| /* |
| * Copyright (C) 2013 Google Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include "core/dom/MainThreadTaskRunner.h" |
| |
| #include "core/dom/ExecutionContext.h" |
| #include "core/dom/ExecutionContextTask.h" |
| #include "core/inspector/InspectorInstrumentation.h" |
| #include "platform/CrossThreadFunctional.h" |
| #include "public/platform/Platform.h" |
| #include "wtf/Assertions.h" |
| |
| namespace blink { |
| |
| MainThreadTaskRunner::MainThreadTaskRunner(ExecutionContext* context) |
| : m_context(context), |
| m_pendingTasksTimer(this, &MainThreadTaskRunner::pendingTasksTimerFired), |
| m_suspended(false), |
| m_weakFactory(this), |
| // Bind a WeakPtr now to avoid data races creating a WeakPtr inside |
| // postTask. |
| m_weakPtr(m_weakFactory.createWeakPtr()) {} |
| |
| MainThreadTaskRunner::~MainThreadTaskRunner() {} |
| |
| void MainThreadTaskRunner::postTaskInternal( |
| const WebTraceLocation& location, |
| std::unique_ptr<ExecutionContextTask> task, |
| bool isInspectorTask, |
| bool instrumenting) { |
| Platform::current()->mainThread()->getWebTaskRunner()->postTask( |
| location, |
| crossThreadBind(&MainThreadTaskRunner::perform, m_weakPtr, |
| passed(std::move(task)), isInspectorTask, instrumenting)); |
| } |
| |
| void MainThreadTaskRunner::postTask(const WebTraceLocation& location, |
| std::unique_ptr<ExecutionContextTask> task, |
| const String& taskNameForInstrumentation) { |
| if (!taskNameForInstrumentation.isEmpty()) |
| InspectorInstrumentation::asyncTaskScheduled( |
| m_context, taskNameForInstrumentation, task.get()); |
| const bool instrumenting = !taskNameForInstrumentation.isEmpty(); |
| postTaskInternal(location, std::move(task), false, instrumenting); |
| } |
| |
| void MainThreadTaskRunner::postInspectorTask( |
| const WebTraceLocation& location, |
| std::unique_ptr<ExecutionContextTask> task) { |
| postTaskInternal(location, std::move(task), true, false); |
| } |
| |
| void MainThreadTaskRunner::perform(std::unique_ptr<ExecutionContextTask> task, |
| bool isInspectorTask, |
| bool instrumenting) { |
| // If the owner m_context is about to be swept then it |
| // is no longer safe to access. |
| if (ThreadHeap::willObjectBeLazilySwept(m_context.get())) |
| return; |
| |
| if (!isInspectorTask && |
| (m_context->tasksNeedSuspension() || !m_pendingTasks.isEmpty())) { |
| m_pendingTasks.append(make_pair(std::move(task), instrumenting)); |
| return; |
| } |
| |
| InspectorInstrumentation::AsyncTask asyncTask(m_context, task.get(), |
| !isInspectorTask); |
| task->performTask(m_context); |
| } |
| |
| void MainThreadTaskRunner::suspend() { |
| DCHECK(!m_suspended); |
| m_pendingTasksTimer.stop(); |
| m_suspended = true; |
| } |
| |
| void MainThreadTaskRunner::resume() { |
| DCHECK(m_suspended); |
| if (!m_pendingTasks.isEmpty()) |
| m_pendingTasksTimer.startOneShot(0, BLINK_FROM_HERE); |
| |
| m_suspended = false; |
| } |
| |
| void MainThreadTaskRunner::pendingTasksTimerFired(TimerBase*) { |
| // If the owner m_context is about to be swept then it |
| // is no longer safe to access. |
| if (ThreadHeap::willObjectBeLazilySwept(m_context.get())) |
| return; |
| |
| while (!m_pendingTasks.isEmpty()) { |
| std::unique_ptr<ExecutionContextTask> task = |
| std::move(m_pendingTasks[0].first); |
| const bool instrumenting = m_pendingTasks[0].second; |
| m_pendingTasks.remove(0); |
| InspectorInstrumentation::AsyncTask asyncTask(m_context, task.get(), |
| instrumenting); |
| task->performTask(m_context); |
| } |
| } |
| |
| } // namespace blink |