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106 lines
2.9 KiB
C++
106 lines
2.9 KiB
C++
// Copyright 2016 The Chromium Authors
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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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namespace base {
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namespace internal {
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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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constinit thread_local SequenceToken current_sequence_token;
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constinit thread_local TaskToken current_task_token;
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constinit thread_local bool current_task_is_thread_bound = true;
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constinit thread_local bool current_task_is_running_synchronously = false;
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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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if (!current_sequence_token.IsValid()) {
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current_sequence_token = SequenceToken::Create();
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DCHECK(current_task_is_thread_bound);
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}
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return current_sequence_token;
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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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return current_task_token;
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}
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bool CurrentTaskIsThreadBound() {
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return current_task_is_thread_bound;
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}
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TaskScope::TaskScope(SequenceToken sequence_token,
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bool is_single_threaded,
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bool is_running_synchronously)
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: previous_task_token_(TaskToken::GetForCurrentThread()),
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previous_sequence_token_(SequenceToken::GetForCurrentThread()),
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previous_task_is_thread_bound_(current_task_is_thread_bound),
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previous_task_is_running_synchronously_(
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current_task_is_running_synchronously) {
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current_task_token = TaskToken::Create();
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current_sequence_token = sequence_token;
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current_task_is_thread_bound = is_single_threaded;
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current_task_is_running_synchronously = is_running_synchronously;
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}
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TaskScope::~TaskScope() {
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current_task_token = previous_task_token_;
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current_sequence_token = previous_sequence_token_;
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current_task_is_thread_bound = previous_task_is_thread_bound_;
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current_task_is_running_synchronously =
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previous_task_is_running_synchronously_;
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}
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} // namespace internal
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bool CurrentTaskIsRunningSynchronously() {
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return internal::current_task_is_running_synchronously;
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}
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} // namespace base
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