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f70fbc8411
This change introduces a new non-reentrant mutex to WebRTC. It enables eventual migration to Abseil's mutex. The mutex types supportable by webrtc::Mutex are - absl::Mutex - CriticalSection (Windows only) - pthread_mutex (POSIX only) In addition to introducing the mutexes, the CL also changes PacketBuffer to use the new mutex instead of rtc::CriticalSection. The method of yielding from critical_section.cc was given a mini-cleanup and YieldCurrentThread() was added to rtc_base/synchronization/yield.h/cc. Additionally, google_benchmark benchmarks for the mutexes were added (test courtesy of danilchap@), and some results from a pthread/Abseil shootout were added showing Abseil has the advantage in higher contention. Bug: webrtc:11567, webrtc:11634 Change-Id: Iaec324ccb32ec3851bf6db3fd290f5ea5dee4c81 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176230 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Tommi <tommi@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31443}
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
/*
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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_MUTEX_PTHREAD_H_
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#define RTC_BASE_SYNCHRONIZATION_MUTEX_PTHREAD_H_
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#if defined(WEBRTC_POSIX)
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#include <pthread.h>
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#if defined(WEBRTC_MAC)
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#include <pthread_spis.h>
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#endif
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#include "rtc_base/thread_annotations.h"
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namespace webrtc {
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class RTC_LOCKABLE MutexImpl final {
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public:
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MutexImpl() {
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pthread_mutexattr_t mutex_attribute;
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pthread_mutexattr_init(&mutex_attribute);
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#if defined(WEBRTC_MAC)
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pthread_mutexattr_setpolicy_np(&mutex_attribute,
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_PTHREAD_MUTEX_POLICY_FAIRSHARE);
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#endif
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pthread_mutex_init(&mutex_, &mutex_attribute);
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pthread_mutexattr_destroy(&mutex_attribute);
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}
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MutexImpl(const MutexImpl&) = delete;
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MutexImpl& operator=(const MutexImpl&) = delete;
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~MutexImpl() { pthread_mutex_destroy(&mutex_); }
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void Lock() RTC_EXCLUSIVE_LOCK_FUNCTION() { pthread_mutex_lock(&mutex_); }
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RTC_WARN_UNUSED_RESULT bool TryLock() RTC_EXCLUSIVE_TRYLOCK_FUNCTION(true) {
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return pthread_mutex_trylock(&mutex_) == 0;
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}
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void Unlock() RTC_UNLOCK_FUNCTION() { pthread_mutex_unlock(&mutex_); }
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private:
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pthread_mutex_t mutex_;
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};
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} // namespace webrtc
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#endif // #if defined(WEBRTC_POSIX)
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#endif // RTC_BASE_SYNCHRONIZATION_MUTEX_PTHREAD_H_
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