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Side by Side Diff: base/synchronization/cancellation_flag.h

Issue 6747014: Base: Last set of files to use BASE_API (for base.dll) (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: Created 9 years, 9 months ago
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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_CANCELLATION_FLAG_H_ 5 #ifndef BASE_SYNCHRONIZATION_CANCELLATION_FLAG_H_
6 #define BASE_SYNCHRONIZATION_CANCELLATION_FLAG_H_ 6 #define BASE_SYNCHRONIZATION_CANCELLATION_FLAG_H_
7 #pragma once 7 #pragma once
8 8
9 #include "base/base_api.h"
9 #include "base/atomicops.h" 10 #include "base/atomicops.h"
10 #include "base/threading/platform_thread.h" 11 #include "base/threading/platform_thread.h"
11 12
12 namespace base { 13 namespace base {
13 14
14 // CancellationFlag allows one thread to cancel jobs executed on some worker 15 // 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 // thread. Calling Set() from one thread and IsSet() from a number of threads
16 // is thread-safe. 17 // is thread-safe.
17 // 18 //
18 // This class IS NOT intended for synchronization between threads. 19 // This class IS NOT intended for synchronization between threads.
19 class CancellationFlag { 20 class BASE_API CancellationFlag {
20 public: 21 public:
21 CancellationFlag() : flag_(false) { 22 CancellationFlag() : flag_(false) {
22 #if !defined(NDEBUG) 23 #if !defined(NDEBUG)
23 set_on_ = PlatformThread::CurrentId(); 24 set_on_ = PlatformThread::CurrentId();
24 #endif 25 #endif
25 } 26 }
26 ~CancellationFlag() {} 27 ~CancellationFlag() {}
27 28
28 // Set the flag. May only be called on the thread which owns the object. 29 // Set the flag. May only be called on the thread which owns the object.
29 void Set(); 30 void Set();
30 bool IsSet() const; // Returns true iff the flag was set. 31 bool IsSet() const; // Returns true iff the flag was set.
31 32
32 private: 33 private:
33 base::subtle::Atomic32 flag_; 34 base::subtle::Atomic32 flag_;
34 #if !defined(NDEBUG) 35 #if !defined(NDEBUG)
35 PlatformThreadId set_on_; 36 PlatformThreadId set_on_;
36 #endif 37 #endif
37 38
38 DISALLOW_COPY_AND_ASSIGN(CancellationFlag); 39 DISALLOW_COPY_AND_ASSIGN(CancellationFlag);
39 }; 40 };
40 41
41 } // namespace base 42 } // namespace base
42 43
43 #endif // BASE_SYNCHRONIZATION_CANCELLATION_FLAG_H_ 44 #endif // BASE_SYNCHRONIZATION_CANCELLATION_FLAG_H_
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