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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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