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      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 #ifndef FileThread_h
     32 #define FileThread_h
     33 
     34 #if ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
     35 
     36 #include <wtf/MessageQueue.h>
     37 #include <wtf/PassOwnPtr.h>
     38 #include <wtf/PassRefPtr.h>
     39 #include <wtf/Threading.h>
     40 
     41 namespace WebCore {
     42 
     43 class FileStream;
     44 
     45 class FileThread : public ThreadSafeRefCounted<FileThread> {
     46 public:
     47     static PassRefPtr<FileThread> create()
     48     {
     49         return adoptRef(new FileThread());
     50     }
     51 
     52     ~FileThread();
     53 
     54     bool start();
     55     void stop();
     56 
     57     class Task {
     58         WTF_MAKE_NONCOPYABLE(Task);
     59     public:
     60         virtual ~Task() { }
     61         virtual void performTask() = 0;
     62         void* instance() const { return m_instance; }
     63     protected:
     64         Task(void* instance) : m_instance(instance) { }
     65         void* m_instance;
     66     };
     67 
     68     void postTask(PassOwnPtr<Task> task);
     69 
     70     void unscheduleTasks(const void* instance);
     71 
     72 private:
     73     FileThread();
     74 
     75     static void* fileThreadStart(void*);
     76     void* runLoop();
     77 
     78     ThreadIdentifier m_threadID;
     79     RefPtr<FileThread> m_selfRef;
     80     MessageQueue<Task> m_queue;
     81 
     82     Mutex m_threadCreationMutex;
     83 };
     84 
     85 } // namespace WebCore
     86 
     87 #endif // ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
     88 
     89 #endif // FileThread_h
     90