets a function to be called when the child indicated by @pid
|
||
* exits, at a default priority, #G_PRIORITY_DEFAULT.
|
||
*
|
||
* If you obtain @pid from g_spawn_async() or g_spawn_async_with_pipes()
|
||
* you will need to pass #G_SPAWN_DO_NOT_REAP_CHILD as flag to
|
||
* the spawn function for the child watching to work.
|
||
*
|
||
* Note that on platforms where #GPid must be explicitly closed
|
||
* (see g_spawn_close_pid()) @pid must not be closed while the
|
||
* source is still active. Typically, you will want to call
|
||
* g_spawn_close_pid() in the callback function for the source.
|
||
*
|
||
* GLib supports only a single callback per process id.
|
||
* On POSIX platforms, the same restrictions mentioned for
|
||
* g_child_watch_source_new() apply to this function.
|
||
*
|
||
* This internally creates a main loop source using
|
||
* g_child_watch_source_new() and attaches it to the main loop context
|
||
* using g_source_attach(). You can do these steps manually if you
|
||
* need greater control.
|
||
*
|
||
* Returns: the ID (greater than 0) of the event source.
|
||
*
|
||
* Since: 2.4
|
||
**/
|
||
guint
|
||
g_child_watch_add (GPid pid,
|
||
GChildWatchFunc function,
|
||
gpointer data)
|
||
{
|
||
return g_child_watch_add_full (G_PRIORITY_DEFAULT, pid, function, data, NULL);
|
||
}
|
||
|
||
|
||
/* Idle functions */
|
||
|
||
static gboolean
|
||
g_idle_prepare (GSource *source,
|
||
gint *timeout)
|
||
{
|
||
*timeout = 0;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static gboolean
|
||
g_idle_check (GSource *source)
|
||
{
|
||
return TRUE;
|
||
}
|
||
|
||
static gboolean
|
||
g_idle_dispatch (GSource *source,
|
||
GSourceFunc callback,
|
||
gpointer user_data)
|
||
{
|
||
gboolean again;
|
||
|
||
if (!callback)
|
||
{
|
||
g_warning ("Idle source dispatched without callback. "
|
||
"You must call g_source_set_callback().");
|
||
return FALSE;
|
||
}
|
||
|
||
again = callback (user_data);
|
||
|
||
TRACE (GLIB_IDLE_DISPATCH (source, source->context, callback, user_data, again));
|
||
|
||
return again;
|
||
}
|
||
|
||
/**
|
||
* g_idle_source_new:
|
||
*
|
||
* Creates a new idle source.
|
||
*
|
||
* The source will not initially be associated with any #GMainContext
|
||
* and must be added to one with g_source_attach() before it will be
|
||
* executed. Note that the default priority for idle sources is
|
||
* %G_PRIORITY_DEFAULT_IDLE, as compared to other sources which
|
||
* have a default priority of %G_PRIORITY_DEFAULT.
|
||
*
|
||
* Returns: the newly-created idle source
|
||
**/
|
||
GSource *
|
||
g_idle_source_new (void)
|
||
{
|
||
GSource *source;
|
||
|
||
source = g_source_new (&g_idle_funcs, sizeof (GSource));
|
||
g_source_set_priority (source, G_PRIORITY_DEFAULT_IDLE);
|
||
|
||
/* Set a default name on the source, just in case the caller does not. */
|
||
g_source_set_name (source, "GIdleSource");
|
||
|
||
return source;
|
||
}
|
||
|
||
/**
|
||
* g_idle_add_full: (rename-to g_idle_add)
|
||
* @priority: the priority of the idle source. Typically this will be in the
|
||
* range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE.
|
||
* @function: function to call
|
||
* @data: data to pass to @function
|
||
* @notify: (nullable): function to call when the idle is removed, or %NULL
|
||
*
|
||
* Adds a function to be called whenever there are no higher priority
|
||
* events pending. If the function returns %FALSE it is automatically
|
||
* removed from the list of event sources and will not be called again.
|
||
*
|
||
* See [memory management of sources][mainloop-memory-management] for details
|
||
* on how to handle the return value and memory management of @data.
