1/*
2 * Copyright (C) 2010 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 FileThread_h
32#define FileThread_h
33
34#if ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
35
36#include <wtf/MessageQueue.h>
37#include <wtf/PassOwnPtr.h>
38#include <wtf/PassRefPtr.h>
39#include <wtf/Threading.h>
40
41namespace WebCore {
42
43class FileStream;
44
45class FileThread : public ThreadSafeRefCounted<FileThread> {
46public:
47    static PassRefPtr<FileThread> create()
48    {
49        return adoptRef(new FileThread());
50    }
51
52    ~FileThread();
53
54    bool start();
55    void stop();
56
57    class Task {
58        WTF_MAKE_NONCOPYABLE(Task);
59    public:
60        virtual ~Task() { }
61        virtual void performTask() = 0;
62        void* instance() const { return m_instance; }
63    protected:
64        Task(void* instance) : m_instance(instance) { }
65        void* m_instance;
66    };
67
68    void postTask(PassOwnPtr<Task> task);
69
70    void unscheduleTasks(const void* instance);
71
72private:
73    FileThread();
74
75    static void* fileThreadStart(void*);
76    void* runLoop();
77
78    ThreadIdentifier m_threadID;
79    RefPtr<FileThread> m_selfRef;
80    MessageQueue<Task> m_queue;
81
82    Mutex m_threadCreationMutex;
83};
84
85} // namespace WebCore
86
87#endif // ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
88
89#endif // FileThread_h
90