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Side by Side Diff: webrtc/base/race_checker.h

Issue 2877023002: Move webrtc/{base => rtc_base} (Closed)
Patch Set: update presubmit.py and DEPS include rules Created 3 years, 5 months ago
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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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