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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 : public Noncopyable {
     40 public:
     41     typedef void MainThreadFunction(void*);
     42 
     43     static PluginMainThreadScheduler& scheduler();
     44 
     45     void scheduleCall(NPP, MainThreadFunction*, void* userData);
     46 
     47     void registerPlugin(NPP);
     48     void unregisterPlugin(NPP);
     49 
     50 private:
     51     PluginMainThreadScheduler();
     52     void dispatchCalls();
     53 
     54     class Call;
     55 
     56     void dispatchCallsForPlugin(NPP, const Deque<Call>& calls);
     57     typedef HashMap<NPP, Deque<Call> > CallQueueMap;
     58 
     59     static void mainThreadCallback(void* context);
     60 
     61     class Call {
     62     public:
     63         Call(MainThreadFunction* function, void* userData)
     64             : m_function(function)
     65             , m_userData(userData)
     66         {
     67         }
     68 
     69         void performCall() const
     70         {
     71             m_function(m_userData);
     72         }
     73 
     74     private:
     75         MainThreadFunction* m_function;
     76         void* m_userData;
     77     };
     78 
     79     bool m_callPending;
     80     CallQueueMap m_callQueueMap;
     81     Mutex m_queueMutex;
     82 };
     83 
     84 } // namespace WebCore
     85 
     86 #endif // PluginMainThreadScheduler_h
     87