2 * Copyright 2016 Facebook, Inc.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 #include <folly/experimental/RCUUtils.h>
18 #include <folly/Portability.h>
19 #include <folly/ThreadLocal.h>
26 struct RCURegisterThreadHelper {
27 RCURegisterThreadHelper() {
28 rcu_register_thread();
31 ~RCURegisterThreadHelper() {
32 rcu_unregister_thread();
40 bool RCURegisterThread() {
41 static folly::ThreadLocal<RCURegisterThreadHelper>* rcuRegisterThreadHelper =
42 new folly::ThreadLocal<RCURegisterThreadHelper>();
44 auto& helper = **rcuRegisterThreadHelper;
46 auto ret = !helper.alive;
52 RCUReadLock& RCUReadLock::instance() {
53 // Both lock and unlock are static, so no need to worry about destruction
55 static RCUReadLock instance;