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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef PPAPI_PROXY_PPB_MESSAGE_LOOP_PROXY_H_
      6 #define PPAPI_PROXY_PPB_MESSAGE_LOOP_PROXY_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/bind.h"
     10 #include "base/memory/ref_counted.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "base/message_loop/message_loop.h"
     13 #include "ppapi/proxy/interface_proxy.h"
     14 #include "ppapi/proxy/ppapi_proxy_export.h"
     15 #include "ppapi/shared_impl/ppb_message_loop_shared.h"
     16 #include "ppapi/thunk/ppb_message_loop_api.h"
     17 
     18 struct PPB_MessageLoop_1_0;
     19 
     20 namespace ppapi {
     21 namespace proxy {
     22 
     23 class PPAPI_PROXY_EXPORT MessageLoopResource : public MessageLoopShared {
     24  public:
     25   explicit MessageLoopResource(PP_Instance instance);
     26   // Construct the one MessageLoopResource for the main thread. This must be
     27   // invoked on the main thread.
     28   explicit MessageLoopResource(ForMainThread);
     29   virtual ~MessageLoopResource();
     30 
     31   // Resource overrides.
     32   virtual thunk::PPB_MessageLoop_API* AsPPB_MessageLoop_API() OVERRIDE;
     33 
     34   // PPB_MessageLoop_API implementation.
     35   virtual int32_t AttachToCurrentThread() OVERRIDE;
     36   virtual int32_t Run() OVERRIDE;
     37   virtual int32_t PostWork(PP_CompletionCallback callback,
     38                            int64_t delay_ms) OVERRIDE;
     39   virtual int32_t PostQuit(PP_Bool should_destroy) OVERRIDE;
     40 
     41   static MessageLoopResource* GetCurrent();
     42   void DetachFromThread();
     43   bool is_main_thread_loop() const {
     44     return is_main_thread_loop_;
     45   }
     46 
     47   const scoped_refptr<base::MessageLoopProxy>& message_loop_proxy() {
     48     return loop_proxy_;
     49   }
     50 
     51  private:
     52   struct TaskInfo {
     53     tracked_objects::Location from_here;
     54     base::Closure closure;
     55     int64 delay_ms;
     56   };
     57 
     58   // Returns true if the object is associated with the current thread.
     59   bool IsCurrent() const;
     60 
     61   // Handles posting to the message loop if there is one, or the pending queue
     62   // if there isn't.
     63   // NOTE: The given closure will be run *WITHOUT* acquiring the Proxy lock.
     64   //       This only makes sense for user code and completely thread-safe
     65   //       proxy operations (e.g., MessageLoop::QuitClosure).
     66   virtual void PostClosure(const tracked_objects::Location& from_here,
     67                            const base::Closure& closure,
     68                            int64 delay_ms) OVERRIDE;
     69 
     70   virtual base::MessageLoopProxy* GetMessageLoopProxy() OVERRIDE;
     71 
     72   // TLS destructor function.
     73   static void ReleaseMessageLoop(void* value);
     74 
     75   // Created when we attach to the current thread, since MessageLoop assumes
     76   // that it's created on the thread it will run on. NULL for the main thread
     77   // loop, since that's owned by somebody else. This is needed for Run and Quit.
     78   // Any time we post tasks, we should post them using loop_proxy_.
     79   scoped_ptr<base::MessageLoop> loop_;
     80   scoped_refptr<base::MessageLoopProxy> loop_proxy_;
     81 
     82   // Number of invocations of Run currently on the stack.
     83   int nested_invocations_;
     84 
     85   // Set to true when the message loop is destroyed to prevent forther
     86   // posting of work.
     87   bool destroyed_;
     88 
     89   // Set to true if all message loop invocations should exit and that the
     90   // loop should be destroyed once it reaches the outermost Run invocation.
     91   bool should_destroy_;
     92 
     93   bool is_main_thread_loop_;
     94 
     95   // Since we allow tasks to be posted before the message loop is actually
     96   // created (when it's associated with a thread), we keep tasks posted here
     97   // until that happens. Once the loop_ is created, this is unused.
     98   std::vector<TaskInfo> pending_tasks_;
     99 
    100   DISALLOW_COPY_AND_ASSIGN(MessageLoopResource);
    101 };
    102 
    103 class PPB_MessageLoop_Proxy : public InterfaceProxy {
    104  public:
    105   explicit PPB_MessageLoop_Proxy(Dispatcher* dispatcher);
    106   virtual ~PPB_MessageLoop_Proxy();
    107 
    108   static const PPB_MessageLoop_1_0* GetInterface();
    109 
    110  private:
    111   DISALLOW_COPY_AND_ASSIGN(PPB_MessageLoop_Proxy);
    112 };
    113 
    114 }  // namespace proxy
    115 }  // namespace ppapi
    116 
    117 #endif  // PPAPI_PROXY_PPB_MESSAGE_LOOP_PROXY_H_
    118