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8c90d7766b
glib/glib/gmain.c
Sebastian Wilhelmi 8c90d7766b Add configure test for garbage collector friendliness for GLib. If 
2000-04-17  Sebastian Wilhelmi  <wilhelmi@ira.uka.de>

	* configure.in, acconfig.h: Add configure test for garbage
	collector friendliness for GLib. If enabled, ENABLE_GC_FRIENDLY
	will be defined.

	* garray.c, ghash.c, glist.c, gmain.c, gmem.c, gnode.c, gqueue.c,
	gslist.c, gtree.c: If ENABLE_GC_FRIENDLY is defined, NULLify all
	memory released by the user, but cached by GLib. This lets a
	garbage collector have a more correct view of the actually used
	memory.
2000-04-17 13:23:27 +00:00

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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* gmain.c: Main loop abstraction, timeouts, and idle functions
* Copyright 1998 Owen Taylor
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GLib Team and others 1997-1999. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
/*
* MT safe
*/
#include "config.h"
/* uncomment the next line to get poll() debugging info */
/* #define G_MAIN_POLL_DEBUG */
#include "glib.h"
#include <sys/types.h>
#include <time.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif /* HAVE_SYS_TIME_H */
#ifdef GLIB_HAVE_SYS_POLL_H
# include <sys/poll.h>
# undef events /* AIX 4.1.5 & 4.3.2 define this for SVR3,4 compatibility */
# undef revents /* AIX 4.1.5 & 4.3.2 define this for SVR3,4 compatibility */
#endif /* GLIB_HAVE_SYS_POLL_H */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <errno.h>
#ifdef G_OS_WIN32
#define STRICT
#include <windows.h>
#endif /* G_OS_WIN32 */
#ifdef G_OS_BEOS
#include <net/socket.h>
#endif /* G_OS_BEOS */
/* Types */
typedef struct _GTimeoutData GTimeoutData;
typedef struct _GSource GSource;
typedef struct _GPollRec GPollRec;
typedef enum
{
G_SOURCE_READY = 1 << G_HOOK_FLAG_USER_SHIFT,
G_SOURCE_CAN_RECURSE = 1 << (G_HOOK_FLAG_USER_SHIFT + 1)
} GSourceFlags;
struct _GSource
{
GHook hook;
gint priority;
gpointer source_data;
};
struct _GMainLoop
{
gboolean is_running;
};
struct _GTimeoutData
{
GTimeVal expiration;
gint interval;
GSourceFunc callback;
};
struct _GPollRec
{
gint priority;
GPollFD *fd;
GPollRec *next;
};
/* Forward declarations */
static gint g_source_compare (GHook *a,
GHook *b);
static void g_source_destroy_func (GHookList *hook_list,
GHook *hook);
static void g_main_poll (gint timeout,
gboolean use_priority,
gint priority);
static void g_main_add_poll_unlocked (gint priority,
GPollFD *fd);
static void g_main_wakeup (void);
static gboolean g_timeout_prepare (gpointer source_data,
GTimeVal *current_time,
gint *timeout,
gpointer user_data);
static gboolean g_timeout_check (gpointer source_data,
GTimeVal *current_time,
gpointer user_data);
static gboolean g_timeout_dispatch (gpointer source_data,
GTimeVal *dispatch_time,
gpointer user_data);
static gboolean g_idle_prepare (gpointer source_data,
GTimeVal *current_time,
gint *timeout,
gpointer user_data);
static gboolean g_idle_check (gpointer source_data,
GTimeVal *current_time,
gpointer user_data);
static gboolean g_idle_dispatch (gpointer source_data,
GTimeVal *dispatch_time,
gpointer user_data);
/* Data */
static GSList *pending_dispatches = NULL;
static GHookList source_list = { 0 };
static gint in_check_or_prepare = 0;
/* The following lock is used for both the list of sources
* and the list of poll records
*/
G_LOCK_DEFINE_STATIC (main_loop);
static GSourceFuncs timeout_funcs =
{
g_timeout_prepare,
g_timeout_check,
g_timeout_dispatch,
g_free,
};
static GSourceFuncs idle_funcs =
{
g_idle_prepare,
g_idle_check,
g_idle_dispatch,
NULL,
};
static GPollRec *poll_records = NULL;
static GPollRec *poll_free_list = NULL;
static GMemChunk *poll_chunk;
static guint n_poll_records = 0;
#ifdef G_THREADS_ENABLED
#ifndef G_OS_WIN32
/* this pipe is used to wake up the main loop when a source is added.
