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();
terminated()59         bool terminated() { return m_messageQueue.killed(); }
60 
61         void postTask(PassOwnPtr<ScriptExecutionContext::Task>);
62         void postTaskForMode(PassOwnPtr<ScriptExecutionContext::Task>, const String& mode);
63 
createUniqueId()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);
~Task()72             ~Task() { }
mode()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