/* | |
* Copyright (C) 2009 Google Inc. All rights reserved. | |
* | |
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* modification, are permitted provided that the following conditions are | |
* met: | |
* | |
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* notice, this list of conditions and the following disclaimer. | |
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* 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 | |
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* this software without specific prior written permission. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
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*/ | |
#ifndef ThreadIdentifierDataPthreads_h | |
#define ThreadIdentifierDataPthreads_h | |
#include <wtf/Noncopyable.h> | |
#include <wtf/Threading.h> | |
namespace WTF { | |
// Holds ThreadIdentifier in the thread-specific storage and employs pthreads-specific 2-pass destruction to reliably remove | |
// ThreadIdentifier from threadMap. It assumes regular ThreadSpecific types don't use multiple-pass destruction. | |
class ThreadIdentifierData : public Noncopyable { | |
public: | |
~ThreadIdentifierData(); | |
// Creates and puts an instance of ThreadIdentifierData into thread-specific storage. | |
static void initialize(ThreadIdentifier identifier); | |
// Returns 0 if thread-specific storage was not initialized. | |
static ThreadIdentifier identifier(); | |
private: | |
ThreadIdentifierData(ThreadIdentifier identifier) | |
: m_identifier(identifier) | |
, m_isDestroyedOnce(false) | |
{ | |
} | |
// This thread-specific destructor is called 2 times when thread terminates: | |
// - first, when all the other thread-specific destructors are called, it simply remembers it was 'destroyed once' | |
// and re-sets itself into the thread-specific slot to make Pthreads to call it again later. | |
// - second, after all thread-specific destructors were invoked, it gets called again - this time, we remove the | |
// ThreadIdentifier from the threadMap, completing the cleanup. | |
static void destruct(void* data); | |
static void initializeKeyOnceHelper(); | |
static void initializeKeyOnce(); | |
ThreadIdentifier m_identifier; | |
bool m_isDestroyedOnce; | |
static pthread_key_t m_key; | |
}; | |
} // namespace WTF | |
#endif // ThreadIdentifierDataPthreads_h | |