1/*
2 * Copyright (C) 2011 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
6 * are met:
7 * 1.  Redistributions of source code must retain the above copyright
8 *     notice, this list of conditions and the following disclaimer.
9 * 2.  Redistributions in binary form must reproduce the above copyright
10 *     notice, this list of conditions and the following disclaimer in the
11 *     documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#ifndef CCThread_h
26#define CCThread_h
27
28#include <wtf/MessageQueue.h>
29#include <wtf/PassOwnPtr.h>
30#include <wtf/RefCounted.h>
31#include <wtf/Threading.h>
32
33namespace WebCore {
34
35// The CCThread singleton owns the compositor thread and provides
36// basic infrastructure for messaging between the two threads.
37class CCThread {
38public:
39    static PassOwnPtr<CCThread> create()
40    {
41        return adoptPtr(new CCThread());
42    }
43
44    virtual ~CCThread();
45
46    class Task {
47        WTF_MAKE_NONCOPYABLE(Task);
48    public:
49        virtual ~Task() { }
50        virtual void performTask() = 0;
51        void* instance() const { return m_instance; }
52    protected:
53        Task(void* instance) : m_instance(instance) { }
54        void* m_instance;
55    };
56
57    void postTask(PassOwnPtr<Task>); // Executes the task on context's thread asynchronously.
58
59    WTF::ThreadIdentifier threadID() const { return m_threadID; }
60
61protected:
62    explicit CCThread();
63
64    static void* compositorThreadStart(void*);
65    void* runLoop();
66
67    WTF::ThreadIdentifier m_threadID;
68    MessageQueue<Task> m_queue;
69
70    Mutex m_threadCreationMutex;
71};
72
73}
74
75#endif
76