91 lines
3.2 KiB
C
91 lines
3.2 KiB
C
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/*
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* Copyright 2020 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_SYNCHRONIZATION_SEQUENCE_CHECKER_INTERNAL_H_
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#define RTC_BASE_SYNCHRONIZATION_SEQUENCE_CHECKER_INTERNAL_H_
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#include <string>
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#include <type_traits>
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#include "api/task_queue/task_queue_base.h"
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#include "rtc_base/platform_thread_types.h"
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#include "rtc_base/synchronization/mutex.h"
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#include "rtc_base/system/rtc_export.h"
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#include "rtc_base/thread_annotations.h"
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namespace webrtc {
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namespace webrtc_sequence_checker_internal {
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// Real implementation of SequenceChecker, for use in debug mode, or
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// for temporary use in release mode (e.g. to RTC_CHECK on a threading issue
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// seen only in the wild).
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//
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// Note: You should almost always use the SequenceChecker class to get the
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// right version for your build configuration.
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class RTC_EXPORT SequenceCheckerImpl {
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public:
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explicit SequenceCheckerImpl(bool attach_to_current_thread);
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explicit SequenceCheckerImpl(TaskQueueBase* attached_queue);
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~SequenceCheckerImpl() = default;
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bool IsCurrent() const;
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// Changes the task queue or thread that is checked for in IsCurrent. This can
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// be useful when an object may be created on one task queue / thread and then
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// used exclusively on another thread.
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void Detach();
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// Returns a string that is formatted to match with the error string printed
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// by RTC_CHECK() when a condition is not met.
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// This is used in conjunction with the RTC_DCHECK_RUN_ON() macro.
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std::string ExpectationToString() const;
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private:
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mutable Mutex lock_;
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// These are mutable so that IsCurrent can set them.
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mutable bool attached_ RTC_GUARDED_BY(lock_);
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mutable rtc::PlatformThreadRef valid_thread_ RTC_GUARDED_BY(lock_);
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mutable const TaskQueueBase* valid_queue_ RTC_GUARDED_BY(lock_);
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};
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// Do nothing implementation, for use in release mode.
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//
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// Note: You should almost always use the SequenceChecker class to get the
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// right version for your build configuration.
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class SequenceCheckerDoNothing {
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public:
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explicit SequenceCheckerDoNothing(bool attach_to_current_thread) {}
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explicit SequenceCheckerDoNothing(TaskQueueBase* attached_queue) {}
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bool IsCurrent() const { return true; }
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void Detach() {}
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};
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template <typename ThreadLikeObject>
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std::enable_if_t<std::is_base_of_v<SequenceCheckerImpl, ThreadLikeObject>,
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std::string>
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ExpectationToString(const ThreadLikeObject* checker) {
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#if RTC_DCHECK_IS_ON
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return checker->ExpectationToString();
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#else
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return std::string();
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#endif
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}
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// Catch-all implementation for types other than explicitly supported above.
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template <typename ThreadLikeObject>
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std::enable_if_t<!std::is_base_of_v<SequenceCheckerImpl, ThreadLikeObject>,
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std::string>
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ExpectationToString(const ThreadLikeObject*) {
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return std::string();
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}
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} // namespace webrtc_sequence_checker_internal
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} // namespace webrtc
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#endif // RTC_BASE_SYNCHRONIZATION_SEQUENCE_CHECKER_INTERNAL_H_
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