/* * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009 * The President and Fellows of Harvard College. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <types.h> #include <clock.h> /* * ts1 + ts2 */ void timespec_add(const struct timespec *ts1, const struct timespec *ts2, struct timespec *ret) { ret->tv_nsec = ts1->tv_nsec + ts2->tv_nsec; ret->tv_sec = ts1->tv_sec + ts2->tv_sec; if (ret->tv_nsec >= 1000000000) { ret->tv_nsec -= 1000000000; ret->tv_sec += 1; } } /* * ts1 - ts2 */ void timespec_sub(const struct timespec *ts1, const struct timespec *ts2, struct timespec *ret) { /* in case ret and ts1 or ts2 are the same */ struct timespec r; r = *ts1; if (r.tv_nsec < ts2->tv_nsec) { r.tv_nsec += 1000000000; r.tv_sec--; } r.tv_nsec -= ts2->tv_nsec; r.tv_sec -= ts2->tv_sec; *ret = r; }