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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* gmutex.c: MT safety related functions
* Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe
* Owen Taylor
*
* 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.
*/
/*
* MT safe
*/
#include "glib.h"
typedef struct _GStaticPrivateNode GStaticPrivateNode;
struct _GStaticPrivateNode {
gpointer data;
GDestroyNotify destroy;
};
static void g_static_private_free_data (gpointer data);
static void g_thread_fail (void);
/* Global variables */
gboolean g_thread_use_default_impl = TRUE;
gboolean g_threads_got_initialized = FALSE;
GThreadFunctions g_thread_functions_for_glib_use = {
(GMutex*(*)())g_thread_fail, /* mutex_new */
NULL, /* mutex_lock */
NULL, /* mutex_trylock */
NULL, /* mutex_unlock */
NULL, /* mutex_free */
(GCond*(*)())g_thread_fail, /* cond_new */
NULL, /* cond_signal */
NULL, /* cond_broadcast */
NULL, /* cond_wait */
NULL, /* cond_timed_wait */
NULL, /* cond_free */
(GPrivate*(*)(GDestroyNotify))g_thread_fail, /* private_new */
NULL, /* private_get */
NULL, /* private_set */
};
/* Local data */
static GMutex *g_mutex_protect_static_mutex_allocation = NULL;
static GMutex *g_thread_specific_mutex = NULL;
static GPrivate *g_thread_specific_private = NULL;
/* This must be called only once, before any threads are created.
* It will only be called from g_thread_init() in -lgthread.
*/
void
g_mutex_init (void)
{
/* We let the main thread (the one that calls g_thread_init) inherit
the data, that it set before calling g_thread_init */
gpointer private_old = g_thread_specific_private;
g_thread_specific_private = g_private_new (g_static_private_free_data);
/* we can not use g_private_set here, as g_threads_got_initialized is not
yet set TRUE, whereas the private_set function is already set. */
g_thread_functions_for_glib_use.private_set (g_thread_specific_private,
private_old);
g_mutex_protect_static_mutex_allocation = g_mutex_new();
g_thread_specific_mutex = g_mutex_new();
}
GMutex *
g_static_mutex_get_mutex_impl (GMutex** mutex)
{
if (!g_thread_supported ())
return NULL;
g_assert (g_mutex_protect_static_mutex_allocation);
g_mutex_lock (g_mutex_protect_static_mutex_allocation);
if (!(*mutex))
*mutex = g_mutex_new();
g_mutex_unlock (g_mutex_protect_static_mutex_allocation);
return *mutex;
}
gpointer
g_static_private_get (GStaticPrivate *private_key)
{
GArray *array;
array = g_private_get (g_thread_specific_private);
if (!array)
return NULL;
if (!private_key->index)
return NULL;
else if (private_key->index <= array->len)
return g_array_index (array, GStaticPrivateNode, (private_key->index - 1)).data;
else
return NULL;
}
void
g_static_private_set (GStaticPrivate *private_key,
gpointer data,
GDestroyNotify notify)
{
GArray *array;
static guint next_index = 0;
array = g_private_get (g_thread_specific_private);
if (!array)
{
array = g_array_new (FALSE, FALSE, sizeof(GStaticPrivateNode));
g_private_set (g_thread_specific_private, array);
}
if (!private_key->index)
{
g_mutex_lock (g_thread_specific_mutex);
if (!private_key->index)
private_key->index = ++next_index;
g_mutex_unlock (g_thread_specific_mutex);
}
if (private_key->index > array->len)
g_array_set_size (array, private_key->index);
g_array_index (array, GStaticPrivateNode, (private_key->index - 1)).data = data;
g_array_index (array, GStaticPrivateNode, (private_key->index - 1)).destroy = notify;
}
static void
g_static_private_free_data (gpointer data)
{
if (data)
{
GArray* array = data;
guint i;
for (i = 0; i < array->len; i++ )
{
GStaticPrivateNode *node = &g_array_index (array, GStaticPrivateNode, i);
if (node->data && node->destroy)
node->destroy (node->data);
}
}
}
static void
g_thread_fail (void)
{
g_error ("The thread system is not yet initialized.");
}
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