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- /*
- * Copyright 2016-present Facebook, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #pragma once
- #include <atomic>
- #include <folly/portability/Asm.h>
- namespace folly {
- enum class AMBFlags {
- NORMAL,
- EXPEDITED,
- };
- FOLLY_ALWAYS_INLINE void asymmetricLightBarrier() {
- if (kIsLinux) {
- asm_volatile_memory();
- } else {
- std::atomic_thread_fence(std::memory_order_seq_cst);
- }
- }
- void asymmetricHeavyBarrier(AMBFlags flags = AMBFlags::EXPEDITED);
- } // namespace folly
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