154 lines
3.0 KiB
C++
154 lines
3.0 KiB
C++
// ------------------------------------------------------------------------
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// kvu_timestamp.cpp: Monotonic timestamps
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// Copyright (C) 2009 Kai Vehmanen
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//
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// Attributes:
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// eca-style-version: 3
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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// ------------------------------------------------------------------------
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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/* note: code assumes timespect struct to be defined in
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* time.h (i.e. SUSv2 or later) */
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#include <time.h>
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#include <kvu_timestamp.h>
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#if HAVE_CLOCK_GETTIME
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/* IMPLEMENTATION: clock_gettime() */
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/* *********************************/
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int kvu_clock_is_monotonic(void)
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{
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int res = -1;
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#if defined CLOCK_MONOTONIC
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struct timespec tp;
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res = clock_getres(CLOCK_MONOTONIC, &tp);
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#endif
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if (res == 0)
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return 1;
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return 0;
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}
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int kvu_clock_getres(struct timespec *dst)
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{
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struct timespec tp;
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int res = -1;
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#if defined CLOCK_MONOTONIC
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res = clock_getres(CLOCK_MONOTONIC, &tp);
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#endif
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if (res < 0)
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res =
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clock_getres(CLOCK_REALTIME, &tp);
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if (res == 0) {
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dst->tv_sec = tp.tv_sec;
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dst->tv_sec = tp.tv_nsec;
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}
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return res;
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}
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int kvu_clock_gettime(struct timespec *dst)
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{
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struct timespec tp;
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int res = -1;
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#if defined CLOCK_MONOTONIC
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res = clock_gettime(CLOCK_MONOTONIC, &tp);
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#endif
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if (res < 0)
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res =
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clock_gettime(CLOCK_REALTIME, &tp);
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if (res == 0) {
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dst->tv_sec = tp.tv_sec;
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dst->tv_nsec = tp.tv_nsec;
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}
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return res;
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}
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#elif HAVE_GETTIMEOFDAY
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/* IMPLEMENTATION: gettimeofday() */
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/* ********************************/
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int kvu_clock_is_monotonic(void)
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{
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return 0;
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}
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int kvu_clock_getres(struct timespec *arg)
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{
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/* note: an estimate, actual resolution may
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* be worse */
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arg->tv_sec = 0;
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arg->tv_nsec = 1000;
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return 0;
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}
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int kvu_clock_gettime(struct timespec *arg)
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{
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struct timeval tmp;
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int res =
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gettimeofday(&tmp, NULL);
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if (res == 0) {
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arg->tv_sec = tmp.tv_sec;
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arg->tv_nsec = tmp.tv_usec * 1000;
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}
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return res;
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}
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#else
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/* IMPLEMENTATION: fallback / no-op */
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/* **********************************/
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int kvu_clock_is_monotonic(void)
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{
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DBC_NEVER_REACHED();
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return 0;
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}
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int kvu_clock_getres(struct timespec *res)
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{
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DBC_NEVER_REACHED();
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return -1;
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}
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int kvu_clock_gettime(struct timespec *tp)
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{
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DBC_NEVER_REACHED();
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return -1;
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}
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#endif
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