|
||
*
|
||
* This internally creates a main loop source using g_idle_source_new()
|
||
* and attaches it to the global #GMainContext using g_source_attach(), so
|
||
* the callback will be invoked in whichever thread is running that main
|
||
* context. You can do these steps manually if you need greater control or to
|
||
* use a custom main context.
|
||
*
|
||
* Returns: the ID (greater than 0) of the event source.
|
||
**/
|
||
guint
|
||
g_idle_add_full (gint priority,
|
||
GSourceFunc function,
|
||
gpointer data,
|
||
GDestroyNotify notify)
|
||
{
|
||
GSource *source;
|
||
guint id;
|
||
|
||
g_return_val_if_fail (function != NULL, 0);
|
||
|
||
source = g_idle_source_new ();
|
||
|
||
if (priority != G_PRIORITY_DEFAULT_IDLE)
|
||
g_source_set_priority (source, priority);
|
||
|
||
g_source_set_callback (source, function, data, notify);
|
||
id = g_source_attach (source, NULL);
|
||
|
||
TRACE (GLIB_IDLE_ADD (source, g_main_context_default (), id, priority, function, data));
|
||
|
||
g_source_unref (source);
|
||
|
||
return id;
|
||
}
|
||
|
||
/**
|
||
* g_idle_add:
|
||
* @function: function to call
|
||
* @data: data to pass to @function.
|
||
*
|
||
* Adds a function to be called whenever there are no higher priority
|
||
* events pending to the default main loop. The function is given the
|
||
* default idle priority, #G_PRIORITY_DEFAULT_IDLE. If the function
|
||
* returns %FALSE it is automatically removed from the list of event
|
||
* sources and will not be called again.
|
||
*
|
||
* See [memory management of sources][mainloop-memory-management] for details
|
||
* on how to handle the return value and memory management of @data.
|
||
*
|
||
* This internally creates a main loop source using g_idle_source_new()
|
||
* and attaches it to the global #GMainContext using g_source_attach(), so
|
||
* the callback will be invoked in whichever thread is running that main
|
||
* context. You can do these steps manually if you need greater control or to
|
||
* use a custom main context.
|
||
*
|
||
* Returns: the ID (greater than 0) of the event source.
|
||
**/
|
||
guint
|
||
g_idle_add (GSourceFunc function,
|
||
gpointer data)
|
||
{
|
||
return g_idle_add_full (G_PRIORITY_DEFAULT_IDLE, function, data, NULL);
|
||
}
|
||
|
||
/**
|
||
* g_idle_remove_by_data:
|
||
* @data: the data for the idle source's callback.
|
||
*
|
||
* Removes the idle function with the given data.
|
||
*
|
||
* Returns: %TRUE if an idle source was found and removed.
|
||
**/
|
||
gboolean
|
||
g_idle_remove_by_data (gpointer data)
|
||
{
|
||
return g_source_remove_by_funcs_user_data (&g_idle_funcs, data);
|
||
}
|
||
|
||
/**
|
||
* g_main_context_invoke:
|
||
* @context: (nullable): a #GMainContext, or %NULL
|
||
* @function: function to call
|
||
* @data: data to pass to @function
|
||
*
|
||
* Invokes a function in such a way that @context is owned during the
|
||
* invocation of @function.
|
||
*
|
||
* If @context is %NULL then the global default main context — as
|
||
* returned by g_main_context_default() — is used.
|
||
*
|
||
* If @context is owned by the current thread, @function is called
|
||
* directly. Otherwise, if @context is the thread-default main context
|
||
* of the current thread and g_main_context_acquire() succeeds, then
|
||
* @function is called and g_main_context_release() is called
|
||
* afterwards.
|
||
*
|
||
* In any other case, an idle source is created to call @function and
|
||
* that source is attached to @context (presumably to be run in another
|
||
* thread). The idle source is attached with #G_PRIORITY_DEFAULT
|
||
* priority. If you want a different priority, use
|
||
* g_main_context_invoke_full().
|
||
*
|
||
* Note that, as with normal idle functions, @function should probably
|
||
* return %FALSE. If it returns %TRUE, it will be continuously run in a
|
||
* loop (and may prevent this call from returning).