*/
static gint wake_up_pipe[2] = { -1, -1 };
#else /* G_OS_WIN32 */
static HANDLE wake_up_semaphore = NULL;
#endif /* G_OS_WIN32 */
static GPollFD wake_up_rec;
static gboolean poll_waiting = FALSE;
/* Flag indicating whether the set of fd's changed during a poll */
static gboolean poll_changed = FALSE;
#endif /* G_THREADS_ENABLED */
#ifdef HAVE_POLL
/* SunOS has poll, but doesn't provide a prototype. */
# if defined (sun) && !defined (__SVR4)
extern gint poll (GPollFD *ufds, guint nfsd, gint timeout);
# endif /* !sun */
static GPollFunc poll_func = (GPollFunc) poll;
#else /* !HAVE_POLL */
#ifdef G_OS_WIN32
static gint
g_poll (GPollFD *fds, guint nfds, gint timeout)
{
HANDLE handles[MAXIMUM_WAIT_OBJECTS];
GPollFD *f;
DWORD ready;
MSG msg;
UINT timer;
LONG prevcnt;
gint poll_msgs = -1;
gint nhandles = 0;
for (f = fds; f < &fds[nfds]; ++f)
if (f->fd >= 0)
{
if (f->events & G_IO_IN)
if (f->fd == G_WIN32_MSG_HANDLE)
poll_msgs = f - fds;
else
{
/* g_print ("g_poll: waiting for handle %#x\n", f->fd); */
handles[nhandles++] = (HANDLE) f->fd;
}
}
if (timeout == -1)
timeout = INFINITE;
if (poll_msgs >= 0)
{
/* Waiting for messages, and maybe events */
if (nhandles == 0)
{
if (timeout == INFINITE)
{
/* Waiting just for messages, infinite timeout
* -> Use PeekMessage, then WaitMessage
*/
/* g_print ("WaitMessage, PeekMessage\n"); */
if (PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE))
ready = WAIT_OBJECT_0;
else if (!WaitMessage ())
g_warning ("g_poll: WaitMessage failed");
ready = WAIT_OBJECT_0;
}
else if (timeout == 0)
{
/* Waiting just for messages, zero timeout
* -> Use PeekMessage
*/
/* g_print ("PeekMessage\n"); */
if (PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE))
ready = WAIT_OBJECT_0;
else
ready = WAIT_TIMEOUT;
}
else
{
/* Waiting just for messages, some timeout
* -> First try PeekMessage, then set a timer, wait for message,
* kill timer, use PeekMessage
*/
/* g_print ("PeekMessage\n"); */
if (PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE))
ready = WAIT_OBJECT_0;
else if ((timer = SetTimer (NULL, 0, timeout, NULL)) == 0)
g_warning ("g_poll: SetTimer failed");
else
{
/* g_print ("WaitMessage\n"); */
WaitMessage ();
KillTimer (NULL, timer);
if (PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE))
ready = WAIT_OBJECT_0;
else
ready = WAIT_TIMEOUT;
}
}
}
else
{
/* Wait for either message or event
* -> Use MsgWaitForMultipleObjects
*/
/* g_print ("MsgWaitForMultipleObjects(%d, %d)\n", nhandles, timeout); */
ready = MsgWaitForMultipleObjects (nhandles, handles, FALSE,
timeout, QS_ALLINPUT);
/* g_print("=%d\n", ready); */
if (ready == WAIT_FAILED)
g_warning ("g_poll: MsgWaitForMultipleObjects failed");
}
}
else if (nhandles == 0)
{
/* Wait for nothing (huh?) */
return 0;
}
else
{
/* Wait for just events
* -> Use WaitForMultipleObjects
*/
/* g_print ("WaitForMultipleObjects(%d, %d)\n", nhandles, timeout); */
ready = WaitForMultipleObjects (nhandles, handles, FALSE, timeout);
/* g_print("=%d\n", ready); */
if (ready == WAIT_FAILED)
g_warning ("g_poll: WaitForMultipleObjects failed");
}
for (f = fds; f < &fds[nfds]; ++f)
f->revents = 0;
if (ready == WAIT_FAILED)
return -1;
else if (poll_msgs >= 0 && ready == WAIT_OBJECT_0 + nhandles)
{
fds[poll_msgs].revents |= G_IO_IN;
}
else if (ready >= WAIT_OBJECT_0 && ready < WAIT_OBJECT_0 + nhandles)
for (f = fds; f < &fds[nfds]; ++f)
{
if ((f->events & G_IO_IN)
&& f->fd == (gint) handles[ready - WAIT_OBJECT_0])
{
f->revents |= G_IO_IN;
/* g_print ("event %#x\n", f->fd); */
ResetEvent ((HANDLE) f->fd);
}
}
if (ready == WAIT_TIMEOUT)
return 0;
else
return 1;
}
#else /* !G_OS_WIN32 */
/* The following implementation of poll() comes from the GNU C Library.
