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1 /* | 1 /* |
2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
11 #ifndef WEBRTC_BASE_RACE_CHECKER_H_ | 11 #ifndef WEBRTC_BASE_RACE_CHECKER_H_ |
12 #define WEBRTC_BASE_RACE_CHECKER_H_ | 12 #define WEBRTC_BASE_RACE_CHECKER_H_ |
13 | 13 |
14 #include "webrtc/base/checks.h" | |
15 #include "webrtc/base/platform_thread.h" | |
16 #include "webrtc/base/thread_annotations.h" | |
17 | 14 |
18 namespace rtc { | 15 // This header is deprecated and is just left here temporarily during |
19 | 16 // refactoring. See https://bugs.webrtc.org/7634 for more details. |
20 namespace internal { | 17 #include "webrtc/rtc_base/race_checker.h" |
21 class RaceCheckerScope; | |
22 } // namespace internal | |
23 | |
24 // Best-effort race-checking implementation. This primitive uses no | |
25 // synchronization at all to be as-fast-as-possible in the non-racy case. | |
26 class LOCKABLE RaceChecker { | |
27 public: | |
28 friend class internal::RaceCheckerScope; | |
29 RaceChecker(); | |
30 | |
31 private: | |
32 bool Acquire() const EXCLUSIVE_LOCK_FUNCTION(); | |
33 void Release() const UNLOCK_FUNCTION(); | |
34 | |
35 // Volatile to prevent code being optimized away in Acquire()/Release(). | |
36 mutable volatile int access_count_ = 0; | |
37 mutable volatile PlatformThreadRef accessing_thread_; | |
38 }; | |
39 | |
40 namespace internal { | |
41 class SCOPED_LOCKABLE RaceCheckerScope { | |
42 public: | |
43 explicit RaceCheckerScope(const RaceChecker* race_checker) | |
44 EXCLUSIVE_LOCK_FUNCTION(race_checker); | |
45 | |
46 bool RaceDetected() const; | |
47 ~RaceCheckerScope() UNLOCK_FUNCTION(); | |
48 | |
49 private: | |
50 const RaceChecker* const race_checker_; | |
51 const bool race_check_ok_; | |
52 }; | |
53 | |
54 class SCOPED_LOCKABLE RaceCheckerScopeDoNothing { | |
55 public: | |
56 explicit RaceCheckerScopeDoNothing(const RaceChecker* race_checker) | |
57 EXCLUSIVE_LOCK_FUNCTION(race_checker) {} | |
58 | |
59 ~RaceCheckerScopeDoNothing() UNLOCK_FUNCTION() {} | |
60 }; | |
61 | |
62 } // namespace internal | |
63 } // namespace rtc | |
64 | |
65 #define RTC_CHECK_RUNS_SERIALIZED(x) \ | |
66 rtc::internal::RaceCheckerScope race_checker(x); \ | |
67 RTC_CHECK(!race_checker.RaceDetected()) | |
68 | |
69 #if RTC_DCHECK_IS_ON | |
70 #define RTC_DCHECK_RUNS_SERIALIZED(x) \ | |
71 rtc::internal::RaceCheckerScope race_checker(x); \ | |
72 RTC_DCHECK(!race_checker.RaceDetected()) | |
73 #else | |
74 #define RTC_DCHECK_RUNS_SERIALIZED(x) \ | |
75 rtc::internal::RaceCheckerScopeDoNothing race_checker(x) | |
76 #endif | |
77 | 18 |
78 #endif // WEBRTC_BASE_RACE_CHECKER_H_ | 19 #endif // WEBRTC_BASE_RACE_CHECKER_H_ |
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