1 /* gmain.h - the GLib Main loop
2 * Copyright (C) 1998-2000 Red Hat, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
28 typedef struct _GMainContext GMainContext; /* Opaque */
29 typedef struct _GMainLoop GMainLoop; /* Opaque */
30 typedef struct _GSource GSource;
31 typedef struct _GSourceCallbackFuncs GSourceCallbackFuncs;
32 typedef struct _GSourceFuncs GSourceFuncs;
34 typedef gboolean (*GSourceFunc) (gpointer data);
39 gpointer callback_data;
40 GSourceCallbackFuncs *callback_funcs;
42 GSourceFuncs *source_funcs;
45 GMainContext *context;
57 struct _GSourceCallbackFuncs
59 void (*ref) (gpointer cb_data);
60 void (*unref) (gpointer cb_data);
61 void (*get) (gpointer cb_data,
68 gboolean (*prepare) (GSource *source,
70 gboolean (*check) (GSource *source);
71 gboolean (*dispatch) (GSource *source,
74 void (*destroy) (GSource *source); /* Can be NULL */
77 /* Any definitions using GPollFD or GPollFunc are primarily
78 * for Unix and not guaranteed to be the compatible on all
79 * operating systems on which GLib runs. Right now, the
80 * GLib does use these functions on Win32 as well, but interprets
81 * them in a fairly different way than on Unix. If you use
82 * these definitions, you are should be prepared to recode
83 * for different operating systems.
86 * On Win32, the fd in a GPollFD should be Win32 HANDLE (*not* a file
87 * descriptor as provided by the C runtime) that can be used by
88 * MsgWaitForMultipleObjects. This does *not* include file handles
89 * from CreateFile, SOCKETs, nor pipe handles. (But you can use
90 * WSAEventSelect to signal events when a SOCKET is readable).
92 * On Win32, fd can also be the special value G_WIN32_MSG_HANDLE to
93 * indicate polling for messages. These message queue GPollFDs should
94 * be added with the g_main_poll_win32_msg_add function.
96 * But note that G_WIN32_MSG_HANDLE GPollFDs should not be used by GDK
97 * (GTK) programs, as GDK itself wants to read messages and convert them
100 * So, unless you really know what you are doing, it's best not to try
101 * to use the main loop polling stuff for your own needs on
102 * Win32. It's really only written for the GIMP's needs so
105 typedef struct _GPollFD GPollFD;
106 typedef gint (*GPollFunc) (GPollFD *ufds,
117 /* Standard priorities */
119 #define G_PRIORITY_HIGH -100
120 #define G_PRIORITY_DEFAULT 0
121 #define G_PRIORITY_HIGH_IDLE 100
122 #define G_PRIORITY_DEFAULT_IDLE 200
123 #define G_PRIORITY_LOW 300
127 GMainContext *g_main_context_get (GThread *thread);
128 GMainContext *g_main_context_default (void);
130 gboolean g_main_context_iteration (GMainContext *context,
132 gboolean g_main_context_pending (GMainContext *context);
134 /* For implementation of legacy interfaces
136 GSource *g_main_context_find_source_by_id (GMainContext *context,
138 GSource *g_main_context_find_source_by_user_data (GMainContext *context,
140 GSource *g_main_context_find_source_by_funcs_user_data (GMainContext *context,
144 /* Low level functions for implementing custom main loops.
146 gboolean g_main_context_prepare (GMainContext *context,
148 gint g_main_context_query (GMainContext *context,
153 gint g_main_context_check (GMainContext *context,
157 void g_main_context_dispatch (GMainContext *context);
159 void g_main_context_set_poll_func (GMainContext *context,
161 GPollFunc g_main_context_get_poll_func (GMainContext *context);
163 /* Low level functions for use by source implementations
165 void g_main_context_add_poll (GMainContext *context,
168 void g_main_context_remove_poll (GMainContext *context,
173 GMainLoop *g_main_loop_new (GMainContext *context,
174 gboolean is_running);
175 void g_main_loop_run (GMainLoop *loop);
176 void g_main_loop_quit (GMainLoop *loop);
177 void g_main_loop_destroy (GMainLoop *loop);
178 gboolean g_main_loop_is_running (GMainLoop *loop);
182 GSource *g_source_new (GSourceFuncs *source_funcs,
184 GSource *g_source_ref (GSource *source);
185 void g_source_unref (GSource *source);
187 guint g_source_attach (GSource *source,
188 GMainContext *context);
189 void g_source_destroy (GSource *source);
191 void g_source_set_priority (GSource *source,
193 gint g_source_get_priority (GSource *source);
194 void g_source_set_can_recurse (GSource *source,
195 gboolean can_recurse);
196 gboolean g_source_get_can_recurse (GSource *source);
197 guint g_source_get_id (GSource *source);
199 GMainContext *g_source_get_context (GSource *source);
201 void g_source_set_callback (GSource *source,
204 GDestroyNotify notify);
207 /* Used to implement g_source_connect_closure and internally*/
208 void g_source_set_callback_indirect (GSource *source,
209 gpointer callback_data,
210 GSourceCallbackFuncs *callback_funcs);
212 void g_source_add_poll (GSource *source,
214 void g_source_remove_poll (GSource *source,
217 void g_source_get_current_time (GSource *source,
220 /* void g_source_connect_closure (GSource *source,
224 /* Specific source types
226 GSource *g_idle_source_new (void);
227 GSource *g_timeout_source_new (guint interval);
229 /* Miscellaneous functions
231 void g_get_current_time (GTimeVal *result);
233 /* ============== Compat main loop stuff ================== */
235 /* Legacy names for GMainLoop functions
237 #define g_main_new(is_running) g_main_loop_new (NULL, is_running);
238 #define g_main_run(loop) g_main_loop_run(loop)
239 #define g_main_quit(loop) g_main_loop_quit(loop)
240 #define g_main_destroy(loop) g_main_loop_destroy(loop)
241 #define g_main_is_running(loop) g_main_loop_is_running(loop)
243 /* Source manipulation by ID */
244 gboolean g_source_remove (guint tag);
245 gboolean g_source_remove_by_user_data (gpointer user_data);
246 gboolean g_source_remove_by_funcs_user_data (GSourceFuncs *funcs,
249 /* Functions to manipulate the default main loop
252 #define g_main_iteration(may_block) g_main_context_iteration (NULL, may_block)
253 #define g_main_pending() g_main_context_pending (NULL)
255 #define g_main_set_poll_func(func) g_main_context_set_poll_func (NULL, func)
257 /* Idles and timeouts */
258 guint g_timeout_add_full (gint priority,
260 GSourceFunc function,
262 GDestroyNotify notify);
263 guint g_timeout_add (guint interval,
264 GSourceFunc function,
266 guint g_idle_add (GSourceFunc function,
268 guint g_idle_add_full (gint priority,
269 GSourceFunc function,
271 GDestroyNotify notify);
272 gboolean g_idle_remove_by_data (gpointer data);
276 /* This is used to add polling for Windows messages. GDK (GTK+) programs
277 * should *not* use this.
279 void g_main_poll_win32_msg_add (gint priority,
282 #endif /* G_OS_WIN32 */
286 #endif /* __G_MAIN_H__ */