sky/engine/wtf/ThreadIdentifierDataPthreads.cpp

/*
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#include "sky/engine/wtf/ThreadIdentifierDataPthreads.h"

#include "sky/engine/wtf/Assertions.h"
#include "sky/engine/wtf/WTF.h"

#include <limits.h>

#if USE(PTHREADS)

// PTHREAD_KEYS_MAX might be not defined (e.g. in certain bionic versions), so explicitly define it here.
#ifndef PTHREAD_KEYS_MAX
#define PTHREAD_KEYS_MAX 1024
#endif // PTHREAD_KEYS_MAX

namespace WTF {

pthread_key_t ThreadIdentifierData::m_key = PTHREAD_KEYS_MAX;

void threadDidExit(ThreadIdentifier);

ThreadIdentifierData::~ThreadIdentifierData()
{
    threadDidExit(m_identifier);
}

void ThreadIdentifierData::initializeOnce()
{
    if (pthread_key_create(&m_key, destruct))
        CRASH();
}

ThreadIdentifier ThreadIdentifierData::identifier()
{
    ASSERT(m_key != PTHREAD_KEYS_MAX);
    ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(pthread_getspecific(m_key));

    return threadIdentifierData ? threadIdentifierData->m_identifier : 0;
}

void ThreadIdentifierData::initialize(ThreadIdentifier id)
{
    ASSERT(!identifier());
    pthread_setspecific(m_key, new ThreadIdentifierData(id));
}

void ThreadIdentifierData::destruct(void* data)
{
    if (isShutdown())
        return;

    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);
}

} // namespace WTF

#endif // USE(PTHREADS)