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