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1 // Copyright (c) 2011 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_SYNCHRONIZATION_WAITABLE_EVENT_WATCHER_H_ | 5 #ifndef BASE_SYNCHRONIZATION_WAITABLE_EVENT_WATCHER_H_ |
6 #define BASE_SYNCHRONIZATION_WAITABLE_EVENT_WATCHER_H_ | 6 #define BASE_SYNCHRONIZATION_WAITABLE_EVENT_WATCHER_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include "build/build_config.h" | 9 #include "build/build_config.h" |
10 | 10 |
11 #if defined(OS_WIN) | 11 #if defined(OS_WIN) |
12 #include "base/win/object_watcher.h" | 12 #include "base/win/object_watcher.h" |
13 #else | 13 #else |
14 #include "base/message_loop.h" | 14 #include "base/message_loop.h" |
15 #include "base/synchronization/waitable_event.h" | 15 #include "base/synchronization/waitable_event.h" |
16 #endif | 16 #endif |
17 | 17 |
18 #include "base/base_api.h" | 18 #include "base/base_export.h" |
19 | 19 |
20 namespace base { | 20 namespace base { |
21 | 21 |
22 class Flag; | 22 class Flag; |
23 class AsyncWaiter; | 23 class AsyncWaiter; |
24 class AsyncCallbackTask; | 24 class AsyncCallbackTask; |
25 class WaitableEvent; | 25 class WaitableEvent; |
26 | 26 |
27 // ----------------------------------------------------------------------------- | 27 // ----------------------------------------------------------------------------- |
28 // This class provides a way to wait on a WaitableEvent asynchronously. | 28 // This class provides a way to wait on a WaitableEvent asynchronously. |
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53 // | 53 // |
54 // BEWARE: With automatically reset WaitableEvents, a signal may be lost if it | 54 // BEWARE: With automatically reset WaitableEvents, a signal may be lost if it |
55 // occurs just before a WaitableEventWatcher is deleted. There is currently no | 55 // occurs just before a WaitableEventWatcher is deleted. There is currently no |
56 // safe way to stop watching an automatic reset WaitableEvent without possibly | 56 // safe way to stop watching an automatic reset WaitableEvent without possibly |
57 // missing a signal. | 57 // missing a signal. |
58 // | 58 // |
59 // NOTE: you /are/ allowed to delete the WaitableEvent while still waiting on | 59 // NOTE: you /are/ allowed to delete the WaitableEvent while still waiting on |
60 // it with a Watcher. It will act as if the event was never signaled. | 60 // it with a Watcher. It will act as if the event was never signaled. |
61 // ----------------------------------------------------------------------------- | 61 // ----------------------------------------------------------------------------- |
62 | 62 |
63 class BASE_API WaitableEventWatcher | 63 class BASE_EXPORT WaitableEventWatcher |
64 #if defined(OS_POSIX) | 64 #if defined(OS_POSIX) |
65 : public MessageLoop::DestructionObserver | 65 : public MessageLoop::DestructionObserver |
66 #endif | 66 #endif |
67 { | 67 { |
68 public: | 68 public: |
69 | 69 |
70 WaitableEventWatcher(); | 70 WaitableEventWatcher(); |
71 virtual ~WaitableEventWatcher(); | 71 virtual ~WaitableEventWatcher(); |
72 | 72 |
73 class Delegate { | 73 class Delegate { |
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155 #endif | 155 #endif |
156 | 156 |
157 WaitableEvent* event_; | 157 WaitableEvent* event_; |
158 | 158 |
159 Delegate* delegate_; | 159 Delegate* delegate_; |
160 }; | 160 }; |
161 | 161 |
162 } // namespace base | 162 } // namespace base |
163 | 163 |
164 #endif // BASE_SYNCHRONIZATION_WAITABLE_EVENT_WATCHER_H_ | 164 #endif // BASE_SYNCHRONIZATION_WAITABLE_EVENT_WATCHER_H_ |
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