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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"
namespace base {
SequenceCheckerImpl::SequenceCheckerImpl() {
AutoLock auto_lock(lock_);
EnsureSequenceTokenAssigned();
}
SequenceCheckerImpl::~SequenceCheckerImpl() = default;
bool SequenceCheckerImpl::CalledOnValidSequence() const {
AutoLock auto_lock(lock_);
EnsureSequenceTokenAssigned();
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();
}
void SequenceCheckerImpl::DetachFromSequence() {
AutoLock auto_lock(lock_);
is_assigned_ = false;
sequence_token_ = SequenceToken();
sequenced_worker_pool_token_ = SequencedWorkerPool::SequenceToken();
thread_checker_.DetachFromThread();
}
void SequenceCheckerImpl::EnsureSequenceTokenAssigned() const {
lock_.AssertAcquired();
if (is_assigned_)
return;
is_assigned_ = true;
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());
}
} // namespace base
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