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// Copyright (c) 2012 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_checker_impl.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/sequence_token.h"
#include "base/threading/sequenced_worker_pool.h"
#include "base/threading/thread_checker_impl.h"
namespace base {
class SequenceCheckerImpl::Core {
public:
Core()
: sequence_token_(SequenceToken::GetForCurrentThread()),
sequenced_worker_pool_token_(
SequencedWorkerPool::GetSequenceTokenForCurrentThread()) {
// SequencedWorkerPool doesn't use SequenceToken and code outside of
// SequenceWorkerPool doesn't set a SequencedWorkerPool token.
DCHECK(!sequence_token_.IsValid() ||
!sequenced_worker_pool_token_.IsValid());
}
~Core() = default;
bool CalledOnValidSequence() const {
if (sequence_token_.IsValid())
return sequence_token_ == SequenceToken::GetForCurrentThread();
if (sequenced_worker_pool_token_.IsValid()) {
return sequenced_worker_pool_token_.Equals(
SequencedWorkerPool::GetSequenceTokenForCurrentThread());
}
// SequenceChecker behaves as a ThreadChecker when it is not bound to a
// valid sequence token.
return thread_checker_.CalledOnValidThread();
}
private:
SequenceToken sequence_token_;
// TODO(gab): Remove this when SequencedWorkerPool is deprecated in favor of
// TaskScheduler. crbug.com/622400
SequencedWorkerPool::SequenceToken sequenced_worker_pool_token_;
// Used when |sequenced_worker_pool_token_| and |sequence_token_| are invalid.
ThreadCheckerImpl thread_checker_;
};
SequenceCheckerImpl::SequenceCheckerImpl() : core_(MakeUnique<Core>()) {}
SequenceCheckerImpl::~SequenceCheckerImpl() = default;
bool SequenceCheckerImpl::CalledOnValidSequence() const {
AutoLock auto_lock(lock_);
if (!core_)
core_ = MakeUnique<Core>();
return core_->CalledOnValidSequence();
}
void SequenceCheckerImpl::DetachFromSequence() {
AutoLock auto_lock(lock_);
core_.reset();
}
} // namespace base
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