1/*
2 * Copyright (C) 2008 Apple 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. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "StorageThread.h"
28
29#include "StorageAreaSync.h"
30#include <wtf/AutodrainedPool.h>
31#include <wtf/HashSet.h>
32#include <wtf/MainThread.h>
33
34namespace WebCore {
35
36static HashSet<StorageThread*>& activeStorageThreads()
37{
38    ASSERT(isMainThread());
39    DEFINE_STATIC_LOCAL(HashSet<StorageThread*>, threads, ());
40    return threads;
41}
42
43PassOwnPtr<StorageThread> StorageThread::create()
44{
45    return adoptPtr(new StorageThread);
46}
47
48StorageThread::StorageThread()
49    : m_threadID(0)
50{
51    ASSERT(isMainThread());
52}
53
54StorageThread::~StorageThread()
55{
56    ASSERT(isMainThread());
57    ASSERT(!m_threadID);
58}
59
60bool StorageThread::start()
61{
62    ASSERT(isMainThread());
63    if (!m_threadID)
64        m_threadID = createThread(StorageThread::threadEntryPointCallback, this, "WebCore: LocalStorage");
65    activeStorageThreads().add(this);
66    return m_threadID;
67}
68
69void StorageThread::threadEntryPointCallback(void* thread)
70{
71    static_cast<StorageThread*>(thread)->threadEntryPoint();
72}
73
74void StorageThread::threadEntryPoint()
75{
76    ASSERT(!isMainThread());
77
78    while (OwnPtr<Function<void ()> > function = m_queue.waitForMessage()) {
79        AutodrainedPool pool;
80        (*function)();
81    }
82}
83
84void StorageThread::dispatch(const Function<void ()>& function)
85{
86    ASSERT(isMainThread());
87    ASSERT(!m_queue.killed() && m_threadID);
88    m_queue.append(adoptPtr(new Function<void ()>(function)));
89}
90
91void StorageThread::terminate()
92{
93    ASSERT(isMainThread());
94    ASSERT(!m_queue.killed() && m_threadID);
95    activeStorageThreads().remove(this);
96    // Even in weird, exceptional cases, don't wait on a nonexistent thread to terminate.
97    if (!m_threadID)
98        return;
99
100    m_queue.append(adoptPtr(new Function<void ()>((bind(&StorageThread::performTerminate, this)))));
101    waitForThreadCompletion(m_threadID);
102    ASSERT(m_queue.killed());
103    m_threadID = 0;
104}
105
106void StorageThread::performTerminate()
107{
108    ASSERT(!isMainThread());
109    m_queue.kill();
110}
111
112void StorageThread::releaseFastMallocFreeMemoryInAllThreads()
113{
114    HashSet<StorageThread*>& threads = activeStorageThreads();
115
116    for (HashSet<StorageThread*>::iterator it = threads.begin(), end = threads.end(); it != end; ++it)
117        (*it)->dispatch(bind(WTF::releaseFastMallocFreeMemory));
118}
119
120}
121