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#ifndef FileThread_h 32#define FileThread_h 33 34#include <functional> 35#include <wtf/MessageQueue.h> 36#include <wtf/PassRefPtr.h> 37#include <wtf/Threading.h> 38 39namespace WebCore { 40 41class FileStream; 42 43class FileThread : public ThreadSafeRefCounted<FileThread> { 44public: 45 static PassRefPtr<FileThread> create() 46 { 47 return adoptRef(new FileThread()); 48 } 49 50 ~FileThread(); 51 52 bool start(); 53 void stop(); 54 55 class Task { 56 WTF_MAKE_NONCOPYABLE(Task); 57 public: 58 template<typename T, typename U, typename = typename std::enable_if<!std::is_base_of<Task, U>::value && std::is_convertible<U, std::function<void ()>>::value>::type> 59 Task(T* instance, U method) 60 : m_task(WTF::move(method)) 61 , m_instance(instance) 62 { 63 } 64 65 Task(Task&& other) 66 : m_task(WTF::move(other.m_task)) 67 , m_instance(other.m_instance) 68 { 69 } 70 71 void performTask() 72 { 73 m_task(); 74 } 75 void* instance() const { return m_instance; } 76 77 private: 78 std::function<void ()> m_task; 79 void* m_instance; 80 }; 81 82 void postTask(Task); 83 84 void unscheduleTasks(const void* instance); 85 86private: 87 FileThread(); 88 89 static void fileThreadStart(void*); 90 void runLoop(); 91 92 ThreadIdentifier m_threadID; 93 RefPtr<FileThread> m_selfRef; 94 MessageQueue<Task> m_queue; 95 96 Mutex m_threadCreationMutex; 97}; 98 99} // namespace WebCore 100 101#endif // FileThread_h 102