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
18struct PPB_MessageLoop_1_0;
19
20namespace ppapi {
21namespace proxy {
22
23class 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 private:
48  struct TaskInfo {
49    tracked_objects::Location from_here;
50    base::Closure closure;
51    int64 delay_ms;
52  };
53
54  // Returns true if the object is associated with the current thread.
55  bool IsCurrent() const;
56
57  // Handles posting to the message loop if there is one, or the pending queue
58  // if there isn't.
59  // NOTE: The given closure will be run *WITHOUT* acquiring the Proxy lock.
60  //       This only makes sense for user code and completely thread-safe
61  //       proxy operations (e.g., MessageLoop::QuitClosure).
62  virtual void PostClosure(const tracked_objects::Location& from_here,
63                           const base::Closure& closure,
64                           int64 delay_ms) OVERRIDE;
65
66  // TLS destructor function.
67  static void ReleaseMessageLoop(void* value);
68
69  // Created when we attach to the current thread, since MessageLoop assumes
70  // that it's created on the thread it will run on. NULL for the main thread
71  // loop, since that's owned by somebody else. This is needed for Run and Quit.
72  // Any time we post tasks, we should post them using loop_proxy_.
73  scoped_ptr<base::MessageLoop> loop_;
74  scoped_refptr<base::MessageLoopProxy> loop_proxy_;
75
76  // Number of invocations of Run currently on the stack.
77  int nested_invocations_;
78
79  // Set to true when the message loop is destroyed to prevent forther
80  // posting of work.
81  bool destroyed_;
82
83  // Set to true if all message loop invocations should exit and that the
84  // loop should be destroyed once it reaches the outermost Run invocation.
85  bool should_destroy_;
86
87  bool is_main_thread_loop_;
88
89  // Since we allow tasks to be posted before the message loop is actually
90  // created (when it's associated with a thread), we keep tasks posted here
91  // until that happens. Once the loop_ is created, this is unused.
92  std::vector<TaskInfo> pending_tasks_;
93
94  DISALLOW_COPY_AND_ASSIGN(MessageLoopResource);
95};
96
97class PPB_MessageLoop_Proxy : public InterfaceProxy {
98 public:
99  explicit PPB_MessageLoop_Proxy(Dispatcher* dispatcher);
100  virtual ~PPB_MessageLoop_Proxy();
101
102  static const PPB_MessageLoop_1_0* GetInterface();
103
104 private:
105  DISALLOW_COPY_AND_ASSIGN(PPB_MessageLoop_Proxy);
106};
107
108}  // namespace proxy
109}  // namespace ppapi
110
111#endif  // PPAPI_PROXY_PPB_MESSAGE_LOOP_PROXY_H_
112