1/*
2 * Copyright 2012-present Facebook, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#pragma once
18
19#include <thread>
20
21#include <folly/portability/Asm.h>
22
23// Some utilities used by AtomicHashArray and AtomicHashMap
24//
25
26namespace folly {
27namespace detail {
28
29template <typename Cond>
30void atomic_hash_spin_wait(Cond condition) {
31 constexpr size_t kPauseLimit = 10000;
32 for (size_t i = 0; condition(); ++i) {
33 if (i < kPauseLimit) {
34 folly::asm_volatile_pause();
35 } else {
36 std::this_thread::yield();
37 }
38 }
39}
40
41} // namespace detail
42} // namespace folly
43