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
40 namespace WebCore {
41
FileThread()42 FileThread::FileThread()
43 : m_threadID(0)
44 {
45 m_selfRef = this;
46 }
47
~FileThread()48 FileThread::~FileThread()
49 {
50 ASSERT(m_queue.killed());
51 }
52
start()53 bool 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
stop()62 void FileThread::stop()
63 {
64 m_queue.kill();
65 }
66
postTask(PassOwnPtr<Task> task)67 void FileThread::postTask(PassOwnPtr<Task> task)
68 {
69 m_queue.append(task);
70 }
71
72 class SameInstancePredicate {
73 public:
SameInstancePredicate(const void * instance)74 SameInstancePredicate(const void* instance) : m_instance(instance) { }
operator ()(FileThread::Task * task) const75 bool operator()(FileThread::Task* task) const { return task->instance() == m_instance; }
76 private:
77 const void* m_instance;
78 };
79
unscheduleTasks(const void * instance)80 void FileThread::unscheduleTasks(const void* instance)
81 {
82 SameInstancePredicate predicate(instance);
83 m_queue.removeIf(predicate);
84 }
85
fileThreadStart(void * arg)86 void* FileThread::fileThreadStart(void* arg)
87 {
88 FileThread* fileThread = static_cast<FileThread*>(arg);
89 return fileThread->runLoop();
90 }
91
runLoop()92 void* 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