97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/sequence_token.h"
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#include "base/atomic_sequence_num.h"
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#include "base/logging.h"
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#include "base/no_destructor.h"
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#include "base/threading/thread_local.h"
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namespace base {
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namespace {
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base::AtomicSequenceNumber g_sequence_token_generator;
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base::AtomicSequenceNumber g_task_token_generator;
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ThreadLocalPointer<const SequenceToken>& GetTlsCurrentSequenceToken() {
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static base::NoDestructor<ThreadLocalPointer<const SequenceToken>> instance;
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return *instance;
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}
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ThreadLocalPointer<const TaskToken>& GetTlsCurrentTaskToken() {
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static base::NoDestructor<ThreadLocalPointer<const TaskToken>> instance;
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return *instance;
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}
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} // namespace
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bool SequenceToken::operator==(const SequenceToken& other) const {
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return token_ == other.token_ && IsValid();
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}
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bool SequenceToken::operator!=(const SequenceToken& other) const {
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return !(*this == other);
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}
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bool SequenceToken::IsValid() const {
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return token_ != kInvalidSequenceToken;
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}
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int SequenceToken::ToInternalValue() const {
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return token_;
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}
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SequenceToken SequenceToken::Create() {
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return SequenceToken(g_sequence_token_generator.GetNext());
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}
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SequenceToken SequenceToken::GetForCurrentThread() {
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const SequenceToken* current_sequence_token =
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GetTlsCurrentSequenceToken().Get();
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return current_sequence_token ? *current_sequence_token : SequenceToken();
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}
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bool TaskToken::operator==(const TaskToken& other) const {
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return token_ == other.token_ && IsValid();
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}
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bool TaskToken::operator!=(const TaskToken& other) const {
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return !(*this == other);
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}
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bool TaskToken::IsValid() const {
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return token_ != kInvalidTaskToken;
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}
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TaskToken TaskToken::Create() {
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return TaskToken(g_task_token_generator.GetNext());
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}
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TaskToken TaskToken::GetForCurrentThread() {
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const TaskToken* current_task_token = GetTlsCurrentTaskToken().Get();
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return current_task_token ? *current_task_token : TaskToken();
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}
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ScopedSetSequenceTokenForCurrentThread::ScopedSetSequenceTokenForCurrentThread(
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const SequenceToken& sequence_token)
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: sequence_token_(sequence_token), task_token_(TaskToken::Create()) {
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DCHECK(!GetTlsCurrentSequenceToken().Get());
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DCHECK(!GetTlsCurrentTaskToken().Get());
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GetTlsCurrentSequenceToken().Set(&sequence_token_);
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GetTlsCurrentTaskToken().Set(&task_token_);
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}
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ScopedSetSequenceTokenForCurrentThread::
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~ScopedSetSequenceTokenForCurrentThread() {
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DCHECK_EQ(GetTlsCurrentSequenceToken().Get(), &sequence_token_);
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DCHECK_EQ(GetTlsCurrentTaskToken().Get(), &task_token_);
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GetTlsCurrentSequenceToken().Set(nullptr);
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GetTlsCurrentTaskToken().Set(nullptr);
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}
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} // namespace base
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