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/**************************************************************************\
*
* This file is part of the Coin 3D visualization library.
* Copyright (C) by Kongsberg Oil & Gas Technologies.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* ("GPL") version 2 as published by the Free Software Foundation.
* See the file LICENSE.GPL at the root directory of this source
* distribution for additional information about the GNU GPL.
*
* For using Coin with software that can not be combined with the GNU
* GPL, and for taking advantage of the additional benefits of our
* support services, please contact Kongsberg Oil & Gas Technologies
* about acquiring a Coin Professional Edition License.
*
* See http://www.coin3d.org/ for more information.
*
* Kongsberg Oil & Gas Technologies, Bygdoy Alle 5, 0257 Oslo, NORWAY.
* http://www.sim.no/ sales@sim.no coin-support@coin3d.org
*
\**************************************************************************/
#include <Inventor/C/threads/sync.h>
#include <stddef.h>
#include <Inventor/C/threads/mutex.h>
#include "tidbitsp.h"
#include "base/dict.h"
#include "threads/syncp.h"
#include "threads/mutexp.h"
/* ********************************************************************** */
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
static cc_dict * sync_hash_table = NULL;
static void
sync_hash_cb(uintptr_t key, void * val, void * closure)
{
cc_mutex_destruct((cc_mutex*) val);
}
static void
sync_cleanup(void)
{
cc_dict_apply(sync_hash_table, sync_hash_cb, NULL);
cc_dict_destruct(sync_hash_table);
sync_hash_table = NULL;
}
/*
Initialize synchronizer. Should only be called once, from SoDB::init()
*/
void
cc_sync_init(void)
{
if (sync_hash_table == NULL) {
/* the priority is set so to make this callback trigger late,
after normal cleanup function which might still use a cc_sync
instance */
coin_atexit((coin_atexit_f*) sync_cleanup, CC_ATEXIT_THREADING_SUBSYSTEM);
sync_hash_table = cc_dict_construct(256, 0.75f);
}
}
/*!
Begin synchronizing \a id. After returning from this call, other
threads trying to synchronize \a id will be blocked until the first
thread calls cc_sync_end() with the key returned from this function.
*/
void *
cc_sync_begin(void * id)
{
void * mutex;
cc_mutex_global_lock();
if (sync_hash_table == NULL) {
cc_sync_init();
}
if (!cc_dict_get(sync_hash_table, (uintptr_t)id, &mutex)) {
mutex = (void*) cc_mutex_construct();
(void) cc_dict_put(sync_hash_table, (uintptr_t)id, mutex);
}
cc_mutex_global_unlock();
cc_mutex_lock((cc_mutex*) mutex);
return mutex;
}
/*!
End synchronize. \a key should be the key returned from cc_sync_begin().
*/
void
cc_sync_end(void * key)
{
cc_mutex_unlock((cc_mutex*) key);
}
/*!
Free sync item. This can be called from the destructor of objects
that use a sync item so that the sync-mutex is freed when the object
is destructed.
\since Coin 2.3
*/
void
cc_sync_free(void * id)
{
void * mutex;
cc_mutex_global_lock();
if (sync_hash_table == NULL) {
cc_sync_init();
}
if (cc_dict_get(sync_hash_table, (uintptr_t)id, &mutex)) {
cc_mutex_destruct((cc_mutex*) mutex);
cc_dict_remove(sync_hash_table, (uintptr_t)id);
}
cc_mutex_global_unlock();
}
#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */
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