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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/platform/mutex.h"
#include "mongo/stdx/condition_variable.h"
namespace mongo {
namespace unittest {
/**
* Holds internal thread counter that is set on initialization.
* This counter is decremented every time a thread enters countDownAndWait() and blocks.
* All threads are unblocked when the counter reaches zero and the counter is reset.
*/
class Barrier {
Barrier(const Barrier&) = delete;
Barrier& operator=(const Barrier&) = delete;
public:
/**
* Initializes barrier with a default thread count.
*/
explicit Barrier(size_t threadCount);
/**
* Decrements thread counter by 1. If the thread counter is not zero, the thread blocks
* until the counter reaches zero.
*/
void countDownAndWait();
private:
size_t _threadCount;
size_t _threadsWaiting;
uint64_t _generation;
stdx::mutex _mutex; // NOLINT
stdx::condition_variable _condition;
};
} // namespace unittest
} // namespace mongo
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