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// Copyright (c) 2011 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/synchronization/atomic_flag.h"
#include "base/logging.h"
namespace base {
AtomicFlag::AtomicFlag() {
// It doesn't matter where the AtomicFlag is built so long as it's always
// Set() from the same sequence after. Note: the sequencing requirements are
// necessary for IsSet()'s callers to know which sequence's memory operations
// they are synchronized with.
set_sequence_checker_.DetachFromSequence();
}
void AtomicFlag::Set() {
DCHECK(set_sequence_checker_.CalledOnValidSequence());
base::subtle::Release_Store(&flag_, 1);
}
bool AtomicFlag::IsSet() const {
return base::subtle::Acquire_Load(&flag_) != 0;
}
void AtomicFlag::UnsafeResetForTesting() {
base::subtle::Release_Store(&flag_, 0);
}
} // namespace base
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