code.vuplus.com Git - vuplus_webkit/blob - Source/WebCore/storage/LocalStorageThread.cpp

   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 "LocalStorageThread.h"
  28
  29 #if ENABLE(DOM_STORAGE)
  30
  31 #include "LocalStorageTask.h"
  32 #include "StorageAreaSync.h"
  33 #include <wtf/MainThread.h>
  34
  35 namespace WebCore {
  36
  37 PassOwnPtr<LocalStorageThread> LocalStorageThread::create()
  38 {
  39     return adoptPtr(new LocalStorageThread);
  40 }
  41
  42 LocalStorageThread::LocalStorageThread()
  43     : m_threadID(0)
  44 {
  45 }
  46
  47 LocalStorageThread::~LocalStorageThread()
  48 {
  49     ASSERT(isMainThread());
  50     ASSERT(!m_threadID);
  51 }
  52
  53 bool LocalStorageThread::start()
  54 {
  55     ASSERT(isMainThread());
  56     if (!m_threadID)
  57         m_threadID = createThread(LocalStorageThread::threadEntryPointCallback, this, "WebCore: LocalStorage");
  58     return m_threadID;
  59 }
  60
  61 void* LocalStorageThread::threadEntryPointCallback(void* thread)
  62 {
  63     return static_cast<LocalStorageThread*>(thread)->threadEntryPoint();
  64 }
  65
  66 void* LocalStorageThread::threadEntryPoint()
  67 {
  68     ASSERT(!isMainThread());
  69     while (OwnPtr<LocalStorageTask> task = m_queue.waitForMessage())
  70         task->performTask();
  71
  72     return 0;
  73 }
  74
  75 void LocalStorageThread::scheduleTask(PassOwnPtr<LocalStorageTask> task)
  76 {
  77     ASSERT(isMainThread());
  78     ASSERT(!m_queue.killed() && m_threadID);
  79     m_queue.append(task);
  80 }
  81
  82 void LocalStorageThread::terminate()
  83 {
  84     ASSERT(isMainThread());
  85     ASSERT(!m_queue.killed() && m_threadID);
  86     // Even in weird, exceptional cases, don't wait on a nonexistent thread to terminate.
  87     if (!m_threadID)
  88         return;
  89
  90     void* returnValue;
  91     m_queue.append(LocalStorageTask::createTerminate(this));
  92     waitForThreadCompletion(m_threadID, &returnValue);
  93     ASSERT(m_queue.killed());
  94     m_threadID = 0;
  95 }
  96
  97 void LocalStorageThread::performTerminate()
  98 {
  99     ASSERT(!isMainThread());
 100     m_queue.kill();
 101 }
 102
 103 }
 104
 105 #endif // ENABLE(DOM_STORAGE)