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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_RTC_BASE_RACE_CHECKER_H_ | 11 #ifndef WEBRTC_RTC_BASE_RACE_CHECKER_H_ |
| 12 #define WEBRTC_RTC_BASE_RACE_CHECKER_H_ | 12 #define WEBRTC_RTC_BASE_RACE_CHECKER_H_ |
| 13 | 13 |
| 14 #include "webrtc/rtc_base/checks.h" | 14 #include "webrtc/rtc_base/checks.h" |
| 15 #include "webrtc/rtc_base/platform_thread.h" | 15 #include "webrtc/rtc_base/platform_thread.h" |
| 16 #include "webrtc/rtc_base/thread_annotations.h" | 16 #include "webrtc/rtc_base/thread_annotations.h" |
| 17 | 17 |
| 18 namespace rtc { | 18 namespace rtc { |
| 19 | 19 |
| 20 namespace internal { | 20 namespace internal { |
| 21 class RaceCheckerScope; | 21 class RaceCheckerScope; |
| 22 } // namespace internal | 22 } // namespace internal |
| 23 | 23 |
| 24 // Best-effort race-checking implementation. This primitive uses no | 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. | 25 // synchronization at all to be as-fast-as-possible in the non-racy case. |
| 26 class LOCKABLE RaceChecker { | 26 class RTC_LOCKABLE RaceChecker { |
| 27 public: | 27 public: |
| 28 friend class internal::RaceCheckerScope; | 28 friend class internal::RaceCheckerScope; |
| 29 RaceChecker(); | 29 RaceChecker(); |
| 30 | 30 |
| 31 private: | 31 private: |
| 32 bool Acquire() const EXCLUSIVE_LOCK_FUNCTION(); | 32 bool Acquire() const RTC_EXCLUSIVE_LOCK_FUNCTION(); |
| 33 void Release() const UNLOCK_FUNCTION(); | 33 void Release() const RTC_UNLOCK_FUNCTION(); |
| 34 | 34 |
| 35 // Volatile to prevent code being optimized away in Acquire()/Release(). | 35 // Volatile to prevent code being optimized away in Acquire()/Release(). |
| 36 mutable volatile int access_count_ = 0; | 36 mutable volatile int access_count_ = 0; |
| 37 mutable volatile PlatformThreadRef accessing_thread_; | 37 mutable volatile PlatformThreadRef accessing_thread_; |
| 38 }; | 38 }; |
| 39 | 39 |
| 40 namespace internal { | 40 namespace internal { |
| 41 class SCOPED_LOCKABLE RaceCheckerScope { | 41 class RTC_SCOPED_LOCKABLE RaceCheckerScope { |
| 42 public: | 42 public: |
| 43 explicit RaceCheckerScope(const RaceChecker* race_checker) | 43 explicit RaceCheckerScope(const RaceChecker* race_checker) |
| 44 EXCLUSIVE_LOCK_FUNCTION(race_checker); | 44 RTC_EXCLUSIVE_LOCK_FUNCTION(race_checker); |
| 45 | 45 |
| 46 bool RaceDetected() const; | 46 bool RaceDetected() const; |
| 47 ~RaceCheckerScope() UNLOCK_FUNCTION(); | 47 ~RaceCheckerScope() RTC_UNLOCK_FUNCTION(); |
| 48 | 48 |
| 49 private: | 49 private: |
| 50 const RaceChecker* const race_checker_; | 50 const RaceChecker* const race_checker_; |
| 51 const bool race_check_ok_; | 51 const bool race_check_ok_; |
| 52 }; | 52 }; |
| 53 | 53 |
| 54 class SCOPED_LOCKABLE RaceCheckerScopeDoNothing { | 54 class RTC_SCOPED_LOCKABLE RaceCheckerScopeDoNothing { |
| 55 public: | 55 public: |
| 56 explicit RaceCheckerScopeDoNothing(const RaceChecker* race_checker) | 56 explicit RaceCheckerScopeDoNothing(const RaceChecker* race_checker) |
| 57 EXCLUSIVE_LOCK_FUNCTION(race_checker) {} | 57 RTC_EXCLUSIVE_LOCK_FUNCTION(race_checker) {} |
| 58 | 58 |
| 59 ~RaceCheckerScopeDoNothing() UNLOCK_FUNCTION() {} | 59 ~RaceCheckerScopeDoNothing() RTC_UNLOCK_FUNCTION() {} |
| 60 }; | 60 }; |
| 61 | 61 |
| 62 } // namespace internal | 62 } // namespace internal |
| 63 } // namespace rtc | 63 } // namespace rtc |
| 64 | 64 |
| 65 #define RTC_CHECK_RUNS_SERIALIZED(x) \ | 65 #define RTC_CHECK_RUNS_SERIALIZED(x) \ |
| 66 rtc::internal::RaceCheckerScope race_checker(x); \ | 66 rtc::internal::RaceCheckerScope race_checker(x); \ |
| 67 RTC_CHECK(!race_checker.RaceDetected()) | 67 RTC_CHECK(!race_checker.RaceDetected()) |
| 68 | 68 |
| 69 #if RTC_DCHECK_IS_ON | 69 #if RTC_DCHECK_IS_ON |
| 70 #define RTC_DCHECK_RUNS_SERIALIZED(x) \ | 70 #define RTC_DCHECK_RUNS_SERIALIZED(x) \ |
| 71 rtc::internal::RaceCheckerScope race_checker(x); \ | 71 rtc::internal::RaceCheckerScope race_checker(x); \ |
| 72 RTC_DCHECK(!race_checker.RaceDetected()) | 72 RTC_DCHECK(!race_checker.RaceDetected()) |
| 73 #else | 73 #else |
| 74 #define RTC_DCHECK_RUNS_SERIALIZED(x) \ | 74 #define RTC_DCHECK_RUNS_SERIALIZED(x) \ |
| 75 rtc::internal::RaceCheckerScopeDoNothing race_checker(x) | 75 rtc::internal::RaceCheckerScopeDoNothing race_checker(x) |
| 76 #endif | 76 #endif |
| 77 | 77 |
| 78 #endif // WEBRTC_RTC_BASE_RACE_CHECKER_H_ | 78 #endif // WEBRTC_RTC_BASE_RACE_CHECKER_H_ |
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