1 /* 2 * Copyright (C) 2013 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 * * Neither the name of Google Inc. nor the names of its 11 * contributors may be used to endorse or promote products derived from 12 * this software without specific prior written permission. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef MainThreadTaskRunner_h 28 #define MainThreadTaskRunner_h 29 30 #include "platform/Timer.h" 31 32 #include "wtf/FastAllocBase.h" 33 #include "wtf/Noncopyable.h" 34 #include "wtf/OwnPtr.h" 35 #include "wtf/PassOwnPtr.h" 36 #include "wtf/Vector.h" 37 #include "wtf/WeakPtr.h" 38 39 namespace WebCore { 40 41 class ExecutionContext; 42 class ExecutionContextTask; 43 44 class MainThreadTaskRunner { 45 WTF_MAKE_NONCOPYABLE(MainThreadTaskRunner); 46 WTF_MAKE_FAST_ALLOCATED; 47 48 public: 49 static PassOwnPtr<MainThreadTaskRunner> create(ExecutionContext*); 50 51 ~MainThreadTaskRunner(); 52 53 void postTask(PassOwnPtr<ExecutionContextTask>); // Executes the task on context's thread asynchronously. 54 void perform(PassOwnPtr<ExecutionContextTask>); 55 void suspend(); 56 void resume(); 57 58 private: 59 explicit MainThreadTaskRunner(ExecutionContext*); 60 61 void pendingTasksTimerFired(Timer<MainThreadTaskRunner>*); 62 63 ExecutionContext* m_context; 64 WeakPtrFactory<MainThreadTaskRunner> m_weakFactory; 65 Timer<MainThreadTaskRunner> m_pendingTasksTimer; 66 Vector<OwnPtr<ExecutionContextTask> > m_pendingTasks; 67 bool m_suspended; 68 }; 69 70 inline PassOwnPtr<MainThreadTaskRunner> MainThreadTaskRunner::create(ExecutionContext* context) 71 { 72 return adoptPtr(new MainThreadTaskRunner(context)); 73 } 74 75 } // namespace 76 77 #endif 78
