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 "ThreadIdentifierDataPthreads.h" 36 37#include "Threading.h" 38 39#if OS(HURD) 40// PTHREAD_KEYS_MAX is not defined in bionic nor in Hurd, so explicitly define it here. 41#define PTHREAD_KEYS_MAX 1024 42#else 43#include <limits.h> 44#endif 45 46namespace WTF { 47 48pthread_key_t ThreadIdentifierData::m_key = PTHREAD_KEYS_MAX; 49 50void threadDidExit(ThreadIdentifier); 51 52ThreadIdentifierData::~ThreadIdentifierData() 53{ 54 threadDidExit(m_identifier); 55} 56 57void ThreadIdentifierData::initializeOnce() 58{ 59 if (pthread_key_create(&m_key, destruct)) 60 CRASH(); 61} 62 63ThreadIdentifier ThreadIdentifierData::identifier() 64{ 65 ASSERT(m_key != PTHREAD_KEYS_MAX); 66 ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(pthread_getspecific(m_key)); 67 68 return threadIdentifierData ? threadIdentifierData->m_identifier : 0; 69} 70 71void ThreadIdentifierData::initialize(ThreadIdentifier id) 72{ 73 ASSERT(!identifier()); 74 pthread_setspecific(m_key, new ThreadIdentifierData(id)); 75} 76 77void ThreadIdentifierData::destruct(void* data) 78{ 79 ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(data); 80 ASSERT(threadIdentifierData); 81 82 if (threadIdentifierData->m_isDestroyedOnce) { 83 delete threadIdentifierData; 84 return; 85 } 86 87 threadIdentifierData->m_isDestroyedOnce = true; 88 // Re-setting the value for key causes another destruct() call after all other thread-specific destructors were called. 89 pthread_setspecific(m_key, threadIdentifierData); 90} 91 92} // namespace WTF 93 94#endif // USE(PTHREADS) 95