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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* See LICENSE.txt included in this distribution for the specific
* language governing permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at LICENSE.txt.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Provide gethrtime() for systems that don't have it natively.
*/
#include "config.h"
#ifndef HAVE_GETHRTIME
#include <sys/time.h>
#include <time.h>
#include <stdio.h>
/* Mac OS X implementation using mach_time.h */
#if defined(HAVE_MACH_MACH_TIME_H)
#include <mach/mach_time.h>
hrtime_t gethrtime() {
static mach_timebase_info_data_t info = {0,0};
/* Initialize once */
if (info.denom == 0) {
mach_timebase_info(&info);
}
return mach_absolute_time() * info.numer / info.denom;
}
/* Implementation using clock_gettime() with CLOCK_MONOTONIC */
#elif defined(HAVE_CLOCK_GETTIME)
hrtime_t gethrtime() {
hrtime_t ret;
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1) {
perror("clock_gettime");
return (-1ULL);
}
ret = ts.tv_sec * 1000000000;
ret += ts.tv_nsec;
return ret;
}
#else
/* Unreliable fallback implementation using gettimeofday() */
hrtime_t gethrtime() {
hrtime_t ret;
struct timeval tv;
if (gettimeofday(&tv, NULL) == -1) {
perror("gettimeofday");
return (-1ULL);
}
ret = (hrtime_t)tv.tv_sec * 1000000000;
ret += tv.tv_usec * 1000;
return ret;
}
#endif /* #if defined(HAVE_MACH_MACH_TIME_H) */
#endif /* #ifndef HAVE_GETHRTIME */
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