text: /**
   * Appcelerator Titanium License
   * This source code and all modifications done by Appcelerator
   * are licensed under the Apache Public License (version 2) and
   * are Copyright (c) 2009-2012 by Appcelerator, Inc.
   */
  
  /*
   * 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.
   */
  
  #ifndef ThreadIdentifierDataPthreads_h
  #define ThreadIdentifierDataPthreads_h
  
  #include <wtf/Threading.h>
  
  namespace WTI {
  
  // 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 {
      WTF_MAKE_NONCOPYABLE(ThreadIdentifierData);
  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 WTI
  
  #endif // ThreadIdentifierDataPthreads_h
  
  
  