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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/lazy_instance.h"
#include "base/logging.h"
#include "base/threading/thread_local.h"
namespace base {
namespace {
base::StaticAtomicSequenceNumber g_sequence_token_generator;
base::StaticAtomicSequenceNumber g_task_token_generator;
LazyInstance<ThreadLocalPointer<const SequenceToken>>::Leaky
tls_current_sequence_token = LAZY_INSTANCE_INITIALIZER;
LazyInstance<ThreadLocalPointer<const TaskToken>>::Leaky
tls_current_task_token = LAZY_INSTANCE_INITIALIZER;
} // 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 =
tls_current_sequence_token.Get().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 = tls_current_task_token.Get().Get();
return current_task_token ? *current_task_token : TaskToken();
}
ScopedSetSequenceTokenForCurrentThread::ScopedSetSequenceTokenForCurrentThread(
const SequenceToken& sequence_token)
: sequence_token_(sequence_token), task_token_(TaskToken::Create()) {
DCHECK(!tls_current_sequence_token.Get().Get());
DCHECK(!tls_current_task_token.Get().Get());
tls_current_sequence_token.Get().Set(&sequence_token_);
tls_current_task_token.Get().Set(&task_token_);
}
ScopedSetSequenceTokenForCurrentThread::
~ScopedSetSequenceTokenForCurrentThread() {
DCHECK_EQ(tls_current_sequence_token.Get().Get(), &sequence_token_);
DCHECK_EQ(tls_current_task_token.Get().Get(), &task_token_);
tls_current_sequence_token.Get().Set(nullptr);
tls_current_task_token.Get().Set(nullptr);
}
} // namespace base
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