// 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/check_op.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. DETACH_FROM_SEQUENCE(set_sequence_checker_); } AtomicFlag::~AtomicFlag() = default; void AtomicFlag::Set() { DCHECK_CALLED_ON_VALID_SEQUENCE(set_sequence_checker_); flag_.store(1, std::memory_order_release); } void AtomicFlag::UnsafeResetForTesting() { DETACH_FROM_SEQUENCE(set_sequence_checker_); flag_.store(0, std::memory_order_release); } } // namespace base