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#include "config.h"
32
33#if ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
34
35#include "FileThread.h"
36
37#include "AutodrainedPool.h"
38#include "Logging.h"
39
40namespace WebCore {
41
42FileThread::FileThread()
43    : m_threadID(0)
44{
45    m_selfRef = this;
46}
47
48FileThread::~FileThread()
49{
50    ASSERT(m_queue.killed());
51}
52
53bool FileThread::start()
54{
55    MutexLocker lock(m_threadCreationMutex);
56    if (m_threadID)
57        return true;
58    m_threadID = createThread(FileThread::fileThreadStart, this, "WebCore: File");
59    return m_threadID;
60}
61
62void FileThread::stop()
63{
64    m_queue.kill();
65}
66
67void FileThread::postTask(PassOwnPtr<Task> task)
68{
69    m_queue.append(task);
70}
71
72class SameInstancePredicate {
73public:
74    SameInstancePredicate(const void* instance) : m_instance(instance) { }
75    bool operator()(FileThread::Task* task) const { return task->instance() == m_instance; }
76private:
77    const void* m_instance;
78};
79
80void FileThread::unscheduleTasks(const void* instance)
81{
82    SameInstancePredicate predicate(instance);
83    m_queue.removeIf(predicate);
84}
85
86void* FileThread::fileThreadStart(void* arg)
87{
88    FileThread* fileThread = static_cast<FileThread*>(arg);
89    return fileThread->runLoop();
90}
91
92void* FileThread::runLoop()
93{
94    {
95        // Wait for FileThread::start() to complete to have m_threadID
96        // established before starting the main loop.
97        MutexLocker lock(m_threadCreationMutex);
98        LOG(FileAPI, "Started FileThread %p", this);
99    }
100
101    AutodrainedPool pool;
102    while (OwnPtr<Task> task = m_queue.waitForMessage()) {
103        task->performTask();
104        pool.cycle();
105    }
106
107    LOG(FileAPI, "About to detach thread %i and clear the ref to FileThread %p, which currently has %i ref(s)", m_threadID, this, refCount());
108
109    detachThread(m_threadID);
110
111    // Clear the self refptr, possibly resulting in deletion
112    m_selfRef = 0;
113
114    return 0;
115}
116
117} // namespace WebCore
118
119#endif // ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
120