glib/gmain.h

   1 /* gmain.h - the GLib Main loop
   2  * Copyright (C) 1998-2000 Red Hat, Inc.
   3  *
   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.
   8  *
   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.
  13  *
  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.
  18  */
  19
  20 #ifndef __G_MAIN_H__
  21 #define __G_MAIN_H__
  22
  23 #include <glib/gslist.h>
  24 #include <glib/gthread.h>
  25
  26 G_BEGIN_DECLS
  27
  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;
  33
  34 typedef gboolean (*GSourceFunc)       (gpointer data);
  35
  36 struct _GSource
  37 {
  38   /*< private >*/
  39   gpointer callback_data;
  40   GSourceCallbackFuncs *callback_funcs;
  41
  42   GSourceFuncs *source_funcs;
  43   guint ref_count;
  44
  45   GMainContext *context;
  46
  47   gint priority;
  48   guint flags;
  49   guint source_id;
  50
  51   GSList *poll_fds;
  52
  53   GSource *prev;
  54   GSource *next;
  55
  56   gpointer reserved1;
  57   gpointer reserved2;
  58 };
  59
  60 struct _GSourceCallbackFuncs
  61 {
  62   void (*ref)   (gpointer     cb_data);
  63   void (*unref) (gpointer     cb_data);
  64   void (*get)   (gpointer     cb_data,
  65                  GSource     *source,
  66                  GSourceFunc *func,
  67                  gpointer    *data);
  68 };
  69
  70 typedef void (*GSourceDummyMarshal) (void);
  71
  72 struct _GSourceFuncs
  73 {
  74   gboolean (*prepare)  (GSource    *source,
  75                         gint       *timeout_);
  76   gboolean (*check)    (GSource    *source);
  77   gboolean (*dispatch) (GSource    *source,
  78                         GSourceFunc callback,
  79                         gpointer    user_data);
  80   void     (*finalize) (GSource    *source); /* Can be NULL */
  81
  82   /* For use by g_source_set_closure */
  83   GSourceFunc     closure_callback;
  84   GSourceDummyMarshal closure_marshal; /* Really is of type GClosureMarshal */
  85 };
  86
  87 /* Any definitions using GPollFD or GPollFunc are primarily
  88  * for Unix and not guaranteed to be the compatible on all
  89  * operating systems on which GLib runs. Right now, the
  90  * GLib does use these functions on Win32 as well, but interprets
  91  * them in a fairly different way than on Unix. If you use
  92  * these definitions, you are should be prepared to recode
  93  * for different operating systems.
  94  *
  95  *
  96  * On Win32, the fd in a GPollFD should be Win32 HANDLE (*not* a file
  97  * descriptor as provided by the C runtime) that can be used by
  98  * MsgWaitForMultipleObjects. This does *not* include file handles
  99  * from CreateFile, SOCKETs, nor pipe handles. (But you can use
 100  * WSAEventSelect to signal events when a SOCKET is readable).
 101  *
 102  * On Win32, fd can also be the special value G_WIN32_MSG_HANDLE to
 103  * indicate polling for messages. These message queue GPollFDs should
 104  * be added with the g_main_poll_win32_msg_add function.
 105  *
 106  * But note that G_WIN32_MSG_HANDLE GPollFDs should not be used by GDK
 107  * (GTK) programs, as GDK itself wants to read messages and convert them
 108  * to GDK events.
 109  *
 110  * So, unless you really know what you are doing, it's best not to try
 111  * to use the main loop polling stuff for your own needs on
 112  * Win32. It's really only written for the GIMP's needs so
 113  * far.
