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/ScriptExecutionContext.h" 35 #include <wtf/MessageQueue.h> 36 #include <wtf/OwnPtr.h> 37 #include <wtf/PassOwnPtr.h> 38 39 namespace WebCore { 40 41 class ModePredicate; 42 class WorkerGlobalScope; 43 class WorkerSharedTimer; 44 45 class WorkerRunLoop { 46 public: 47 WorkerRunLoop(); 48 ~WorkerRunLoop(); 49 50 // Blocking call. Waits for tasks and timers, invokes the callbacks. 51 void run(WorkerGlobalScope*); 52 53 enum WaitMode { WaitForMessage, DontWaitForMessage }; 54 55 // Waits for a single task and returns. 56 MessageQueueWaitResult runInMode(WorkerGlobalScope*, const String& mode, WaitMode = WaitForMessage); 57 58 void terminate(); 59 bool terminated() const { return m_messageQueue.killed(); } 60 61 // Returns true if the loop is still alive, false if it has been terminated. 62 bool postTask(PassOwnPtr<ScriptExecutionContext::Task>); 63 void postTaskAndTerminate(PassOwnPtr<ScriptExecutionContext::Task>); 64 // Returns true if the loop is still alive, false if it has been terminated. 65 bool postTaskForMode(PassOwnPtr<ScriptExecutionContext::Task>, const String& mode); 66 67 unsigned long createUniqueId() { return ++m_uniqueId; } 68 69 static String defaultMode(); 70 71 class Task { 72 WTF_MAKE_NONCOPYABLE(Task); WTF_MAKE_FAST_ALLOCATED; 73 public: 74 static PassOwnPtr<Task> create(PassOwnPtr<ScriptExecutionContext::Task> task, const String& mode); 75 ~Task() { } 76 const String& mode() const { return m_mode; } 77 void performTask(const WorkerRunLoop&, ScriptExecutionContext*); 78 79 private: 80 Task(PassOwnPtr<ScriptExecutionContext::Task> task, const String& mode); 81 82 OwnPtr<ScriptExecutionContext::Task> m_task; 83 String m_mode; 84 }; 85 86 private: 87 friend class RunLoopSetup; 88 MessageQueueWaitResult runInMode(WorkerGlobalScope*, const ModePredicate&, WaitMode); 89 90 // Runs any clean up tasks that are currently in the queue and returns. 91 // This should only be called when the context is closed or loop has been terminated. 92 void runCleanupTasks(WorkerGlobalScope*); 93 94 MessageQueue<Task> m_messageQueue; 95 OwnPtr<WorkerSharedTimer> m_sharedTimer; 96 int m_nestedCount; 97 unsigned long m_uniqueId; 98 }; 99 100 } // namespace WebCore 101 102 #endif // WorkerRunLoop_h 103
