84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_RACE_CHECKER_H_
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#define RTC_BASE_RACE_CHECKER_H_
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#include "rtc_base/checks.h"
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#include "rtc_base/platform_thread_types.h"
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#include "rtc_base/thread_annotations.h"
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namespace rtc {
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namespace internal {
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class RaceCheckerScope;
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} // namespace internal
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// Best-effort race-checking implementation. This primitive uses no
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// synchronization at all to be as-fast-as-possible in the non-racy case.
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class RTC_LOCKABLE RaceChecker {
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public:
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friend class internal::RaceCheckerScope;
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RaceChecker();
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private:
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bool Acquire() const RTC_EXCLUSIVE_LOCK_FUNCTION();
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void Release() const RTC_UNLOCK_FUNCTION();
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// Volatile to prevent code being optimized away in Acquire()/Release().
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mutable volatile int access_count_ = 0;
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mutable volatile PlatformThreadRef accessing_thread_;
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};
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namespace internal {
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class RTC_SCOPED_LOCKABLE RaceCheckerScope {
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public:
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explicit RaceCheckerScope(const RaceChecker* race_checker)
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RTC_EXCLUSIVE_LOCK_FUNCTION(race_checker);
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bool RaceDetected() const;
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~RaceCheckerScope() RTC_UNLOCK_FUNCTION();
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private:
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const RaceChecker* const race_checker_;
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const bool race_check_ok_;
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};
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class RTC_SCOPED_LOCKABLE RaceCheckerScopeDoNothing {
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public:
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explicit RaceCheckerScopeDoNothing(const RaceChecker* race_checker)
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RTC_EXCLUSIVE_LOCK_FUNCTION(race_checker) {}
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~RaceCheckerScopeDoNothing() RTC_UNLOCK_FUNCTION() {}
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};
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} // namespace internal
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} // namespace rtc
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#define RTC_CHECK_RUNS_SERIALIZED(x) RTC_CHECK_RUNS_SERIALIZED_NEXT(x, __LINE__)
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#define RTC_CHECK_RUNS_SERIALIZED_NEXT(x, suffix) \
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RTC_CHECK_RUNS_SERIALIZED_IMPL(x, suffix)
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#define RTC_CHECK_RUNS_SERIALIZED_IMPL(x, suffix) \
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rtc::internal::RaceCheckerScope race_checker##suffix(x); \
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RTC_CHECK(!race_checker##suffix.RaceDetected())
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#if RTC_DCHECK_IS_ON
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#define RTC_DCHECK_RUNS_SERIALIZED(x) \
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rtc::internal::RaceCheckerScope race_checker(x); \
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RTC_DCHECK(!race_checker.RaceDetected())
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#else
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#define RTC_DCHECK_RUNS_SERIALIZED(x) \
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rtc::internal::RaceCheckerScopeDoNothing race_checker(x)
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#endif
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#endif // RTC_BASE_RACE_CHECKER_H_
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