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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   void set_currently_handling_blocking_message(bool handling_blocking_message) {
     52     currently_handling_blocking_message_ = handling_blocking_message;
     53   }
     54 
     55  private:
     56   struct TaskInfo {
     57     tracked_objects::Location from_here;
     58     base::Closure closure;
     59     int64 delay_ms;
     60   };
     61 
     62   // Returns true if the object is associated with the current thread.
     63   bool IsCurrent() const;
     64 
     65   // MessageLoopShared implementation.
     66   //
     67   // Handles posting to the message loop if there is one, or the pending queue
     68   // if there isn't.
     69   // NOTE: The given closure will be run *WITHOUT* acquiring the Proxy lock.
     70   //       This only makes sense for user code and completely thread-safe
     71   //       proxy operations (e.g., MessageLoop::QuitClosure).
     72   virtual void PostClosure(const tracked_objects::Location& from_here,
     73                            const base::Closure& closure,
     74                            int64 delay_ms) OVERRIDE;
     75   virtual base::MessageLoopProxy* GetMessageLoopProxy() OVERRIDE;
     76   virtual bool CurrentlyHandlingBlockingMessage() OVERRIDE;
     77 
     78   // TLS destructor function.
     79   static void ReleaseMessageLoop(void* value);
     80 
     81   // Created when we attach to the current thread, since MessageLoop assumes
     82   // that it's created on the thread it will run on. NULL for the main thread
     83   // loop, since that's owned by somebody else. This is needed for Run and Quit.
     84   // Any time we post tasks, we should post them using loop_proxy_.
     85   scoped_ptr<base::MessageLoop> loop_;
     86   scoped_refptr<base::MessageLoopProxy> loop_proxy_;
     87 
     88   // Number of invocations of Run currently on the stack.
     89   int nested_invocations_;
     90 
     91   // Set to true when the message loop is destroyed to prevent forther
     92   // posting of work.
     93   bool destroyed_;
     94 
     95   // Set to true if all message loop invocations should exit and that the
     96   // loop should be destroyed once it reaches the outermost Run invocation.
     97   bool should_destroy_;
     98 
     99   bool is_main_thread_loop_;
    100 
    101   bool currently_handling_blocking_message_;
    102 
    103   // Since we allow tasks to be posted before the message loop is actually
    104   // created (when it's associated with a thread), we keep tasks posted here
    105   // until that happens. Once the loop_ is created, this is unused.
    106   std::vector<TaskInfo> pending_tasks_;
    107 
    108   DISALLOW_COPY_AND_ASSIGN(MessageLoopResource);
    109 };
    110 
    111 class PPB_MessageLoop_Proxy : public InterfaceProxy {
    112  public:
    113   explicit PPB_MessageLoop_Proxy(Dispatcher* dispatcher);
    114   virtual ~PPB_MessageLoop_Proxy();
    115 
    116   static const PPB_MessageLoop_1_0* GetInterface();
    117 
    118  private:
    119   DISALLOW_COPY_AND_ASSIGN(PPB_MessageLoop_Proxy);
    120 };
    121 
    122 }  // namespace proxy
    123 }  // namespace ppapi
    124 
    125 #endif  // PPAPI_PROXY_PPB_MESSAGE_LOOP_PROXY_H_
    126