/*
    Copyright (C) 2021 Carl Hetherington <cth@carlh.net>

    This file is part of DCP-o-matic.

    DCP-o-matic is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    DCP-o-matic 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.

*/


#include "barrier.h"


Barrier::Barrier (int count)
	: _count(count)
{

}


void
Barrier::wait ()
{
	boost::mutex::scoped_lock lm (_mutex);
	++_waiting;
	if (_waiting >= _count) {
		_condition.notify_all();
		_waiting = 0;
	} else {
		_condition.wait(lm);
	}
}


void
Barrier::lower ()
{
	boost::mutex::scoped_lock lm (_mutex);
	_count = 0;
	_condition.notify_all();
}