* Copyright (C) 1994, 1996, 1997 Free Software Foundation, Inc.
*/
#include <string.h> /* for bzero on BSD systems */
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif /* HAVE_SYS_SELECT_H */
#ifdef G_OS_BEOS
#undef NO_FD_SET
#endif /* G_OS_BEOS */
#ifndef NO_FD_SET
# define SELECT_MASK fd_set
#else /* !NO_FD_SET */
# ifndef _AIX
typedef long fd_mask;
# endif /* _AIX */
# ifdef _IBMR2
# define SELECT_MASK void
# else /* !_IBMR2 */
# define SELECT_MASK int
# endif /* !_IBMR2 */
#endif /* !NO_FD_SET */
static gint
g_poll (GPollFD *fds,
guint nfds,
gint timeout)
{
struct timeval tv;
SELECT_MASK rset, wset, xset;
GPollFD *f;
int ready;
int maxfd = 0;
FD_ZERO (&rset);
FD_ZERO (&wset);
FD_ZERO (&xset);
for (f = fds; f < &fds[nfds]; ++f)
if (f->fd >= 0)
{
if (f->events & G_IO_IN)
FD_SET (f->fd, &rset);
if (f->events & G_IO_OUT)
FD_SET (f->fd, &wset);
if (f->events & G_IO_PRI)
FD_SET (f->fd, &xset);
if (f->fd > maxfd && (f->events & (G_IO_IN|G_IO_OUT|G_IO_PRI)))
maxfd = f->fd;
}
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout % 1000) * 1000;
ready = select (maxfd + 1, &rset, &wset, &xset,
timeout == -1 ? NULL : &tv);
if (ready > 0)
for (f = fds; f < &fds[nfds]; ++f)
{
f->revents = 0;
if (f->fd >= 0)
{
if (FD_ISSET (f->fd, &rset))
f->revents |= G_IO_IN;
if (FD_ISSET (f->fd, &wset))
f->revents |= G_IO_OUT;
if (FD_ISSET (f->fd, &xset))
f->revents |= G_IO_PRI;
}
}
return ready;
}
#endif /* !G_OS_WIN32 */
static GPollFunc poll_func = g_poll;
#endif /* !HAVE_POLL */
/* Hooks for adding to the main loop */
/* Use knowledge of insert_sorted algorithm here to make
* sure we insert at the end of equal priority items
*/
static gint
g_source_compare (GHook *a,
GHook *b)
{
GSource *source_a = (GSource *)a;
GSource *source_b = (GSource *)b;
return (source_a->priority < source_b->priority) ? -1 : 1;
}
/* HOLDS: main_loop lock */
static void
g_source_destroy_func (GHookList *hook_list,
GHook *hook)
{
GSource *source = (GSource*) hook;
GDestroyNotify destroy;
G_UNLOCK (main_loop);
destroy = hook->destroy;
if (destroy)
destroy (hook->data);
destroy = ((GSourceFuncs*) hook->func)->destroy;
if (destroy)
destroy (source->source_data);
G_LOCK (main_loop);
}
guint
g_source_add (gint priority,
gboolean can_recurse,
GSourceFuncs *funcs,
gpointer source_data,
gpointer user_data,
GDestroyNotify notify)
{
guint return_val;
GSource *source;
G_LOCK (main_loop);
if (!source_list.is_setup)
{
g_hook_list_init (&source_list, sizeof (GSource));
source_list.hook_destroy = G_HOOK_DEFERRED_DESTROY;
source_list.hook_free = g_source_destroy_func;
}
source = (GSource*) g_hook_alloc (&source_list);
source->priority = priority;
source->source_data = source_data;
source->hook.func = funcs;
source->hook.data = user_data;
source->hook.destroy = notify;
g_hook_insert_sorted (&source_list,
(GHook *)source,
g_source_compare);
if (can_recurse)
source->hook.flags |= G_SOURCE_CAN_RECURSE;
return_val = source->hook.hook_id;
#ifdef G_THREADS_ENABLED
/* Now wake up the main loop if it is waiting in the poll() */
g_main_wakeup ();
#endif
G_UNLOCK (main_loop);
return return_val;
}
gboolean
g_source_remove (guint tag)
{
GHook *hook;
g_return_val_if_fail (tag > 0, FALSE);
G_LOCK (main_loop);
hook = g_hook_get (&source_list, tag);
if (hook)