 114  */
 115 typedef struct _GPollFD GPollFD;
 116 typedef gint    (*GPollFunc)    (GPollFD *ufds,
 117                                  guint    nfsd,
 118                                  gint     timeout_);
 119
 120 struct _GPollFD
 121 {
 122   gint          fd;
 123   gushort       events;
 124   gushort       revents;
 125 };
 126
 127 /* Standard priorities */
 128
 129 #define G_PRIORITY_HIGH            -100
 130 #define G_PRIORITY_DEFAULT          0
 131 #define G_PRIORITY_HIGH_IDLE        100
 132 #define G_PRIORITY_DEFAULT_IDLE     200
 133 #define G_PRIORITY_LOW              300
 134
 135 /* GMainContext: */
 136
 137 GMainContext *g_main_context_new       (void);
 138 void          g_main_context_ref       (GMainContext *context);
 139 void          g_main_context_unref     (GMainContext *context);
 140 GMainContext *g_main_context_default   (void);
 141
 142 gboolean      g_main_context_iteration (GMainContext *context,
 143                                         gboolean      may_block);
 144 gboolean      g_main_context_pending   (GMainContext *context);
 145
 146 /* For implementation of legacy interfaces
 147  */
 148 GSource      *g_main_context_find_source_by_id              (GMainContext *context,
 149                                                              guint         source_id);
 150 GSource      *g_main_context_find_source_by_user_data       (GMainContext *context,
 151                                                              gpointer      user_data);
 152 GSource      *g_main_context_find_source_by_funcs_user_data (GMainContext *context,
 153                                                              GSourceFuncs *funcs,
 154                                                              gpointer      user_data);
 155
 156 /* Low level functions for implementing custom main loops.
 157  */
 158 void     g_main_context_wakeup  (GMainContext *context);
 159 gboolean g_main_context_acquire (GMainContext *context);
 160 void     g_main_context_release (GMainContext *context);
 161 gboolean g_main_context_wait    (GMainContext *context,
 162                                  GCond        *cond,
 163                                  GMutex       *mutex);
 164
 165 gboolean g_main_context_prepare  (GMainContext *context,
 166                                   gint         *priority);
 167 gint     g_main_context_query    (GMainContext *context,
 168                                   gint          max_priority,
 169                                   gint         *timeout_,
 170                                   GPollFD      *fds,
 171                                   gint          n_fds);
 172 gint     g_main_context_check    (GMainContext *context,
 173                                   gint          max_priority,
 174                                   GPollFD      *fds,
 175                                   gint          n_fds);
 176 void     g_main_context_dispatch (GMainContext *context);
 177
 178 void      g_main_context_set_poll_func (GMainContext *context,
 179                                         GPollFunc     func);
 180 GPollFunc g_main_context_get_poll_func (GMainContext *context);
 181
 182 /* Low level functions for use by source implementations
 183  */
 184 void g_main_context_add_poll      (GMainContext *context,
 185                                    GPollFD      *fd,
 186                                    gint          priority);
 187 void g_main_context_remove_poll   (GMainContext *context,
 188                                    GPollFD      *fd);
 189
 190 /* GMainLoop: */
 191
 192 GMainLoop *g_main_loop_new        (GMainContext *context,
 193                                    gboolean      is_running);
 194 void       g_main_loop_run        (GMainLoop    *loop);
 195 void       g_main_loop_quit       (GMainLoop    *loop);
 196 GMainLoop *g_main_loop_ref        (GMainLoop    *loop);
 197 void       g_main_loop_unref      (GMainLoop    *loop);
 198 gboolean   g_main_loop_is_running (GMainLoop    *loop);
 199 GMainContext *g_main_loop_get_context (GMainLoop    *loop);
 200
 201 /* GSource: */
 202
 203 GSource *g_source_new             (GSourceFuncs   *source_funcs,
 204                                    guint           struct_size);
 205 GSource *g_source_ref             (GSource        *source);
 206 void     g_source_unref           (GSource        *source);
 207
 208 guint    g_source_attach          (GSource        *source,
 209                                    GMainContext   *context);
 210 void     g_source_destroy         (GSource        *source);
 211
 212 void     g_source_set_priority    (GSource        *source,
 213                                    gint            priority);
