1 files changed, 119 insertions, 0 deletions
diff --git a/WebCore/html/FileThread.cpp b/WebCore/html/FileThread.cpp
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+++ b/WebCore/html/FileThread.cpp
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+/*
+ * Copyright (C) 2010 Google Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#if ENABLE(FILE_WRITER) || ENABLE(FILE_READER)
+
+#include "FileThread.h"
+
+#include "AutodrainedPool.h"
+#include "Logging.h"
+
+namespace WebCore {
+
+FileThread::FileThread()
+    : m_threadID(0)
+{
+    m_selfRef = this;
+}
+
+FileThread::~FileThread()
+{
+    ASSERT(m_queue.killed());
+}
+
+bool FileThread::start()
+{
+    MutexLocker lock(m_threadCreationMutex);
+    if (m_threadID)
+        return true;
+    m_threadID = createThread(FileThread::fileThreadStart, this, "WebCore: File");
+    return m_threadID;
+}
+
+void FileThread::stop()
+{
+    return m_queue.kill();
+}
+
+void FileThread::postTask(PassOwnPtr<Task> task)
+{
+    m_queue.append(task);
+}
+
+class SameFilePredicate {
+public:
+    SameFilePredicate(const FileStream* stream) : m_stream(stream) { }
+    bool operator()(FileThread::Task* task) const { return task->stream() == m_stream; }
+private:
+    const FileStream* m_stream;
+};
+
+void FileThread::unscheduleTasks(const FileStream* stream)
+{
+    SameFilePredicate predicate(stream);
+    m_queue.removeIf(predicate);
+}
+
+void* FileThread::fileThreadStart(void* arg)
+{
+    FileThread* fileThread = static_cast<FileThread*>(arg);
+    return fileThread->runLoop();
+}
+
+void* FileThread::runLoop()
+{
+    {
+        // Wait for FileThread::start() to complete to have m_threadID
+        // established before starting the main loop.
+        MutexLocker lock(m_threadCreationMutex);
+        LOG(FileAPI, "Started FileThread %p", this);
+    }
+
+    AutodrainedPool pool;
+    while (OwnPtr<Task> task = m_queue.waitForMessage()) {
+        task->performTask();
+        pool.cycle();
+    }
+
+    LOG(FileAPI, "About to detach thread %i and clear the ref to FileThread %p, which currently has %i ref(s)", m_threadID, this, refCount());
+
+    detachThread(m_threadID);
+
+    // Clear the self refptr, possibly resulting in deletion
+    m_selfRef = 0;
+
+    return 0;
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(FILE_WRITER) || ENABLE(FILE_READER)