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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_MESSAGE_LOOP_PROXY_H_ | 5 #ifndef BASE_MESSAGE_LOOP_PROXY_H_ |
6 #define BASE_MESSAGE_LOOP_PROXY_H_ | 6 #define BASE_MESSAGE_LOOP_PROXY_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
| 9 #include "base/base_api.h" |
9 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
10 #include "base/ref_counted.h" | 11 #include "base/ref_counted.h" |
11 #include "base/task.h" | 12 #include "base/task.h" |
12 | 13 |
13 namespace base { | 14 namespace base { |
14 | 15 |
15 struct MessageLoopProxyTraits; | 16 struct MessageLoopProxyTraits; |
16 | 17 |
17 // This class provides a thread-safe refcounted interface to the Post* methods | 18 // This class provides a thread-safe refcounted interface to the Post* methods |
18 // of a message loop. This class can outlive the target message loop. You can | 19 // of a message loop. This class can outlive the target message loop. You can |
19 // obtain a MessageLoopProxy via Thread::message_loop_proxy() or | 20 // obtain a MessageLoopProxy via Thread::message_loop_proxy() or |
20 // MessageLoopProxy::CreateForCurrentThread(). | 21 // MessageLoopProxy::CreateForCurrentThread(). |
21 class MessageLoopProxy | 22 class BASE_API MessageLoopProxy |
22 : public base::RefCountedThreadSafe<MessageLoopProxy, | 23 : public base::RefCountedThreadSafe<MessageLoopProxy, |
23 MessageLoopProxyTraits> { | 24 MessageLoopProxyTraits> { |
24 public: | 25 public: |
25 // These methods are the same as in message_loop.h, but are guaranteed to | 26 // These methods are the same as in message_loop.h, but are guaranteed to |
26 // either post the Task to the MessageLoop (if it's still alive), or to | 27 // either post the Task to the MessageLoop (if it's still alive), or to |
27 // delete the Task otherwise. | 28 // delete the Task otherwise. |
28 // They return true iff the thread existed and the task was posted. Note that | 29 // They return true iff the thread existed and the task was posted. Note that |
29 // even if the task is posted, there's no guarantee that it will run, since | 30 // even if the task is posted, there's no guarantee that it will run, since |
30 // the target thread may already have a Quit message in its queue. | 31 // the target thread may already have a Quit message in its queue. |
31 virtual bool PostTask(const tracked_objects::Location& from_here, | 32 virtual bool PostTask(const tracked_objects::Location& from_here, |
(...skipping 19 matching lines...) Expand all Loading... |
51 bool ReleaseSoon(const tracked_objects::Location& from_here, | 52 bool ReleaseSoon(const tracked_objects::Location& from_here, |
52 T* object) { | 53 T* object) { |
53 return PostNonNestableTask(from_here, new ReleaseTask<T>(object)); | 54 return PostNonNestableTask(from_here, new ReleaseTask<T>(object)); |
54 } | 55 } |
55 | 56 |
56 // Factory method for creating an implementation of MessageLoopProxy | 57 // Factory method for creating an implementation of MessageLoopProxy |
57 // for the current thread. | 58 // for the current thread. |
58 static scoped_refptr<MessageLoopProxy> CreateForCurrentThread(); | 59 static scoped_refptr<MessageLoopProxy> CreateForCurrentThread(); |
59 | 60 |
60 protected: | 61 protected: |
| 62 friend class RefCountedThreadSafe<MessageLoopProxy, MessageLoopProxyTraits>; |
61 friend struct MessageLoopProxyTraits; | 63 friend struct MessageLoopProxyTraits; |
62 | 64 |
63 MessageLoopProxy(); | 65 MessageLoopProxy(); |
64 virtual ~MessageLoopProxy(); | 66 virtual ~MessageLoopProxy(); |
65 | 67 |
66 // Called when the proxy is about to be deleted. Subclasses can override this | 68 // Called when the proxy is about to be deleted. Subclasses can override this |
67 // to provide deletion on specific threads. | 69 // to provide deletion on specific threads. |
68 virtual void OnDestruct() const; | 70 virtual void OnDestruct() const; |
69 }; | 71 }; |
70 | 72 |
71 struct MessageLoopProxyTraits { | 73 struct MessageLoopProxyTraits { |
72 static void Destruct(const MessageLoopProxy* proxy) { | 74 static void Destruct(const MessageLoopProxy* proxy) { |
73 proxy->OnDestruct(); | 75 proxy->OnDestruct(); |
74 } | 76 } |
75 }; | 77 }; |
76 | 78 |
77 } // namespace base | 79 } // namespace base |
78 | 80 |
79 #endif // BASE_MESSAGE_LOOP_PROXY_H_ | 81 #endif // BASE_MESSAGE_LOOP_PROXY_H_ |
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