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1 // Copyright (c) 2010 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 BASE_CANCELLATION_FLAG_H_ | |
6 #define BASE_CANCELLATION_FLAG_H_ | |
7 #pragma once | |
8 | |
9 #include "base/atomicops.h" | |
10 #include "base/threading/platform_thread.h" | |
11 | |
12 namespace base { | |
13 | |
14 // CancellationFlag allows one thread to cancel jobs executed on some worker | |
15 // thread. Calling Set() from one thread and IsSet() from a number of threads | |
16 // is thread-safe. | |
17 // | |
18 // This class IS NOT intended for synchronization between threads. | |
19 class CancellationFlag { | |
20 public: | |
21 CancellationFlag() : flag_(false) { | |
22 #if !defined(NDEBUG) | |
23 set_on_ = PlatformThread::CurrentId(); | |
24 #endif | |
25 } | |
26 ~CancellationFlag() {} | |
27 | |
28 // Set the flag. May only be called on the thread which owns the object. | |
29 void Set(); | |
30 bool IsSet() const; // Returns true iff the flag was set. | |
31 | |
32 private: | |
33 base::subtle::Atomic32 flag_; | |
34 #if !defined(NDEBUG) | |
35 PlatformThreadId set_on_; | |
36 #endif | |
37 | |
38 DISALLOW_COPY_AND_ASSIGN(CancellationFlag); | |
39 }; | |
40 | |
41 } // namespace base | |
42 | |
43 #endif // BASE_CANCELLATION_FLAG_H_ | |
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