g_hook_destroy_link (&source_list, hook);
G_UNLOCK (main_loop);
return hook != NULL;
}
gboolean
g_source_remove_by_user_data (gpointer user_data)
{
GHook *hook;
G_LOCK (main_loop);
hook = g_hook_find_data (&source_list, TRUE, user_data);
if (hook)
g_hook_destroy_link (&source_list, hook);
G_UNLOCK (main_loop);
return hook != NULL;
}
static gboolean
g_source_find_source_data (GHook *hook,
gpointer data)
{
GSource *source = (GSource *)hook;
return (source->source_data == data);
}
gboolean
g_source_remove_by_source_data (gpointer source_data)
{
GHook *hook;
G_LOCK (main_loop);
hook = g_hook_find (&source_list, TRUE,
g_source_find_source_data, source_data);
if (hook)
g_hook_destroy_link (&source_list, hook);
G_UNLOCK (main_loop);
return hook != NULL;
}
static gboolean
g_source_find_funcs_user_data (GHook *hook,
gpointer data)
{
gpointer *d = data;
return hook->func == d[0] && hook->data == d[1];
}
gboolean
g_source_remove_by_funcs_user_data (GSourceFuncs *funcs,
gpointer user_data)
{
gpointer d[2];
GHook *hook;
g_return_val_if_fail (funcs != NULL, FALSE);
G_LOCK (main_loop);
d[0] = funcs;
d[1] = user_data;
hook = g_hook_find (&source_list, TRUE,
g_source_find_funcs_user_data, d);
if (hook)
g_hook_destroy_link (&source_list, hook);
G_UNLOCK (main_loop);
return hook != NULL;
}
void
g_get_current_time (GTimeVal *result)
{
#ifndef G_OS_WIN32
struct timeval r;
g_return_if_fail (result != NULL);
/*this is required on alpha, there the timeval structs are int's
not longs and a cast only would fail horribly*/
gettimeofday (&r, NULL);
result->tv_sec = r.tv_sec;
result->tv_usec = r.tv_usec;
#else
/* Avoid calling time() except for the first time.
* GetTickCount() should be pretty fast and low-level?
* I could also use ftime() but it seems unnecessarily overheady.
*/
static DWORD start_tick = 0;
static time_t start_time;
DWORD tick;
time_t t;
g_return_if_fail (result != NULL);
if (start_tick == 0)
{
start_tick = GetTickCount ();
time (&start_time);
}
tick = GetTickCount ();
result->tv_sec = (tick - start_tick) / 1000 + start_time;
result->tv_usec = ((tick - start_tick) % 1000) * 1000;
#endif
}
/* Running the main loop */
/* HOLDS: main_loop_lock */
static void
g_main_dispatch (GTimeVal *dispatch_time)
{
while (pending_dispatches != NULL)
{
gboolean need_destroy;
GSource *source = pending_dispatches->data;
GSList *tmp_list;
tmp_list = pending_dispatches;
pending_dispatches = g_slist_remove_link (pending_dispatches, pending_dispatches);
g_slist_free_1 (tmp_list);
if (G_HOOK_IS_VALID (source))
{
gboolean was_in_call;
gpointer hook_data = source->hook.data;
gpointer source_data = source->source_data;
gboolean (*dispatch) (gpointer,
GTimeVal *,
gpointer);
dispatch = ((GSourceFuncs *) source->hook.func)->dispatch;
was_in_call = G_HOOK_IN_CALL (source);
source->hook.flags |= G_HOOK_FLAG_IN_CALL;
G_UNLOCK (main_loop);
need_destroy = ! dispatch (source_data,
dispatch_time,
hook_data);
G_LOCK (main_loop);
if (!was_in_call)
source->hook.flags &= ~G_HOOK_FLAG_IN_CALL;
if (need_destroy && G_HOOK_IS_VALID (source))
g_hook_destroy_link (&source_list, (GHook *) source);
}
g_hook_unref (&source_list, (GHook*) source);
}
}
/* g_main_iterate () runs a single iteration of the mainloop, or,
* if !dispatch checks to see if any sources need dispatching.
