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/********************* */
/*! \file clock_gettime.c
** \verbatim
** Original author: mdeters
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009-2012 New York University and The University of Iowa
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Replacement for clock_gettime() for systems without it (like
** Mac OS X)
**
** Replacement for clock_gettime() for systems without it (like Mac
** OS X).
**/
#include "cvc4_private.h"
#include "lib/clock_gettime.h"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#if !(defined(__APPLE__) || defined(__WIN32__))
# warning "This code assumes you're on Mac OS X or Win32, and you don't seem to be. You'll likely have problems."
#endif /* !(__APPLE__ || __WIN32__) */
#ifdef __APPLE__
#include <stdio.h>
#include <errno.h>
#include <mach/mach_time.h>
static double s_clockconv = 0.0;
long clock_gettime(clockid_t which_clock, struct timespec* tp) {
if( s_clockconv == 0.0 ) {
mach_timebase_info_data_t tb;
kern_return_t err = mach_timebase_info(&tb);
if(err == 0) {
s_clockconv = ((double) tb.numer) / tb.denom;
} else {
return -EINVAL;
}
}
switch(which_clock) {
case CLOCK_REALTIME:
case CLOCK_REALTIME_HR:
case CLOCK_MONOTONIC:
case CLOCK_MONOTONIC_HR: {
uint64_t t = mach_absolute_time() * s_clockconv;
tp->tv_sec = t / 1000000000ul;
tp->tv_nsec = t % 1000000000ul;
}
break;
default:
return -EINVAL;
}
return 0;
}
#else /* else we're __WIN32__ */
#include <time.h>
#include <windows.h>
long clock_gettime(clockid_t which_clock, struct timespec* tp) {
if(tp != NULL) {
FILETIME ft;
GetSystemTimeAsFileTime(&ft);
uint64_t nanos = ((((uint64_t)ft.dwHighDateTime) << 32) | ft.dwLowDateTime) * 100;
tp->tv_sec = nanos / 1000000000ul;
tp->tv_nsec = nanos % 1000000000ul;
}
return 0;
}
#endif /* __APPLE__ / __WIN32__ */
#ifdef __cplusplus
}/* extern "C" */
#endif /* __cplusplus */
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