release/src/router/glib/gthread/gthread.c

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * gthread.c: thread related functions
   5  * Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public
  18  * License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22
  23 /*
  24  * Modified by the GLib Team and others 1997-1999.  See the AUTHORS
  25  * file for a list of people on the GLib Team.  See the ChangeLog
  26  * files for a list of changes.  These files are distributed with
  27  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  28  */
  29
  30 /*
  31  * MT safe
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 #endif
  37
  38 #include <glib.h>
  39
  40 static gboolean thread_system_already_initialized = FALSE;
  41
  42 #include G_THREAD_SOURCE
  43
  44 void g_mutex_init (void);
  45 void g_mem_init (void);
  46 void g_messages_init (void);
  47
  48 void
  49 g_thread_init (GThreadFunctions* init)
  50 {
  51   gboolean supported;
  52
  53 #ifndef G_THREADS_ENABLED
  54   g_error ("GLib thread support is disabled.");
  55 #endif  /* !G_THREADS_ENABLED */
  56
  57   if (thread_system_already_initialized)
  58     g_error ("GThread system may only be initialized once.");
  59
  60   thread_system_already_initialized = TRUE;
  61
  62   if (init == NULL)
  63     init = &g_thread_functions_for_glib_use_default;
  64   else
  65     g_thread_use_default_impl = FALSE;
  66
  67   g_thread_functions_for_glib_use = *init;
  68
  69   /* It is important, that g_threads_got_initialized is not set before the
  70    * thread initialization functions of the different modules are called
  71    */
  72
  73   supported = (init->mutex_new &&
  74                init->mutex_lock &&
  75                init->mutex_trylock &&
  76                init->mutex_unlock &&
  77                init->mutex_free &&
  78                init->cond_new &&
  79                init->cond_signal &&
  80                init->cond_broadcast &&
  81                init->cond_wait &&
  82                init->cond_timed_wait &&
  83                init->cond_free &&
  84                init->private_new &&
  85                init->private_get &&
  86                init->private_get);
  87
  88   /* if somebody is calling g_thread_init (), it means that he wants to
  89    * have thread support, so check this
  90    */
  91   if (!supported)
  92     {
  93       if (g_thread_use_default_impl)
  94         g_error ("Threads are not supported on this platform.");
  95       else
  96         g_error ("The supplied thread function vector is invalid.");
  97     }
  98
  99   /* now call the thread initialization functions of the different
 100    * glib modules. order does matter, g_mutex_init MUST come first.
 101    */
 102   g_mutex_init ();
 103   g_mem_init ();
 104   g_messages_init ();
 105
 106   /* now we can set g_threads_got_initialized and thus enable
 107    * all the thread functions
 108    */
 109   g_threads_got_initialized = TRUE;
 110 }