* basic algorithm for dispatch=TRUE:
*
* 1) while the list of currently pending sources is non-empty,
* we call (*dispatch) on those that are !IN_CALL or can_recurse,
* removing sources from the list after each returns.
* the return value of (*dispatch) determines whether the source
* itself is kept alive.
*
* 2) call (*prepare) for sources that are not yet SOURCE_READY and
* are !IN_CALL or can_recurse. a return value of TRUE determines
* that the source would like to be dispatched immediatedly, it
* is then flagged as SOURCE_READY.
*
* 3) poll with the pollfds from all sources at the priority of the
* first source flagged as SOURCE_READY. if there are any sources
* flagged as SOURCE_READY, we use a timeout of 0 or the minimum
* of all timouts otherwise.
*
* 4) for each source !IN_CALL or can_recurse, if SOURCE_READY or
* (*check) returns true, add the source to the pending list.
* once one source returns true, stop after checking all sources
* at that priority.
*
* 5) while the list of currently pending sources is non-empty,
* call (*dispatch) on each source, removing the source
* after the call.
*
*/
static gboolean
g_main_iterate (gboolean block,
gboolean dispatch)
{
GHook *hook;
GTimeVal current_time = { 0, 0 };
gint n_ready = 0;
gint current_priority = 0;
gint timeout;
gboolean retval = FALSE;
g_return_val_if_fail (!block || dispatch, FALSE);
g_get_current_time (&current_time);
G_LOCK (main_loop);
#ifdef G_THREADS_ENABLED
if (poll_waiting)
{
g_warning("g_main_iterate(): main loop already active in another thread");
G_UNLOCK (main_loop);
return FALSE;
}
#endif G_THREADS_ENABLED
/* If recursing, finish up current dispatch, before starting over */
if (pending_dispatches)
{
if (dispatch)
g_main_dispatch (&current_time);
G_UNLOCK (main_loop);
return TRUE;
}
/* Prepare all sources */
timeout = block ? -1 : 0;
hook = g_hook_first_valid (&source_list, TRUE);
while (hook)
{
GSource *source = (GSource*) hook;
gint source_timeout = -1;
if ((n_ready > 0) && (source->priority > current_priority))
{
g_hook_unref (&source_list, hook);
break;
}
if (G_HOOK_IN_CALL (hook) && !(hook->flags & G_SOURCE_CAN_RECURSE))
{
hook = g_hook_next_valid (&source_list, hook, TRUE);
continue;
}
if (!(hook->flags & G_SOURCE_READY))
{
gboolean (*prepare) (gpointer source_data,
GTimeVal *current_time,
gint *timeout,
gpointer user_data);
prepare = ((GSourceFuncs *) hook->func)->prepare;
in_check_or_prepare++;
G_UNLOCK (main_loop);
if ((*prepare) (source->source_data, &current_time, &source_timeout, source->hook.data))
hook->flags |= G_SOURCE_READY;
G_LOCK (main_loop);
in_check_or_prepare--;
}
if (hook->flags & G_SOURCE_READY)
{
if (!dispatch)
{
g_hook_unref (&source_list, hook);
G_UNLOCK (main_loop);
return TRUE;
}
else
{
n_ready++;
current_priority = source->priority;
timeout = 0;
}
}
if (source_timeout >= 0)
{
if (timeout < 0)
timeout = source_timeout;
else
timeout = MIN (timeout, source_timeout);
}
hook = g_hook_next_valid (&source_list, hook, TRUE);
}
/* poll(), if necessary */
g_main_poll (timeout, n_ready > 0, current_priority);
if (timeout != 0)
g_get_current_time (&current_time);
/* Check to see what sources need to be dispatched */
n_ready = 0;
hook = g_hook_first_valid (&source_list, TRUE);
while (hook)
{
GSource *source = (GSource *)hook;
if ((n_ready > 0) && (source->priority > current_priority))
{
g_hook_unref (&source_list, hook);
break;
}
