86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
|
// Copyright 2016 The Chromium Authors
|
||
|
|
// 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 "third_party/abseil-cpp/absl/base/attributes.h"
|
||
|
|
|
||
|
|
namespace base {
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
|
||
|
|
base::AtomicSequenceNumber g_sequence_token_generator;
|
||
|
|
|
||
|
|
base::AtomicSequenceNumber g_task_token_generator;
|
||
|
|
|
||
|
|
ABSL_CONST_INIT thread_local SequenceToken current_sequence_token;
|
||
|
|
ABSL_CONST_INIT thread_local TaskToken current_task_token;
|
||
|
|
|
||
|
|
} // 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() {
|
||
|
|
return current_sequence_token;
|
||
|
|
}
|
||
|
|
|
||
|
|
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() {
|
||
|
|
return current_task_token;
|
||
|
|
}
|
||
|
|
|
||
|
|
ScopedSetSequenceTokenForCurrentThread::ScopedSetSequenceTokenForCurrentThread(
|
||
|
|
const SequenceToken& sequence_token)
|
||
|
|
// The lambdas here exist because invalid tokens don't compare equal, so
|
||
|
|
// passing invalid sequence/task tokens as the third args to AutoReset
|
||
|
|
// constructors doesn't work.
|
||
|
|
: sequence_token_resetter_(¤t_sequence_token,
|
||
|
|
[&sequence_token]() {
|
||
|
|
DCHECK(!current_sequence_token.IsValid());
|
||
|
|
return sequence_token;
|
||
|
|
}()),
|
||
|
|
task_token_resetter_(¤t_task_token, [] {
|
||
|
|
DCHECK(!current_task_token.IsValid());
|
||
|
|
return TaskToken::Create();
|
||
|
|
}()) {}
|
||
|
|
|
||
|
|
ScopedSetSequenceTokenForCurrentThread::
|
||
|
|
~ScopedSetSequenceTokenForCurrentThread() = default;
|
||
|
|
|
||
|
|
} // namespace base
|