/* Copyright 2012, Sebastian Reichel <sre@ring0.de>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

public struct Timer {
	private Posix.timespec time_old;

	public void start() {
		Posix.clock_gettime(Posix.CLOCK_MONOTONIC, out time_old);
	}

	public ulong ellapsed() {
		ulong result;
		Posix.timespec time_new;

		Posix.clock_gettime(Posix.CLOCK_MONOTONIC, out time_new);

		if(time_new.tv_sec < time_old.tv_sec)
			result = 0;
		else if(time_new.tv_sec == time_old.tv_sec)
			result = (time_new.tv_nsec - time_old.tv_nsec) / 1000;
		else
			result = (time_new.tv_sec - time_old.tv_sec) * 1000 - (time_old.tv_nsec/1000) + (time_new.tv_nsec/1000);

		time_old = time_new;
		return result;
	}
}