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
41namespace 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