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      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 #if ENABLE(WORKERS)
     35 
     36 #include "ScriptExecutionContext.h"
     37 #include <wtf/MessageQueue.h>
     38 #include <wtf/OwnPtr.h>
     39 #include <wtf/PassOwnPtr.h>
     40 
     41 namespace WebCore {
     42 
     43     class ModePredicate;
     44     class WorkerContext;
     45     class WorkerSharedTimer;
     46 
     47     class WorkerRunLoop {
     48     public:
     49         WorkerRunLoop();
     50         ~WorkerRunLoop();
     51 
     52         // Blocking call. Waits for tasks and timers, invokes the callbacks.
     53         void run(WorkerContext*);
     54 
     55         // Waits for a single task and returns.
     56         MessageQueueWaitResult runInMode(WorkerContext*, const String& mode);
     57 
     58         void terminate();
     59         bool terminated() { return m_messageQueue.killed(); }
     60 
     61         void postTask(PassOwnPtr<ScriptExecutionContext::Task>);
     62         void postTaskForMode(PassOwnPtr<ScriptExecutionContext::Task>, const String& mode);
     63 
     64         unsigned long createUniqueId() { return ++m_uniqueId; }
     65 
     66         static String defaultMode();
     67 
     68         class Task {
     69             WTF_MAKE_NONCOPYABLE(Task); WTF_MAKE_FAST_ALLOCATED;
     70         public:
     71             static PassOwnPtr<Task> create(PassOwnPtr<ScriptExecutionContext::Task> task, const String& mode);
     72             ~Task() { }
     73             const String& mode() const { return m_mode; }
     74             void performTask(ScriptExecutionContext* context);
     75 
     76         private:
     77             Task(PassOwnPtr<ScriptExecutionContext::Task> task, const String& mode);
     78 
     79             OwnPtr<ScriptExecutionContext::Task> m_task;
     80             String m_mode;
     81         };
     82 
     83     private:
     84         friend class RunLoopSetup;
     85         MessageQueueWaitResult runInMode(WorkerContext*, const ModePredicate&);
     86 
     87         MessageQueue<Task> m_messageQueue;
     88         OwnPtr<WorkerSharedTimer> m_sharedTimer;
     89         int m_nestedCount;
     90         unsigned long m_uniqueId;
     91     };
     92 
     93 } // namespace WebCore
     94 
     95 #endif // ENABLE(WORKERS)
     96 
     97 #endif // WorkerRunLoop_h
     98