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 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 */ 26 27 #include "config.h" 28 #include "core/dom/MainThreadTaskRunner.h" 29 30 #include "core/dom/ExecutionContext.h" 31 #include "core/dom/ExecutionContextTask.h" 32 #include "core/inspector/InspectorInstrumentation.h" 33 #include "wtf/Assertions.h" 34 #include "wtf/MainThread.h" 35 36 namespace blink { 37 38 struct PerformTaskContext { 39 WTF_MAKE_NONCOPYABLE(PerformTaskContext); WTF_MAKE_FAST_ALLOCATED; 40 public: 41 PerformTaskContext(WeakPtr<MainThreadTaskRunner> runner, PassOwnPtr<ExecutionContextTask> task, bool isInspectorTask) 42 : m_runner(runner) 43 , m_task(task) 44 , m_isInspectorTask(isInspectorTask) 45 { 46 } 47 48 WeakPtr<MainThreadTaskRunner> m_runner; 49 OwnPtr<ExecutionContextTask> m_task; 50 bool m_isInspectorTask; 51 52 static void didReceiveTask(void* untypedContext); 53 }; 54 55 void PerformTaskContext::didReceiveTask(void* untypedContext) 56 { 57 ASSERT(isMainThread()); 58 59 OwnPtr<PerformTaskContext> self = adoptPtr(static_cast<PerformTaskContext*>(untypedContext)); 60 ASSERT(self); 61 62 MainThreadTaskRunner* runner = self->m_runner.get(); 63 if (!runner) 64 return; 65 runner->perform(self->m_task.release(), self->m_isInspectorTask); 66 } 67 68 MainThreadTaskRunner::MainThreadTaskRunner(ExecutionContext* context) 69 : m_context(context) 70 , m_weakFactory(this) 71 , m_pendingTasksTimer(this, &MainThreadTaskRunner::pendingTasksTimerFired) 72 , m_suspended(false) 73 { 74 } 75 76 MainThreadTaskRunner::~MainThreadTaskRunner() 77 { 78 } 79 80 void MainThreadTaskRunner::postTask(PassOwnPtr<ExecutionContextTask> task) 81 { 82 if (!task->taskNameForInstrumentation().isEmpty()) 83 InspectorInstrumentation::didPostExecutionContextTask(m_context, task.get()); 84 callOnMainThread(PerformTaskContext::didReceiveTask, new PerformTaskContext(m_weakFactory.createWeakPtr(), task, false)); 85 } 86 87 void MainThreadTaskRunner::postInspectorTask(PassOwnPtr<ExecutionContextTask> task) 88 { 89 callOnMainThread(PerformTaskContext::didReceiveTask, new PerformTaskContext(m_weakFactory.createWeakPtr(), task, true)); 90 } 91 92 void MainThreadTaskRunner::perform(PassOwnPtr<ExecutionContextTask> task, bool isInspectorTask) 93 { 94 if (!isInspectorTask && (m_context->tasksNeedSuspension() || !m_pendingTasks.isEmpty())) { 95 m_pendingTasks.append(task); 96 return; 97 } 98 99 const bool instrumenting = !isInspectorTask && !task->taskNameForInstrumentation().isEmpty(); 100 if (instrumenting) 101 InspectorInstrumentation::willPerformExecutionContextTask(m_context, task.get()); 102 task->performTask(m_context); 103 if (instrumenting) 104 InspectorInstrumentation::didPerformExecutionContextTask(m_context); 105 } 106 107 void MainThreadTaskRunner::suspend() 108 { 109 ASSERT(!m_suspended); 110 m_pendingTasksTimer.stop(); 111 m_suspended = true; 112 } 113 114 void MainThreadTaskRunner::resume() 115 { 116 ASSERT(m_suspended); 117 if (!m_pendingTasks.isEmpty()) 118 m_pendingTasksTimer.startOneShot(0, FROM_HERE); 119 120 m_suspended = false; 121 } 122 123 void MainThreadTaskRunner::pendingTasksTimerFired(Timer<MainThreadTaskRunner>*) 124 { 125 while (!m_pendingTasks.isEmpty()) { 126 OwnPtr<ExecutionContextTask> task = m_pendingTasks[0].release(); 127 m_pendingTasks.remove(0); 128 const bool instrumenting = !task->taskNameForInstrumentation().isEmpty(); 129 if (instrumenting) 130 InspectorInstrumentation::willPerformExecutionContextTask(m_context, task.get()); 131 task->performTask(m_context); 132 if (instrumenting) 133 InspectorInstrumentation::didPerformExecutionContextTask(m_context); 134 } 135 } 136 137 } // namespace 138