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      1 /*
      2  * Copyright (C) 2009, 2011 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 
     33 #if USE(PTHREADS)
     34 
     35 #include "wtf/ThreadIdentifierDataPthreads.h"
     36 
     37 #include "wtf/Assertions.h"
     38 #include "wtf/WTF.h"
     39 
     40 #if OS(ANDROID)
     41 // PTHREAD_KEYS_MAX is not defined in bionic, so explicitly define it here.
     42 #ifndef PTHREAD_KEYS_MAX
     43 #define PTHREAD_KEYS_MAX 1024
     44 #endif // PTHREAD_KEYS_MAX
     45 #else
     46 #include <limits.h>
     47 #endif
     48 
     49 namespace WTF {
     50 
     51 pthread_key_t ThreadIdentifierData::m_key = PTHREAD_KEYS_MAX;
     52 
     53 void threadDidExit(ThreadIdentifier);
     54 
     55 ThreadIdentifierData::~ThreadIdentifierData()
     56 {
     57     threadDidExit(m_identifier);
     58 }
     59 
     60 void ThreadIdentifierData::initializeOnce()
     61 {
     62     if (pthread_key_create(&m_key, destruct))
     63         CRASH();
     64 }
     65 
     66 ThreadIdentifier ThreadIdentifierData::identifier()
     67 {
     68     ASSERT(m_key != PTHREAD_KEYS_MAX);
     69     ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(pthread_getspecific(m_key));
     70 
     71     return threadIdentifierData ? threadIdentifierData->m_identifier : 0;
     72 }
     73 
     74 void ThreadIdentifierData::initialize(ThreadIdentifier id)
     75 {
     76     ASSERT(!identifier());
     77     pthread_setspecific(m_key, new ThreadIdentifierData(id));
     78 }
     79 
     80 void ThreadIdentifierData::destruct(void* data)
     81 {
     82     if (isShutdown())
     83         return;
     84 
     85     ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(data);
     86     ASSERT(threadIdentifierData);
     87 
     88     if (threadIdentifierData->m_isDestroyedOnce) {
     89         delete threadIdentifierData;
     90         return;
     91     }
     92 
     93     threadIdentifierData->m_isDestroyedOnce = true;
     94     // Re-setting the value for key causes another destruct() call after all other thread-specific destructors were called.
     95     pthread_setspecific(m_key, threadIdentifierData);
     96 }
     97 
     98 } // namespace WTF
     99 
    100 #endif // USE(PTHREADS)
    101