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