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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 #ifndef PluginMainThreadScheduler_h
     27 #define PluginMainThreadScheduler_h
     28 
     29 #include <wtf/Deque.h>
     30 #include <wtf/HashMap.h>
     31 #include <wtf/MainThread.h>
     32 #include <wtf/Threading.h>
     33 
     34 typedef struct _NPP NPP_t;
     35 typedef NPP_t* NPP;
     36 
     37 namespace WebCore {
     38 
     39 class PluginMainThreadScheduler {
     40     WTF_MAKE_NONCOPYABLE(PluginMainThreadScheduler); WTF_MAKE_FAST_ALLOCATED;
     41 public:
     42     typedef void MainThreadFunction(void*);
     43 
     44     static PluginMainThreadScheduler& scheduler();
     45 
     46     void scheduleCall(NPP, MainThreadFunction*, void* userData);
     47 
     48     void registerPlugin(NPP);
     49     void unregisterPlugin(NPP);
     50 
     51 private:
     52     PluginMainThreadScheduler();
     53     void dispatchCalls();
     54 
     55     class Call;
     56 
     57     void dispatchCallsForPlugin(NPP, const Deque<Call>& calls);
     58     typedef HashMap<NPP, Deque<Call> > CallQueueMap;
     59 
     60     static void mainThreadCallback(void* context);
     61 
     62     class Call {
     63     public:
     64         Call(MainThreadFunction* function, void* userData)
     65             : m_function(function)
     66             , m_userData(userData)
     67         {
     68         }
     69 
     70         void performCall() const
     71         {
     72             m_function(m_userData);
     73         }
     74 
     75     private:
     76         MainThreadFunction* m_function;
     77         void* m_userData;
     78     };
     79 
     80     bool m_callPending;
     81     CallQueueMap m_callQueueMap;
     82     Mutex m_queueMutex;
     83 };
     84 
     85 } // namespace WebCore
     86 
     87 #endif // PluginMainThreadScheduler_h
     88