scsh-0.5/scsh/linux/time_dep1.c

39 lines
1.0 KiB
C

/* OS-dependent support for fine-grained timer.
** Copyright (c) 1995 by Olin Shivers.
**
** We return the current time in seconds and sub-second "ticks" where the
** number of ticks/second is OS dependent (and is defined in time_dep.scm).
** This definition works on any BSD Unix with the gettimeofday()
** microsecond-resolution timer.
*/
#include <errno.h>
#include <sys/time.h>
#include "scheme48.h"
#include "../time1.h"
/* Sux because it's dependent on 32-bitness. */
#define hi8(i) (((i)>>24) & 0xff)
#define lo24(i) ((i) & 0xffffff)
#define comp8_24(hi, lo) (((hi)<<24) + (lo))
scheme_value time_plus_ticks(int *hi_secs, int *lo_secs,
int *hi_ticks, int *lo_ticks)
{
struct timeval t;
struct timezone tz;
if( gettimeofday(&t, &tz) ) return ENTER_FIXNUM(errno);
{ long int secs = t.tv_sec;
long int ticks = t.tv_usec;
*hi_secs = hi8(secs);
*lo_secs = lo24(secs);
*hi_ticks = hi8(ticks);
*lo_ticks = lo24(ticks);
}
return SCHFALSE;
}