if (G_HOOK_IN_CALL (hook) && !(hook->flags & G_SOURCE_CAN_RECURSE))
{
hook = g_hook_next_valid (&source_list, hook, TRUE);
continue;
}
if (!(hook->flags & G_SOURCE_READY))
{
gboolean (*check) (gpointer source_data,
GTimeVal *current_time,
gpointer user_data);
check = ((GSourceFuncs *) hook->func)->check;
in_check_or_prepare++;
G_UNLOCK (main_loop);
if ((*check) (source->source_data, &current_time, source->hook.data))
hook->flags |= G_SOURCE_READY;
G_LOCK (main_loop);
in_check_or_prepare--;
}
if (hook->flags & G_SOURCE_READY)
{
if (dispatch)
{
hook->flags &= ~G_SOURCE_READY;
g_hook_ref (&source_list, hook);
pending_dispatches = g_slist_prepend (pending_dispatches, source);
current_priority = source->priority;
n_ready++;
}
else
{
g_hook_unref (&source_list, hook);
G_UNLOCK (main_loop);
return TRUE;
}
}
hook = g_hook_next_valid (&source_list, hook, TRUE);
}
/* Now invoke the callbacks */
if (pending_dispatches)
{
pending_dispatches = g_slist_reverse (pending_dispatches);
g_main_dispatch (&current_time);
retval = TRUE;
}
G_UNLOCK (main_loop);
return retval;
}
/* See if any events are pending
*/
gboolean
g_main_pending (void)
{
return in_check_or_prepare ? FALSE : g_main_iterate (FALSE, FALSE);
}
/* Run a single iteration of the mainloop. If block is FALSE,
* will never block
*/
gboolean
g_main_iteration (gboolean block)
{
if (in_check_or_prepare)
{
g_warning ("g_main_iteration(): called recursively from within a source's check() or "
"prepare() member or from a second thread, iteration not possible");
return FALSE;
}
else
return g_main_iterate (block, TRUE);
}
GMainLoop*
g_main_new (gboolean is_running)
{
GMainLoop *loop;
loop = g_new0 (GMainLoop, 1);
loop->is_running = is_running != FALSE;
return loop;
}
void
g_main_run (GMainLoop *loop)
{
g_return_if_fail (loop != NULL);
if (in_check_or_prepare)
{
g_warning ("g_main_run(): called recursively from within a source's check() or "
"prepare() member or from a second thread, iteration not possible");
return;
}
loop->is_running = TRUE;
while (loop->is_running)
g_main_iterate (TRUE, TRUE);
}
void
g_main_quit (GMainLoop *loop)
{
g_return_if_fail (loop != NULL);
loop->is_running = FALSE;
}
void
g_main_destroy (GMainLoop *loop)
{
g_return_if_fail (loop != NULL);
g_free (loop);
}
gboolean
g_main_is_running (GMainLoop *loop)
{
g_return_val_if_fail (loop != NULL, FALSE);
return loop->is_running;
}
/* HOLDS: main_loop_lock */
static void
g_main_poll (gint timeout,
gboolean use_priority,
gint priority)
{
#ifdef G_MAIN_POLL_DEBUG
GTimer *poll_timer;
#endif
GPollFD *fd_array;
GPollRec *pollrec;
gint i;
gint npoll;
#ifdef G_THREADS_ENABLED
#ifndef G_OS_WIN32
if (wake_up_pipe[0] < 0)
{
if (pipe (wake_up_pipe) < 0)
g_error ("Cannot create pipe main loop wake-up: %s\n",
g_strerror (errno));
wake_up_rec.fd = wake_up_pipe[0];
wake_up_rec.events = G_IO_IN;
g_main_add_poll_unlocked (0, &wake_up_rec);
}
#else
if (wake_up_semaphore == NULL)
{
if ((wake_up_semaphore = CreateSemaphore (NULL, 0, 100, NULL)) == NULL)
g_error ("Cannot create wake-up semaphore: %d", GetLastError ());
wake_up_rec.fd = (gint) wake_up_semaphore;
wake_up_rec.events = G_IO_IN;
g_main_add_poll_unlocked (0, &wake_up_rec);
}
#endif
#endif
fd_array = g_new (GPollFD, n_poll_records);
pollrec = poll_records;
i = 0;
while (pollrec && (!use_priority || priority >= pollrec->priority))
{
if (pollrec->fd->events)
{
fd_array[i].fd = pollrec->fd->fd;
/* 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.
