/*

 * Copyright (C) 2009 Google Inc. 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 Google Inc. 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

 * OWNER 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 "config.h"

#if USE(PTHREADS)

#include "ThreadIdentifierDataPthreads.h"

#include "Threading.h"

namespace WTF {

pthread_key_t ThreadIdentifierData::m_key;

void clearPthreadHandleForIdentifier(ThreadIdentifier);

ThreadIdentifierData::~ThreadIdentifierData()

{

    clearPthreadHandleForIdentifier(m_identifier);

}

ThreadIdentifier ThreadIdentifierData::identifier()

{

    initializeKeyOnce();

    ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(pthread_getspecific(m_key));

    return threadIdentifierData ? threadIdentifierData->m_identifier : 0;

}

void ThreadIdentifierData::initialize(ThreadIdentifier id)

{

    ASSERT(!identifier());

    initializeKeyOnce();

    pthread_setspecific(m_key, new ThreadIdentifierData(id));

}

void ThreadIdentifierData::destruct(void* data)

{

    ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(data);

    ASSERT(threadIdentifierData);

    if (threadIdentifierData->m_isDestroyedOnce) {

        delete threadIdentifierData;

        return;

    }

    threadIdentifierData->m_isDestroyedOnce = true;

    // Re-setting the value for key causes another destruct() call after all other thread-specific destructors were called.

    pthread_setspecific(m_key, threadIdentifierData);

}

void ThreadIdentifierData::initializeKeyOnceHelper()

{

    if (pthread_key_create(&m_key, destruct))

        CRASH();

}

void ThreadIdentifierData::initializeKeyOnce()

{

    static pthread_once_t onceControl = PTHREAD_ONCE_INIT;

    if (pthread_once(&onceControl, initializeKeyOnceHelper))

        CRASH();

}

} // namespace WTF

#endif // USE(PTHREADS)