lib/Latch.cc

/**
 * 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.
 */
#include "Latch.h"

namespace pulsar {

Latch::Latch(int count) : state_(std::make_shared<InternalState>()) { state_->count = count; }

void Latch::countdown() {
    Lock lock(state_->mutex);

    state_->count--;

    if (state_->count == 0) {
        state_->condition.notify_all();
    }
}

int Latch::getCount() {
    Lock lock(state_->mutex);

    return state_->count;
}

void Latch::wait() {
    Lock lock(state_->mutex);

    state_->condition.wait(lock, CountIsZero(state_->count));
}

} /* namespace pulsar */