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/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/unittest/barrier.h"
#include "mongo/util/assert_util.h"
namespace mongo {
namespace unittest {
Barrier::Barrier(size_t threadCount)
: _threadCount(threadCount),
_threadsWaiting(threadCount),
_generation(0) {
invariant(_threadCount > 0);
}
void Barrier::countDownAndWait() {
stdx::unique_lock<stdx::mutex> _lock(_mutex);
_threadsWaiting--;
if (_threadsWaiting == 0) {
_generation++;
_threadsWaiting = _threadCount;
_condition.notify_all();
}
else {
uint64_t currentGeneration = _generation;
while (currentGeneration == _generation) {
_condition.wait(_lock);
}
}
}
} // namespace unittest
} // namespace mongo
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