1 // Copyright 2016 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "base/sequence_token.h"
7 #include "base/atomic_sequence_num.h"
8 #include "base/check_op.h"
9 #include "base/no_destructor.h"
10 #include "base/threading/thread_local.h"
16 base::AtomicSequenceNumber g_sequence_token_generator;
18 base::AtomicSequenceNumber g_task_token_generator;
20 ThreadLocalPointer<const SequenceToken>& GetTlsCurrentSequenceToken() {
21 static base::NoDestructor<ThreadLocalPointer<const SequenceToken>> instance;
25 ThreadLocalPointer<const TaskToken>& GetTlsCurrentTaskToken() {
26 static base::NoDestructor<ThreadLocalPointer<const TaskToken>> instance;
32 bool SequenceToken::operator==(const SequenceToken& other) const {
33 return token_ == other.token_ && IsValid();
36 bool SequenceToken::operator!=(const SequenceToken& other) const {
37 return !(*this == other);
40 bool SequenceToken::IsValid() const {
41 return token_ != kInvalidSequenceToken;
44 int SequenceToken::ToInternalValue() const {
48 SequenceToken SequenceToken::Create() {
49 return SequenceToken(g_sequence_token_generator.GetNext());
52 SequenceToken SequenceToken::GetForCurrentThread() {
53 const SequenceToken* current_sequence_token =
54 GetTlsCurrentSequenceToken().Get();
55 return current_sequence_token ? *current_sequence_token : SequenceToken();
58 bool TaskToken::operator==(const TaskToken& other) const {
59 return token_ == other.token_ && IsValid();
62 bool TaskToken::operator!=(const TaskToken& other) const {
63 return !(*this == other);
66 bool TaskToken::IsValid() const {
67 return token_ != kInvalidTaskToken;
70 TaskToken TaskToken::Create() {
71 return TaskToken(g_task_token_generator.GetNext());
74 TaskToken TaskToken::GetForCurrentThread() {
75 const TaskToken* current_task_token = GetTlsCurrentTaskToken().Get();
76 return current_task_token ? *current_task_token : TaskToken();
79 ScopedSetSequenceTokenForCurrentThread::ScopedSetSequenceTokenForCurrentThread(
80 const SequenceToken& sequence_token)
81 : sequence_token_(sequence_token), task_token_(TaskToken::Create()) {
82 DCHECK(!GetTlsCurrentSequenceToken().Get());
83 DCHECK(!GetTlsCurrentTaskToken().Get());
84 GetTlsCurrentSequenceToken().Set(&sequence_token_);
85 GetTlsCurrentTaskToken().Set(&task_token_);
88 ScopedSetSequenceTokenForCurrentThread::
89 ~ScopedSetSequenceTokenForCurrentThread() {
90 DCHECK_EQ(GetTlsCurrentSequenceToken().Get(), &sequence_token_);
91 DCHECK_EQ(GetTlsCurrentTaskToken().Get(), &task_token_);
92 GetTlsCurrentSequenceToken().Set(nullptr);
93 GetTlsCurrentTaskToken().Set(nullptr);