/* * Copyright (C) 2009 Google Inc. All rights reserved. * Copyright (C) 2017 Apple 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: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 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. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "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 THE COPYRIGHT * OWNER 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. */ #pragma once #include "ScriptExecutionContext.h" #include <memory> #include <wtf/MessageQueue.h> namespace WebCore { class ModePredicate; class WorkerGlobalScope; class WorkerSharedTimer; class WorkerRunLoop { public: WorkerRunLoop(); ~WorkerRunLoop(); // Blocking call. Waits for tasks and timers, invokes the callbacks. void run(WorkerGlobalScope*); enum WaitMode { WaitForMessage, DontWaitForMessage }; // Waits for a single task and returns. MessageQueueWaitResult runInMode(WorkerGlobalScope*, const String& mode, WaitMode = WaitForMessage); void terminate(); bool terminated() const { return m_messageQueue.killed(); } void postTask(ScriptExecutionContext::Task&&); void postTaskAndTerminate(ScriptExecutionContext::Task&&); void postTaskForMode(ScriptExecutionContext::Task&&, const String& mode); unsigned long createUniqueId() { return ++m_uniqueId; } static String defaultMode(); static String debuggerMode(); class Task { WTF_MAKE_NONCOPYABLE(Task); WTF_MAKE_FAST_ALLOCATED; public: Task(ScriptExecutionContext::Task&&, const String& mode); const String& mode() const { return m_mode; } private: void performTask(WorkerGlobalScope*); ScriptExecutionContext::Task m_task; String m_mode; friend class WorkerRunLoop; }; private: friend class RunLoopSetup; MessageQueueWaitResult runInMode(WorkerGlobalScope*, const ModePredicate&, WaitMode); // Runs any clean up tasks that are currently in the queue and returns. // This should only be called when the context is closed or loop has been terminated. void runCleanupTasks(WorkerGlobalScope*); bool isNested() const { return m_nestedCount > 1; } MessageQueue<Task> m_messageQueue; std::unique_ptr<WorkerSharedTimer> m_sharedTimer; int m_nestedCount; unsigned long m_uniqueId; }; } // namespace WebCore