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df5e4e0609
Introduces SequenceChecker, merging the functionality of ThreadChecker and SequencedTaskChecker. Also making the two latter use the former as the underlying implementation for backwards compatibility. This allows code that uses thread checker to accept running on a thread pool backed task queue. Bug: webrtc:10365 Change-Id: Ifefc4925694f263088a8a095fdf98a2407c62081 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/129721 Commit-Queue: Sebastian Jansson <srte@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27365}
65 lines
2 KiB
C++
65 lines
2 KiB
C++
/*
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* Copyright 2019 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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#include "rtc_base/synchronization/sequence_checker.h"
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#if defined(WEBRTC_MAC)
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#include <dispatch/dispatch.h>
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#endif
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namespace webrtc {
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namespace {
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// On Mac, returns the label of the current dispatch queue; elsewhere, return
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// null.
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const void* GetSystemQueueRef() {
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#if defined(WEBRTC_MAC)
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return dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL);
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#else
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return nullptr;
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#endif
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}
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} // namespace
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SequenceCheckerImpl::SequenceCheckerImpl()
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: attached_(true),
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valid_thread_(rtc::CurrentThreadRef()),
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valid_queue_(TaskQueueBase::Current()),
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valid_system_queue_(GetSystemQueueRef()) {}
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SequenceCheckerImpl::~SequenceCheckerImpl() = default;
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bool SequenceCheckerImpl::IsCurrent() const {
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const TaskQueueBase* const current_queue = TaskQueueBase::Current();
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const rtc::PlatformThreadRef current_thread = rtc::CurrentThreadRef();
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const void* const current_system_queue = GetSystemQueueRef();
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rtc::CritScope scoped_lock(&lock_);
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if (!attached_) { // Previously detached.
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attached_ = true;
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valid_thread_ = current_thread;
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valid_queue_ = current_queue;
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valid_system_queue_ = current_system_queue;
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return true;
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}
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if (valid_queue_ || current_queue) {
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return valid_queue_ == current_queue;
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}
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if (valid_system_queue_ && valid_system_queue_ == current_system_queue) {
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return true;
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}
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return rtc::IsThreadRefEqual(valid_thread_, current_thread);
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}
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void SequenceCheckerImpl::Detach() {
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rtc::CritScope scoped_lock(&lock_);
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attached_ = false;
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// We don't need to touch the other members here, they will be
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// reset on the next call to IsCurrent().
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}
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} // namespace webrtc
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