|
||
*
|
||
* Since: 2.28
|
||
**/
|
||
void
|
||
g_main_context_invoke (GMainContext *context,
|
||
GSourceFunc function,
|
||
gpointer data)
|
||
{
|
||
g_main_context_invoke_full (context,
|
||
G_PRIORITY_DEFAULT,
|
||
function, data, NULL);
|
||
}
|
||
|
||
/**
|
||
* g_main_context_invoke_full:
|
||
* @context: (nullable): a #GMainContext, or %NULL
|
||
* @priority: the priority at which to run @function
|
||
* @function: function to call
|
||
* @data: data to pass to @function
|
||
* @notify: (nullable): a function to call when @data is no longer in use, or %NULL.
|
||
*
|
||
* Invokes a function in such a way that @context is owned during the
|
||
* invocation of @function.
|
||
*
|
||
* This function is the same as g_main_context_invoke() except that it
|
||
* lets you specify the priority in case @function ends up being
|
||
* scheduled as an idle and also lets you give a #GDestroyNotify for @data.
|
||
*
|
||
* @notify should not assume that it is called from any particular
|
||
* thread or with any particular context acquired.
|
||
*
|
||
* Since: 2.28
|
||
**/
|
||
void
|
||
g_main_context_invoke_full (GMainContext *context,
|
||
gint priority,
|
||
GSourceFunc function,
|
||
gpointer data,
|
||
GDestroyNotify notify)
|
||
{
|
||
g_return_if_fail (function != NULL);
|
||
|
||
if (!context)
|
||
context = g_main_context_default ();
|
||
|
||
if (g_main_context_is_owner (context))
|
||
{
|
||
while (function (data));
|
||
if (notify != NULL)
|
||
notify (data);
|
||
}
|
||
|
||
else
|
||
{
|
||
GMainContext *thread_default;
|
||
|
||
thread_default = g_main_context_get_thread_default ();
|
||
|
||
if (!thread_default)
|
||
thread_default = g_main_context_default ();
|
||
|
||
if (thread_default == context && g_main_context_acquire (context))
|
||
{
|
||
while (function (data));
|
||
|
||
g_main_context_release (context);
|
||
|
||
if (notify != NULL)
|
||
notify (data);
|
||
}
|
||
else
|
||
{
|
||
GSource *source;
|
||
|
||
source = g_idle_source_new ();
|
||
g_source_set_priority (source, priority);
|
||
g_source_set_callback (source, function, data, notify);
|
||
g_source_attach (source, context);
|
||
g_source_unref (source);
|
||
}
|
||
}
|
||
}
|
||
|
||
static gpointer
|
||
glib_worker_main (gpointer data)
|
||
{
|
||
while (TRUE)
|
||
{
|
||
g_main_context_iteration (glib_worker_context, TRUE);
|
||
|
||
#ifdef G_OS_UNIX
|
||
if (any_unix_signal_pending)
|
||
dispatch_unix_signals ();
|
||
#endif
|
||
}
|
||
|
||
return NULL; /* worst GCC warning message ever... */
|
||
}
|
||
|
||
GMainContext *
|
||
g_get_worker_context (void)
|
||
{
|
||
static gsize initialised;
|
||
|
||
if (g_once_init_enter (&initialised))
|
||
{
|
||
/* mask all signals in the worker thread */
|
||
#ifdef G_OS_UNIX
|
||
sigset_t prev_mask;
|
||
sigset_t all;
|
||
|
||
sigfillset (&all);
|
||
pthread_sigmask (SIG_SETMASK, &all, &prev_mask);
|
||
#endif
|
||
glib_worker_context = g_main_context_new ();
|
||
g_thread_new ("gmain", glib_worker_main, NULL);
|
||
#ifdef G_OS_UNIX
|
||
pthread_sigmask (SIG_SETMASK, &prev_mask, NULL);
|
||
#endif
|
||
g_once_init_leave (&initialised, TRUE);
|
||
}
|
||
|
||
return glib_worker_context;
|
||
}
|