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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 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 #include "base/synchronization/waitable_event_watcher.h" | 5 #include "base/synchronization/waitable_event_watcher.h" |
6 | 6 |
7 #include "base/bind.h" | 7 #include "base/bind.h" |
8 #include "base/location.h" | 8 #include "base/location.h" |
9 #include "base/message_loop/message_loop.h" | 9 #include "base/message_loop/message_loop.h" |
10 #include "base/synchronization/lock.h" | 10 #include "base/synchronization/lock.h" |
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58 // ----------------------------------------------------------------------------- | 58 // ----------------------------------------------------------------------------- |
59 class AsyncWaiter : public WaitableEvent::Waiter { | 59 class AsyncWaiter : public WaitableEvent::Waiter { |
60 public: | 60 public: |
61 AsyncWaiter(MessageLoop* message_loop, | 61 AsyncWaiter(MessageLoop* message_loop, |
62 const base::Closure& callback, | 62 const base::Closure& callback, |
63 Flag* flag) | 63 Flag* flag) |
64 : message_loop_(message_loop), | 64 : message_loop_(message_loop), |
65 callback_(callback), | 65 callback_(callback), |
66 flag_(flag) { } | 66 flag_(flag) { } |
67 | 67 |
68 virtual bool Fire(WaitableEvent* event) OVERRIDE { | 68 bool Fire(WaitableEvent* event) override { |
69 // Post the callback if we haven't been cancelled. | 69 // Post the callback if we haven't been cancelled. |
70 if (!flag_->value()) { | 70 if (!flag_->value()) { |
71 message_loop_->PostTask(FROM_HERE, callback_); | 71 message_loop_->PostTask(FROM_HERE, callback_); |
72 } | 72 } |
73 | 73 |
74 // We are removed from the wait-list by the WaitableEvent itself. It only | 74 // We are removed from the wait-list by the WaitableEvent itself. It only |
75 // remains to delete ourselves. | 75 // remains to delete ourselves. |
76 delete this; | 76 delete this; |
77 | 77 |
78 // We can always return true because an AsyncWaiter is never in two | 78 // We can always return true because an AsyncWaiter is never in two |
79 // different wait-lists at the same time. | 79 // different wait-lists at the same time. |
80 return true; | 80 return true; |
81 } | 81 } |
82 | 82 |
83 // See StopWatching for discussion | 83 // See StopWatching for discussion |
84 virtual bool Compare(void* tag) OVERRIDE { | 84 bool Compare(void* tag) override { return tag == flag_.get(); } |
85 return tag == flag_.get(); | |
86 } | |
87 | 85 |
88 private: | 86 private: |
89 MessageLoop *const message_loop_; | 87 MessageLoop *const message_loop_; |
90 base::Closure callback_; | 88 base::Closure callback_; |
91 scoped_refptr<Flag> flag_; | 89 scoped_refptr<Flag> flag_; |
92 }; | 90 }; |
93 | 91 |
94 // ----------------------------------------------------------------------------- | 92 // ----------------------------------------------------------------------------- |
95 // For async waits we need to make a callback in a MessageLoop thread. We do | 93 // For async waits we need to make a callback in a MessageLoop thread. We do |
96 // this by posting a callback, which calls the delegate and keeps track of when | 94 // this by posting a callback, which calls the delegate and keeps track of when |
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262 // ----------------------------------------------------------------------------- | 260 // ----------------------------------------------------------------------------- |
263 // This is called when the MessageLoop which the callback will be run it is | 261 // This is called when the MessageLoop which the callback will be run it is |
264 // deleted. We need to cancel the callback as if we had been deleted, but we | 262 // deleted. We need to cancel the callback as if we had been deleted, but we |
265 // will still be deleted at some point in the future. | 263 // will still be deleted at some point in the future. |
266 // ----------------------------------------------------------------------------- | 264 // ----------------------------------------------------------------------------- |
267 void WaitableEventWatcher::WillDestroyCurrentMessageLoop() { | 265 void WaitableEventWatcher::WillDestroyCurrentMessageLoop() { |
268 StopWatching(); | 266 StopWatching(); |
269 } | 267 } |
270 | 268 |
271 } // namespace base | 269 } // namespace base |
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