43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <thread>
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#include <folly/portability/Asm.h>
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// Some utilities used by AtomicHashArray and AtomicHashMap
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//
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namespace folly {
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namespace detail {
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template <typename Cond>
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void atomic_hash_spin_wait(Cond condition) {
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constexpr size_t kPauseLimit = 10000;
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for (size_t i = 0; condition(); ++i) {
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if (i < kPauseLimit) {
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folly::asm_volatile_pause();
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} else {
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std::this_thread::yield();
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}
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}
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}
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} // namespace detail
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} // namespace folly
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