1/* 2 * Copyright (C) 2009 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 WorkerRunLoop_h 32#define WorkerRunLoop_h 33 34#include "ScriptExecutionContext.h" 35#include <memory> 36#include <wtf/MessageQueue.h> 37 38namespace WebCore { 39 40 class ModePredicate; 41 class WorkerGlobalScope; 42 class WorkerSharedTimer; 43 44 class WorkerRunLoop { 45 public: 46 WorkerRunLoop(); 47 ~WorkerRunLoop(); 48 49 // Blocking call. Waits for tasks and timers, invokes the callbacks. 50 void run(WorkerGlobalScope*); 51 52 enum WaitMode { WaitForMessage, DontWaitForMessage }; 53 54 // Waits for a single task and returns. 55 MessageQueueWaitResult runInMode(WorkerGlobalScope*, const String& mode, WaitMode = WaitForMessage); 56 57 void terminate(); 58 bool terminated() const { return m_messageQueue.killed(); } 59 60 void postTask(ScriptExecutionContext::Task); 61 void postTaskAndTerminate(ScriptExecutionContext::Task); 62 void postTaskForMode(ScriptExecutionContext::Task, const String& mode); 63 64 unsigned long createUniqueId() { return ++m_uniqueId; } 65 66 static String defaultMode(); 67 68 class Task { 69 WTF_MAKE_NONCOPYABLE(Task); WTF_MAKE_FAST_ALLOCATED; 70 public: 71 static std::unique_ptr<Task> create(ScriptExecutionContext::Task, const String& mode); 72 ~Task() { } 73 const String& mode() const { return m_mode; } 74 void performTask(const WorkerRunLoop&, WorkerGlobalScope*); 75 76 private: 77 Task(ScriptExecutionContext::Task, const String& mode); 78 79 ScriptExecutionContext::Task m_task; 80 String m_mode; 81 }; 82 83 private: 84 friend class RunLoopSetup; 85 MessageQueueWaitResult runInMode(WorkerGlobalScope*, const ModePredicate&, WaitMode); 86 87 // Runs any clean up tasks that are currently in the queue and returns. 88 // This should only be called when the context is closed or loop has been terminated. 89 void runCleanupTasks(WorkerGlobalScope*); 90 91 MessageQueue<Task> m_messageQueue; 92 std::unique_ptr<WorkerSharedTimer> m_sharedTimer; 93 int m_nestedCount; 94 unsigned long m_uniqueId; 95 }; 96 97} // namespace WebCore 98 99#endif // WorkerRunLoop_h 100