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// 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.
// bthread - A M:N threading library to make applications more concurrent.
// Date: 2016/06/03 13:06:40
#ifndef BTHREAD_COUNTDOWN_EVENT_H
#define BTHREAD_COUNTDOWN_EVENT_H
#include "bthread/bthread.h"
namespace bthread {
// A synchronization primitive to wait for multiple signallers.
class CountdownEvent {
public:
CountdownEvent(int initial_count = 1);
~CountdownEvent();
// Increase current counter by |v|
void add_count(int v = 1);
// Reset the counter to |v|
void reset(int v = 1);
// Decrease the counter by |sig|
void signal(int sig = 1);
// Block current thread until the counter reaches 0.
// Returns 0 on success, error code otherwise.
// This method never returns EINTR.
int wait();
// Block the current thread until the counter reaches 0 or duetime has expired
// Returns 0 on success, error code otherwise. ETIMEDOUT is for timeout.
// This method never returns EINTR.
int timed_wait(const timespec& duetime);
private:
int *_butex;
bool _wait_was_invoked;
};
} // namespace bthread
#endif // BTHREAD_COUNTDOWN_EVENT_H