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113 lines
3.6 KiB
113 lines
3.6 KiB
4 months ago
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/*
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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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#include "rtc_base/strings/string_builder.h"
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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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std::string ExpectationToString(const webrtc::SequenceChecker* checker) {
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#if RTC_DCHECK_IS_ON
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return checker->ExpectationToString();
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#endif
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return std::string();
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}
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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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MutexLock 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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MutexLock 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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#if RTC_DCHECK_IS_ON
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std::string SequenceCheckerImpl::ExpectationToString() 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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MutexLock scoped_lock(&lock_);
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if (!attached_)
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return "Checker currently not attached.";
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// The format of the string is meant to compliment the one we have inside of
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// FatalLog() (checks.cc). Example:
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//
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// # Expected: TQ: 0x0 SysQ: 0x7fff69541330 Thread: 0x11dcf6dc0
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// # Actual: TQ: 0x7fa8f0604190 SysQ: 0x7fa8f0604a30 Thread: 0x700006f1a000
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// TaskQueue doesn't match
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rtc::StringBuilder message;
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message.AppendFormat(
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"# Expected: TQ: %p SysQ: %p Thread: %p\n"
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"# Actual: TQ: %p SysQ: %p Thread: %p\n",
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valid_queue_, valid_system_queue_,
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reinterpret_cast<const void*>(valid_thread_), current_queue,
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current_system_queue, reinterpret_cast<const void*>(current_thread));
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if ((valid_queue_ || current_queue) && valid_queue_ != current_queue) {
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message << "TaskQueue doesn't match\n";
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} else if (valid_system_queue_ &&
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valid_system_queue_ != current_system_queue) {
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message << "System queue doesn't match\n";
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} else if (!rtc::IsThreadRefEqual(valid_thread_, current_thread)) {
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message << "Threads don't match\n";
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}
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return message.Release();
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}
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#endif // RTC_DCHECK_IS_ON
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} // namespace webrtc
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