*/
fd_array[i].events = pollrec->fd->events & ~(G_IO_ERR|G_IO_HUP|G_IO_NVAL);
fd_array[i].revents = 0;
i++;
}
pollrec = pollrec->next;
}
#ifdef G_THREADS_ENABLED
poll_waiting = TRUE;
poll_changed = FALSE;
#endif
npoll = i;
if (npoll || timeout != 0)
{
#ifdef G_MAIN_POLL_DEBUG
g_print ("g_main_poll(%d) timeout: %d\r", npoll, timeout);
poll_timer = g_timer_new ();
#endif
G_UNLOCK (main_loop);
if ((*poll_func) (fd_array, npoll, timeout) < 0)
g_warning ("poll(2) failed due to: %s.",
g_strerror (errno));
G_LOCK (main_loop);
#ifdef G_MAIN_POLL_DEBUG
g_print ("g_main_poll(%d) timeout: %d - elapsed %12.10f seconds",
npoll,
timeout,
g_timer_elapsed (poll_timer, NULL));
g_timer_destroy (poll_timer);
pollrec = poll_records;
i = 0;
while (i < npoll)
{
if (pollrec->fd->events)
{
if (fd_array[i].revents)
{
g_print (" [%d:", fd_array[i].fd);
if (fd_array[i].revents & G_IO_IN)
g_print ("i");
if (fd_array[i].revents & G_IO_OUT)
g_print ("o");
if (fd_array[i].revents & G_IO_PRI)
g_print ("p");
if (fd_array[i].revents & G_IO_ERR)
g_print ("e");
if (fd_array[i].revents & G_IO_HUP)
g_print ("h");
if (fd_array[i].revents & G_IO_NVAL)
g_print ("n");
g_print ("]");
}
i++;
}
pollrec = pollrec->next;
}
g_print ("\n");
#endif
} /* if (npoll || timeout != 0) */
#ifdef G_THREADS_ENABLED
if (!poll_waiting)
{
#ifndef G_OS_WIN32
gchar c;
read (wake_up_pipe[0], &c, 1);
#endif
}
else
poll_waiting = FALSE;
/* If the set of poll file descriptors changed, bail out
* and let the main loop rerun
*/
if (poll_changed)
{
g_free (fd_array);
return;
}
#endif
pollrec = poll_records;
i = 0;
while (i < npoll)
{
if (pollrec->fd->events)
{
pollrec->fd->revents = fd_array[i].revents;
i++;
}
pollrec = pollrec->next;
}
g_free (fd_array);
}
void
g_main_add_poll (GPollFD *fd,
gint priority)
{
G_LOCK (main_loop);
g_main_add_poll_unlocked (priority, fd);
G_UNLOCK (main_loop);
}
/* HOLDS: main_loop_lock */
static void
g_main_add_poll_unlocked (gint priority,
GPollFD *fd)
{
GPollRec *lastrec, *pollrec, *newrec;
if (!poll_chunk)
poll_chunk = g_mem_chunk_create (GPollRec, 32, G_ALLOC_ONLY);
if (poll_free_list)
{
newrec = poll_free_list;
poll_free_list = newrec->next;
}
else
newrec = g_chunk_new (GPollRec, poll_chunk);
newrec->fd = fd;
newrec->priority = priority;
lastrec = NULL;
pollrec = poll_records;
while (pollrec && priority >= pollrec->priority)
{
lastrec = pollrec;
pollrec = pollrec->next;
}
if (lastrec)
lastrec->next = newrec;
else
poll_records = newrec;
newrec->next = pollrec;
n_poll_records++;
#ifdef G_THREADS_ENABLED
poll_changed = TRUE;
/* Now wake up the main loop if it is waiting in the poll() */
g_main_wakeup ();
#endif
}
void
g_main_remove_poll (GPollFD *fd)
{
GPollRec *pollrec, *lastrec;
G_LOCK (main_loop);
lastrec = NULL;
pollrec = poll_records;
while (pollrec)
{
if (pollrec->fd == fd)
{
if (lastrec != NULL)
lastrec->next = pollrec->next;
else
poll_records = pollrec->next;
#ifdef ENABLE_GC_FRIENDLY
pollrec->fd = NULL;
#endif /* ENABLE_GC_FRIENDLY */
pollrec->next = poll_free_list;
poll_free_list = pollrec;
n_poll_records--;
break;
}
lastrec = pollrec;
pollrec = pollrec->next;
}
#ifdef G_THREADS_ENABLED
poll_changed = TRUE;
/* Now wake up the main loop if it is waiting in the poll() */
g_main_wakeup ();
#endif
G_UNLOCK (main_loop);
}
void
g_main_set_poll_func (GPollFunc func)
{
if (func)
poll_func = func;
else
#ifdef HAVE_POLL
poll_func = (GPollFunc) poll;
#else
poll_func = (GPollFunc) g_poll;
#endif
}
