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#include <sys/times.h>
#include <sys/time.h>
#include <metal/timer.h>
#include <errno.h>
extern int _gettimeofday(struct timeval *, void *);
/* Timing information for current process. From
newlib/libc/include/sys/times.h the tms struct fields are as follows:
- clock_t tms_utime : user clock ticks
- clock_t tms_stime : system clock ticks
- clock_t tms_cutime : children's user clock ticks
- clock_t tms_cstime : children's system clock ticks
Since maven does not currently support processes we set both of the
children's times to zero. Eventually we might want to separately
account for user vs system time, but for now we just return the total
number of cycles since starting the program. */
clock_t
_times(struct tms *buf)
{
int rv;
// when called for the first time, initialize t0
static struct timeval t0;
if (t0.tv_sec == 0 && t0.tv_usec == 0)
_gettimeofday (&t0, 0);
struct timeval t;
_gettimeofday (&t, 0);
unsigned long long timebase;
if (rv = metal_timer_get_timebase_frequency(0, &timebase)) {
return -1;
}
long long utime = (t.tv_sec - t0.tv_sec) * 1000000 + (t.tv_usec - t0.tv_usec);
buf->tms_utime = utime * timebase / 1000000;
buf->tms_stime = buf->tms_cstime = buf->tms_cutime = 0;
return 0;
}
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