 214 gint     g_source_get_priority    (GSource        *source);
 215 void     g_source_set_can_recurse (GSource        *source,
 216                                    gboolean        can_recurse);
 217 gboolean g_source_get_can_recurse (GSource        *source);
 218 guint    g_source_get_id          (GSource        *source);
 219
 220 GMainContext *g_source_get_context (GSource       *source);
 221
 222 void g_source_set_callback          (GSource              *source,
 223                                      GSourceFunc           func,
 224                                      gpointer              data,
 225                                      GDestroyNotify        notify);
 226
 227
 228 /* Used to implement g_source_connect_closure and internally*/
 229 void g_source_set_callback_indirect (GSource              *source,
 230                                      gpointer              callback_data,
 231                                      GSourceCallbackFuncs *callback_funcs);
 232
 233 void     g_source_add_poll         (GSource        *source,
 234                                     GPollFD        *fd);
 235 void     g_source_remove_poll      (GSource        *source,
 236                                     GPollFD        *fd);
 237
 238 void     g_source_get_current_time (GSource        *source,
 239                                     GTimeVal       *timeval);
 240
 241  /* void g_source_connect_closure (GSource        *source,
 242                                   GClosure       *closure);
 243  */
 244
 245 /* Specific source types
 246  */
 247 GSource *g_idle_source_new    (void);
 248 GSource *g_timeout_source_new (guint         interval);
 249
 250 /* Miscellaneous functions
 251  */
 252 void g_get_current_time                 (GTimeVal       *result);
 253
 254 /* ============== Compat main loop stuff ================== */
 255
 256 #ifndef G_DISABLE_DEPRECATED
 257
 258 /* Legacy names for GMainLoop functions
 259  */
 260 #define         g_main_new(is_running)  g_main_loop_new (NULL, is_running);
 261 #define         g_main_run(loop)        g_main_loop_run(loop)
 262 #define         g_main_quit(loop)       g_main_loop_quit(loop)
 263 #define         g_main_destroy(loop)    g_main_loop_unref(loop)
 264 #define         g_main_is_running(loop) g_main_loop_is_running(loop)
 265
 266 /* Functions to manipulate the default main loop
 267  */
 268
 269 #define g_main_iteration(may_block) g_main_context_iteration      (NULL, may_block)
 270 #define g_main_pending()            g_main_context_pending        (NULL)
 271
 272 #define g_main_set_poll_func(func)   g_main_context_set_poll_func (NULL, func)
 273
 274 #endif /* G_DISABLE_DEPRECATED */
 275
 276 /* Source manipulation by ID */
 277 gboolean g_source_remove                     (guint          tag);
 278 gboolean g_source_remove_by_user_data        (gpointer       user_data);
 279 gboolean g_source_remove_by_funcs_user_data  (GSourceFuncs  *funcs,
 280                                               gpointer       user_data);
 281
 282 /* Idles and timeouts */
 283 guint           g_timeout_add_full      (gint           priority,
 284                                          guint          interval,
 285                                          GSourceFunc    function,
 286                                          gpointer       data,
 287                                          GDestroyNotify notify);
 288 guint           g_timeout_add           (guint          interval,
 289                                          GSourceFunc    function,
 290                                          gpointer       data);
 291 guint           g_idle_add              (GSourceFunc    function,
 292                                          gpointer       data);
 293 guint           g_idle_add_full         (gint           priority,
 294                                          GSourceFunc    function,
 295                                          gpointer       data,
 296                                          GDestroyNotify notify);
 297 gboolean        g_idle_remove_by_data   (gpointer       data);
 298
 299 /* Hook for GClosure / GSource integration. Don't touch */
 300 GLIB_VAR GSourceFuncs g_timeout_funcs;
 301 GLIB_VAR GSourceFuncs g_idle_funcs;
 302
 303 #ifdef G_OS_WIN32
 304
 305 /* This is used to add polling for Windows messages. GDK (GTK+) programs
 306  * should *not* use this.
 307  */
 308 void        g_main_poll_win32_msg_add (gint        priority,
 309                                        GPollFD    *fd,
 310                                        guint       hwnd);
 311 #endif /* G_OS_WIN32 */
 312
 313 G_END_DECLS
 314
 315 #endif /* __G_MAIN_H__ */