/* Wake the main loop up from a poll() */
static void
g_main_wakeup (void)
{
#ifdef G_THREADS_ENABLED
if (poll_waiting)
{
poll_waiting = FALSE;
#ifndef G_OS_WIN32
write (wake_up_pipe[1], "A", 1);
#else
ReleaseSemaphore (wake_up_semaphore, 1, NULL);
#endif
}
#endif
}
/* Timeouts */
static void
g_timeout_set_expiration (GTimeoutData *data,
GTimeVal *current_time)
{
guint seconds = data->interval / 1000;
guint msecs = data->interval - seconds * 1000;
data->expiration.tv_sec = current_time->tv_sec + seconds;
data->expiration.tv_usec = current_time->tv_usec + msecs * 1000;
if (data->expiration.tv_usec >= 1000000)
{
data->expiration.tv_usec -= 1000000;
data->expiration.tv_sec++;
}
}
static gboolean
g_timeout_prepare (gpointer source_data,
GTimeVal *current_time,
gint *timeout,
gpointer user_data)
{
glong msec;
GTimeoutData *data = source_data;
msec = ((data->expiration.tv_sec - current_time->tv_sec) * 1000 +
(data->expiration.tv_usec - current_time->tv_usec) / 1000);
if (msec < 0)
msec = 0;
else if (msec > data->interval)
{
/* The system time has been set backwards, so we
* reset the expiration time to now + data->interval;
* this at least avoids hanging for long periods of time.
*/
g_timeout_set_expiration (data, current_time);
msec = data->interval;
}
*timeout = msec;
return msec == 0;
}
static gboolean
g_timeout_check (gpointer source_data,
GTimeVal *current_time,
gpointer user_data)
{
GTimeoutData *data = source_data;
return ((data->expiration.tv_sec < current_time->tv_sec) ||
((data->expiration.tv_sec == current_time->tv_sec) &&
(data->expiration.tv_usec <= current_time->tv_usec)));
}
static gboolean
g_timeout_dispatch (gpointer source_data,
GTimeVal *dispatch_time,
gpointer user_data)
{
GTimeoutData *data = source_data;
if (data->callback (user_data))
{
g_timeout_set_expiration (data, dispatch_time);
return TRUE;
}
else
return FALSE;
}
guint
g_timeout_add_full (gint priority,
guint interval,
GSourceFunc function,
gpointer data,
GDestroyNotify notify)
{
GTimeoutData *timeout_data = g_new (GTimeoutData, 1);
GTimeVal current_time;
timeout_data->interval = interval;
timeout_data->callback = function;
g_get_current_time (&current_time);
g_timeout_set_expiration (timeout_data, &current_time);
return g_source_add (priority, FALSE, &timeout_funcs, timeout_data, data, notify);
}
guint
g_timeout_add (guint32 interval,
GSourceFunc function,
gpointer data)
{
return g_timeout_add_full (G_PRIORITY_DEFAULT,
interval, function, data, NULL);
}
/* Idle functions */
static gboolean
g_idle_prepare (gpointer source_data,
GTimeVal *current_time,
gint *timeout,
gpointer user_data)
{
timeout = 0;
return TRUE;
}
static gboolean
g_idle_check (gpointer source_data,
GTimeVal *current_time,
gpointer user_data)
{
return TRUE;
}
static gboolean
g_idle_dispatch (gpointer source_data,
GTimeVal *dispatch_time,
gpointer user_data)
{
GSourceFunc func = source_data;
return func (user_data);
}
guint
g_idle_add_full (gint priority,
GSourceFunc function,
gpointer data,
GDestroyNotify notify)
{
g_return_val_if_fail (function != NULL, 0);
return g_source_add (priority, FALSE, &idle_funcs, function, data, notify);
}
guint
g_idle_add (GSourceFunc function,
gpointer data)
{
return g_idle_add_full (G_PRIORITY_DEFAULT_IDLE, function, data, NULL);
}
gboolean
g_idle_remove_by_data (gpointer data)
{
return g_source_remove_by_funcs_user_data (&idle_funcs, data);
}
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