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.
23 * This must be called at least once from any thread, which uses RCUReadLock.
24 * First call should happen before RCUReadLock is used for the first time. Can
25 * be safely called more that once.
27 * Returns true when called for the first time from current thread.
29 bool RCURegisterThread();
33 static RCUReadLock& instance() {
34 // Both lock and unlock are static, so no need to worry about destruction
36 static RCUReadLock instance;
41 assert(RCURegisterThread() == false);
45 static void unlock() {