/* gmain.h - the GLib Main loop * Copyright (C) 1998-2000 Red Hat, Inc. * * 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. */ #ifndef __G_MAIN_H__ #define __G_MAIN_H__ #include #include G_BEGIN_DECLS typedef struct _GMainContext GMainContext; /* Opaque */ typedef struct _GMainLoop GMainLoop; /* Opaque */ typedef struct _GSource GSource; typedef struct _GSourceCallbackFuncs GSourceCallbackFuncs; typedef struct _GSourceFuncs GSourceFuncs; typedef gboolean (*GSourceFunc) (gpointer data); struct _GSource { /*< private >*/ gpointer callback_data; GSourceCallbackFuncs *callback_funcs; GSourceFuncs *source_funcs; guint ref_count; GMainContext *context; gint priority; guint flags; guint id; GSList *poll_fds; GSource *prev; GSource *next; }; struct _GSourceCallbackFuncs { void (*ref) (gpointer cb_data); void (*unref) (gpointer cb_data); void (*get) (gpointer cb_data, GSourceFunc *func, gpointer *data); }; struct _GSourceFuncs { gboolean (*prepare) (GSource *source, gint *timeout); gboolean (*check) (GSource *source); gboolean (*dispatch) (GSource *source, GSourceFunc callback, gpointer user_data); void (*destroy) (GSource *source); /* Can be NULL */ }; /* Any definitions using GPollFD or GPollFunc are primarily * for Unix and not guaranteed to be the compatible on all * operating systems on which GLib runs. Right now, the * GLib does use these functions on Win32 as well, but interprets * them in a fairly different way than on Unix. If you use * these definitions, you are should be prepared to recode * for different operating systems. * * * On Win32, the fd in a GPollFD should be Win32 HANDLE (*not* a file * descriptor as provided by the C runtime) that can be used by * MsgWaitForMultipleObjects. This does *not* include file handles * from CreateFile, SOCKETs, nor pipe handles. (But you can use * WSAEventSelect to signal events when a SOCKET is readable). * * On Win32, fd can also be the special value G_WIN32_MSG_HANDLE to * indicate polling for messages. These message queue GPollFDs should * be added with the g_main_poll_win32_msg_add function. * * But note that G_WIN32_MSG_HANDLE GPollFDs should not be used by GDK * (GTK) programs, as GDK itself wants to read messages and convert them * to GDK events. * * So, unless you really know what you are doing, it's best not to try * to use the main loop polling stuff for your own needs on * Win32. It's really only written for the GIMP's needs so * far. */ typedef struct _GPollFD GPollFD; typedef gint (*GPollFunc) (GPollFD *ufds, guint nfsd, gint timeout); struct _GPollFD { gint fd; gushort events; gushort revents; }; /* Standard priorities */ #define G_PRIORITY_HIGH -100 #define G_PRIORITY_DEFAULT 0 #define G_PRIORITY_HIGH_IDLE 100 #define G_PRIORITY_DEFAULT_IDLE 200 #define G_PRIORITY_LOW 300 /* GMainContext: */ GMainContext *g_main_context_get (GThread *thread); GMainContext *g_main_context_default (void); gboolean g_main_context_iteration (GMainContext *context, gboolean may_block); gboolean g_main_context_pending (GMainContext *context); /* For implementation of legacy interfaces */ GSource *g_main_context_find_source_by_id (GMainContext *context, guint id); GSource *g_main_context_find_source_by_user_data (GMainContext *context, gpointer user_data); GSource *g_main_context_find_source_by_funcs_user_data (GMainContext *context, GSourceFuncs *funcs, gpointer user_data); /* Low level functions for implementing custom main loops. */ gboolean g_main_context_prepare (GMainContext *context, gint *priority); gint g_main_context_query (GMainContext *context, gint max_priority, gint *timeout, GPollFD *fds, gint n_fds); gint g_main_context_check (GMainContext *context, gint max_priority, GPollFD *fds, gint n_fds); void g_main_context_dispatch (GMainContext *context); void g_main_context_set_poll_func (GMainContext *context, GPollFunc func); GPollFunc g_main_context_get_poll_func (GMainContext *context); /* Low level functions for use by source implementations */ void g_main_context_add_poll (GMainContext *context, GPollFD *fd, gint priority); void g_main_context_remove_poll (GMainContext *context, GPollFD *fd); /* GMainLoop: */ GMainLoop *g_main_loop_new (GMainContext *context, gboolean is_running); void g_main_loop_run (GMainLoop *loop); void g_main_loop_quit (GMainLoop *loop); GMainLoop *g_main_loop_ref (GMainLoop *loop); void g_main_loop_unref (GMainLoop *loop); gboolean g_main_loop_is_running (GMainLoop *loop); /* GSource: */ GSource *g_source_new (GSourceFuncs *source_funcs, guint struct_size); GSource *g_source_ref (GSource *source); void g_source_unref (GSource *source); guint g_source_attach (GSource *source, GMainContext *context); void g_source_destroy (GSource *source); void g_source_set_priority (GSource *source, gint priority); gint g_source_get_priority (GSource *source); void g_source_set_can_recurse (GSource *source, gboolean can_recurse); gboolean g_source_get_can_recurse (GSource *source); guint g_source_get_id (GSource *source); GMainContext *g_source_get_context (GSource *source); void g_source_set_callback (GSource *source, GSourceFunc func, gpointer data, GDestroyNotify notify); /* Used to implement g_source_connect_closure and internally*/ void g_source_set_callback_indirect (GSource *source, gpointer callback_data, GSourceCallbackFuncs *callback_funcs); void g_source_add_poll (GSource *source, GPollFD *fd); void g_source_remove_poll (GSource *source, GPollFD *fd); void g_source_get_current_time (GSource *source, GTimeVal *timeval); /* void g_source_connect_closure (GSource *source, GClosure *closure); */ /* Specific source types */ GSource *g_idle_source_new (void); GSource *g_timeout_source_new (guint interval); /* Miscellaneous functions */ void g_get_current_time (GTimeVal *result); /* ============== Compat main loop stuff ================== */ /* Legacy names for GMainLoop functions */ #define g_main_new(is_running) g_main_loop_new (NULL, is_running); #define g_main_run(loop) g_main_loop_run(loop) #define g_main_quit(loop) g_main_loop_quit(loop) #define g_main_destroy(loop) g_main_loop_unref(loop) #define g_main_is_running(loop) g_main_loop_is_running(loop) /* Source manipulation by ID */ gboolean g_source_remove (guint tag); gboolean g_source_remove_by_user_data (gpointer user_data); gboolean g_source_remove_by_funcs_user_data (GSourceFuncs *funcs, gpointer user_data); /* Functions to manipulate the default main loop */ #define g_main_iteration(may_block) g_main_context_iteration (NULL, may_block) #define g_main_pending() g_main_context_pending (NULL) #define g_main_set_poll_func(func) g_main_context_set_poll_func (NULL, func) /* Idles and timeouts */ guint g_timeout_add_full (gint priority, guint interval, GSourceFunc function, gpointer data, GDestroyNotify notify); guint g_timeout_add (guint interval, GSourceFunc function, gpointer data); guint g_idle_add (GSourceFunc function, gpointer data); guint g_idle_add_full (gint priority, GSourceFunc function, gpointer data, GDestroyNotify notify); gboolean g_idle_remove_by_data (gpointer data); #ifdef G_OS_WIN32 /* This is used to add polling for Windows messages. GDK (GTK+) programs * should *not* use this. */ void g_main_poll_win32_msg_add (gint priority, GPollFD *fd, guint hwnd); #endif /* G_OS_WIN32 */ G_END_DECLS #endif /* __G_MAIN_H__ */