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Coin / src / threads / sync.cpp

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Lars J. Aas 92263e4 
Marius Kintel 3ba6b41 




























Lars J. Aas 92263e4 


Jostein 62cd825 
Lars J. Aas 92263e4 





Lars J. Aas f5e3a88 
Lars J. Aas 92263e4 











Jostein 62cd825 
Lars J. Aas 92263e4 























































































/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\**************************************************************************/

#include <Inventor/C/threads/sync.h>
#include "coindefs.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 COIN_UNUSED_ARG(key), void * val, void * COIN_UNUSED_ARG(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 */