pulsar-client-cpp/lib/Latch.h

/**
 * 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 <boost/shared_ptr.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/condition_variable.hpp>

#pragma GCC visibility push(default)

namespace pulsar {

class Latch {
 public:
    Latch(int count);

    void countdown();

    void wait();

    bool wait(const boost::posix_time::time_duration& timeout);

    int getCount();

 private:
    struct InternalState {
        boost::mutex mutex;
        boost::condition_variable condition;
        int count;
    };

    typedef boost::unique_lock<boost::mutex> Lock;
    boost::shared_ptr<InternalState> state_;
};
typedef boost::shared_ptr<Latch> LatchPtr;
} /* namespace pulsar */

#pragma GCC visibility pop

#endif /* LIB_LATCH_H_ */