1/* 2 * Copyright (C) 2010 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 ENABLE(BLOB) || ENABLE(FILE_SYSTEM) 34 35#include "FileThread.h" 36 37#include "AutodrainedPool.h" 38#include "Logging.h" 39 40namespace WebCore { 41 42FileThread::FileThread() 43 : m_threadID(0) 44{ 45 m_selfRef = this; 46} 47 48FileThread::~FileThread() 49{ 50 ASSERT(m_queue.killed()); 51} 52 53bool FileThread::start() 54{ 55 MutexLocker lock(m_threadCreationMutex); 56 if (m_threadID) 57 return true; 58 m_threadID = createThread(FileThread::fileThreadStart, this, "WebCore: File"); 59 return m_threadID; 60} 61 62void FileThread::stop() 63{ 64 m_queue.kill(); 65} 66 67void FileThread::postTask(PassOwnPtr<Task> task) 68{ 69 m_queue.append(task); 70} 71 72class SameInstancePredicate { 73public: 74 SameInstancePredicate(const void* instance) : m_instance(instance) { } 75 bool operator()(FileThread::Task* task) const { return task->instance() == m_instance; } 76private: 77 const void* m_instance; 78}; 79 80void FileThread::unscheduleTasks(const void* instance) 81{ 82 SameInstancePredicate predicate(instance); 83 m_queue.removeIf(predicate); 84} 85 86void* FileThread::fileThreadStart(void* arg) 87{ 88 FileThread* fileThread = static_cast<FileThread*>(arg); 89 return fileThread->runLoop(); 90} 91 92void* FileThread::runLoop() 93{ 94 { 95 // Wait for FileThread::start() to complete to have m_threadID 96 // established before starting the main loop. 97 MutexLocker lock(m_threadCreationMutex); 98 LOG(FileAPI, "Started FileThread %p", this); 99 } 100 101 AutodrainedPool pool; 102 while (OwnPtr<Task> task = m_queue.waitForMessage()) { 103 task->performTask(); 104 pool.cycle(); 105 } 106 107 LOG(FileAPI, "About to detach thread %i and clear the ref to FileThread %p, which currently has %i ref(s)", m_threadID, this, refCount()); 108 109 detachThread(m_threadID); 110 111 // Clear the self refptr, possibly resulting in deletion 112 m_selfRef = 0; 113 114 return 0; 115} 116 117} // namespace WebCore 118 119#endif // ENABLE(BLOB) || ENABLE(FILE_SYSTEM) 120