JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / wtf / ThreadIdentifierDataPthreads.h

diff --git a/wtf/ThreadIdentifierDataPthreads.h b/wtf/ThreadIdentifierDataPthreads.h
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-/*
- * 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 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 {
-    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 WTF
-
-#endif // ThreadIdentifierDataPthreads_h
-
-