1 // Copyright (c) 2012 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_checker_impl.h"
7 #include "base/logging.h"
8 #include "base/memory/ptr_util.h"
9 #include "base/sequence_token.h"
10 #include "base/threading/thread_checker_impl.h"
14 class SequenceCheckerImpl::Core {
16 Core() : sequence_token_(SequenceToken::GetForCurrentThread()) {}
20 bool CalledOnValidSequence() const {
21 if (sequence_token_.IsValid())
22 return sequence_token_ == SequenceToken::GetForCurrentThread();
24 // SequenceChecker behaves as a ThreadChecker when it is not bound to a
25 // valid sequence token.
26 return thread_checker_.CalledOnValidThread();
30 SequenceToken sequence_token_;
32 // Used when |sequence_token_| is invalid.
33 ThreadCheckerImpl thread_checker_;
36 SequenceCheckerImpl::SequenceCheckerImpl() : core_(std::make_unique<Core>()) {}
37 SequenceCheckerImpl::~SequenceCheckerImpl() = default;
39 bool SequenceCheckerImpl::CalledOnValidSequence() const {
40 AutoLock auto_lock(lock_);
42 core_ = std::make_unique<Core>();
43 return core_->CalledOnValidSequence();
46 void SequenceCheckerImpl::DetachFromSequence() {
47 AutoLock auto_lock(lock_);