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* Copyright (C) 2009 Google Inc. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef ThreadIdentifierDataPthreads_h
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#define ThreadIdentifierDataPthreads_h
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#include <wtf/Noncopyable.h>
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#include <wtf/Threading.h>
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// Holds ThreadIdentifier in the thread-specific storage and employs pthreads-specific 2-pass destruction to reliably remove
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// ThreadIdentifier from threadMap. It assumes regular ThreadSpecific types don't use multiple-pass destruction.
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class ThreadIdentifierData : public Noncopyable {
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~ThreadIdentifierData();
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// Creates and puts an instance of ThreadIdentifierData into thread-specific storage.
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static void initialize(ThreadIdentifier identifier);
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// Returns 0 if thread-specific storage was not initialized.
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static ThreadIdentifier identifier();
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ThreadIdentifierData(ThreadIdentifier identifier)
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: m_identifier(identifier)
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, m_isDestroyedOnce(false)
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// This thread-specific destructor is called 2 times when thread terminates:
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// - first, when all the other thread-specific destructors are called, it simply remembers it was 'destroyed once'
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// and re-sets itself into the thread-specific slot to make Pthreads to call it again later.
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// - second, after all thread-specific destructors were invoked, it gets called again - this time, we remove the
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// ThreadIdentifier from the threadMap, completing the cleanup.
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static void destruct(void* data);
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static void initializeKeyOnceHelper();
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static void initializeKeyOnce();
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ThreadIdentifier m_identifier;
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bool m_isDestroyedOnce;
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static pthread_key_t m_key;
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#endif // ThreadIdentifierDataPthreads_h