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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* gthread.c: thread related functions
* Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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 1997-2000. 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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <glib.h>
static gboolean thread_system_already_initialized = FALSE;
static gint g_thread_map_priority (GThreadPriority priority);
static gint g_thread_min_priority = 0;
static gint g_thread_max_priority = 0;
#include G_THREAD_SOURCE
void g_mutex_init (void);
void g_mem_init (void);
void g_messages_init (void);
void
g_thread_init (GThreadFunctions* init)
{
gboolean supported;
#ifndef G_THREADS_ENABLED
g_error ("GLib thread support is disabled.");
#endif /* !G_THREADS_ENABLED */
if (thread_system_already_initialized)
g_error ("GThread system may only be initialized once.");
thread_system_already_initialized = TRUE;
if (init == NULL)
init = &g_thread_functions_for_glib_use_default;
else
g_thread_use_default_impl = FALSE;
#if defined (G_OS_WIN32) && defined (__GNUC__)
memcpy(&g_thread_functions_for_glib_use, init, sizeof (*init));
#else
g_thread_functions_for_glib_use = *init;
#endif
/* It is important, that g_threads_got_initialized is not set before the
* thread initialization functions of the different modules are called
*/
supported = (init->mutex_new &&
init->mutex_lock &&
init->mutex_trylock &&
init->mutex_unlock &&
init->mutex_free &&
init->cond_new &&
init->cond_signal &&
init->cond_broadcast &&
init->cond_wait &&
init->cond_timed_wait &&
init->cond_free &&
init->private_new &&
init->private_get &&
init->private_get);
/* if somebody is calling g_thread_init (), it means that he wants to
* have thread support, so check this
*/
if (!supported)
{
if (g_thread_use_default_impl)
g_error ("Threads are not supported on this platform.");
else
g_error ("The supplied thread function vector is invalid.");
}
/* now do any initialization stuff required by the implementation,
* but only if called with a NULL argument, of course. Otherwise
* it's up to the user to do so. */
#ifdef HAVE_G_THREAD_IMPL_INIT
if (g_thread_use_default_impl)
g_thread_impl_init();
#endif
/* now call the thread initialization functions of the different
* glib modules. order does matter, g_mutex_init MUST come first.
*/
g_mutex_init ();
g_mem_init ();
g_messages_init ();
/* now we can set g_threads_got_initialized and thus enable
* all the thread functions
*/
g_threads_got_initialized = TRUE;
/* we want the main thread to run with normal priority */
g_thread_set_priority (g_thread_self(), G_THREAD_PRIORITY_NORMAL);
}
static gint
g_thread_map_priority (GThreadPriority priority)
{
guint procent;
switch (priority)
{
case G_THREAD_PRIORITY_LOW: procent = 0; break;
default: case G_THREAD_PRIORITY_NORMAL: procent = 40; break;
case G_THREAD_PRIORITY_HIGH: procent = 80; break;
case G_THREAD_PRIORITY_URGENT: procent = 100; break;
}
return g_thread_min_priority +
(g_thread_max_priority - g_thread_min_priority) * procent / 100;
}
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