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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_SHARED_IMPL_PPB_MESSAGE_LOOP_SHARED_H_
      6 #define PPAPI_SHARED_IMPL_PPB_MESSAGE_LOOP_SHARED_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/callback_forward.h"
     10 #include "base/location.h"
     11 #include "ppapi/c/pp_instance.h"
     12 #include "ppapi/shared_impl/ppapi_shared_export.h"
     13 #include "ppapi/shared_impl/resource.h"
     14 #include "ppapi/thunk/ppb_message_loop_api.h"
     15 
     16 namespace tracked_objects {
     17 class Location;
     18 }
     19 
     20 namespace ppapi {
     21 
     22 // MessageLoopShared doesn't really do anything interesting. It exists so that
     23 // shared code (in particular, TrackedCallback) can keep a pointer to a
     24 // MessageLoop resource. In the host side, there is not a concrete class that
     25 // implements this. So pointers to MessageLoopShared can only really be valid
     26 // on the plugin side.
     27 class PPAPI_SHARED_EXPORT MessageLoopShared
     28     : public Resource,
     29       public thunk::PPB_MessageLoop_API {
     30  public:
     31   explicit MessageLoopShared(PP_Instance instance);
     32   // Construct the one MessageLoopShared for the main thread. This must be
     33   // invoked on the main thread.
     34   struct ForMainThread {};
     35   explicit MessageLoopShared(ForMainThread);
     36   virtual ~MessageLoopShared();
     37 
     38   // Handles posting to the message loop if there is one, or the pending queue
     39   // if there isn't.
     40   // NOTE: The given closure will be run *WITHOUT* acquiring the Proxy lock.
     41   //       This only makes sense for user code and completely thread-safe
     42   //       proxy operations (e.g., MessageLoop::QuitClosure).
     43   virtual void PostClosure(const tracked_objects::Location& from_here,
     44                            const base::Closure& closure,
     45                            int64 delay_ms) = 0;
     46 
     47   DISALLOW_COPY_AND_ASSIGN(MessageLoopShared);
     48 };
     49 
     50 }  // namespace ppapi
     51 
     52 #endif  // PPAPI_SHARED_IMPL_PPB_MESSAGE_LOOP_SHARED_H_
     53