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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/Threading.h"
     39 
     40 #if OS(ANDROID) || OS(HURD)
     41 // PTHREAD_KEYS_MAX is not defined in bionic nor in Hurd, so explicitly define it here.
     42 #define PTHREAD_KEYS_MAX 1024
     43 #else
     44 #include <limits.h>
     45 #endif
     46 
     47 namespace WTF {
     48 
     49 pthread_key_t ThreadIdentifierData::m_key = PTHREAD_KEYS_MAX;
     50 
     51 void threadDidExit(ThreadIdentifier);
     52 
     53 ThreadIdentifierData::~ThreadIdentifierData()
     54 {
     55     threadDidExit(m_identifier);
     56 }
     57 
     58 void ThreadIdentifierData::initializeOnce()
     59 {
     60     if (pthread_key_create(&m_key, destruct))
     61         CRASH();
     62 }
     63 
     64 ThreadIdentifier ThreadIdentifierData::identifier()
     65 {
     66     ASSERT(m_key != PTHREAD_KEYS_MAX);
     67     ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(pthread_getspecific(m_key));
     68 
     69     return threadIdentifierData ? threadIdentifierData->m_identifier : 0;
     70 }
     71 
     72 void ThreadIdentifierData::initialize(ThreadIdentifier id)
     73 {
     74     ASSERT(!identifier());
     75     pthread_setspecific(m_key, new ThreadIdentifierData(id));
     76 }
     77 
     78 void ThreadIdentifierData::destruct(void* data)
     79 {
     80     ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(data);
     81     ASSERT(threadIdentifierData);
     82 
     83     if (threadIdentifierData->m_isDestroyedOnce) {
     84         delete threadIdentifierData;
     85         return;
     86     }
     87 
     88     threadIdentifierData->m_isDestroyedOnce = true;
     89     // Re-setting the value for key causes another destruct() call after all other thread-specific destructors were called.
     90     pthread_setspecific(m_key, threadIdentifierData);
     91 }
     92 
     93 } // namespace WTF
     94 
     95 #endif // USE(PTHREADS)
     96