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