| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| #ifndef LIB_LATCH_H_ |
| #define LIB_LATCH_H_ |
| |
| #include <memory> |
| #include <mutex> |
| #include <condition_variable> |
| #include <pulsar/defines.h> |
| |
| namespace pulsar { |
| |
| class PULSAR_PUBLIC Latch { |
| public: |
| Latch(int count); |
| |
| void countdown(); |
| |
| void wait(); |
| |
| template <typename Duration> |
| bool wait(const Duration& timeout) { |
| Lock lock(state_->mutex); |
| return state_->condition.wait_for(lock, timeout, CountIsZero(state_->count)); |
| } |
| |
| int getCount(); |
| |
| private: |
| struct InternalState { |
| std::mutex mutex; |
| std::condition_variable condition; |
| int count; |
| }; |
| |
| struct CountIsZero { |
| const int& count_; |
| |
| CountIsZero(const int& count) : count_(count) {} |
| |
| bool operator()() const { return count_ == 0; } |
| }; |
| |
| typedef std::unique_lock<std::mutex> Lock; |
| std::shared_ptr<InternalState> state_; |
| }; |
| typedef std::shared_ptr<Latch> LatchPtr; |
| } /* namespace pulsar */ |
| |
| #endif /* LIB_LATCH_H_ */ |