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