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33 lines
928 B
C++
33 lines
928 B
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/synchronization/atomic_flag.h"
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#include "base/logging.h"
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namespace base {
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AtomicFlag::AtomicFlag() {
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// It doesn't matter where the AtomicFlag is built so long as it's always
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// Set() from the same sequence after. Note: the sequencing requirements are
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// necessary for IsSet()'s callers to know which sequence's memory operations
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// they are synchronized with.
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set_sequence_checker_.DetachFromSequence();
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}
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void AtomicFlag::Set() {
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DCHECK(set_sequence_checker_.CalledOnValidSequence());
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base::subtle::Release_Store(&flag_, 1);
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}
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bool AtomicFlag::IsSet() const {
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return base::subtle::Acquire_Load(&flag_) != 0;
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}
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void AtomicFlag::UnsafeResetForTesting() {
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base::subtle::Release_Store(&flag_, 0);
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}
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} // namespace base
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