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Implement CLOCK_VIRTUAL and CLOCK_PROF for clock_gettime(2) and

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clock_getres(2).

Reviewed by:	phk
PR:		23304
This commit is contained in:
Kelly Yancey 2004-06-17 23:12:12 +00:00
parent 9535efc00d
commit b8817154c3
1 changed files with 39 additions and 9 deletions
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48
sys/kern/kern_time.c
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@ -156,13 +156,31 @@ int
clock_gettime(struct thread *td, struct clock_gettime_args *uap)
{
struct timespec ats;
struct timeval user, sys;
if (uap->clock_id == CLOCK_REALTIME)
switch (uap->clock_id) {
case CLOCK_REALTIME:
nanotime(&ats);
else if (uap->clock_id == CLOCK_MONOTONIC)
break;
case CLOCK_MONOTONIC:
nanouptime(&ats);
else
break;
case CLOCK_VIRTUAL:
calcru(td->td_proc, &user, &sys, NULL);
TIMEVAL_TO_TIMESPEC(&user, &ats);
break;
case CLOCK_PROF:
calcru(td->td_proc, &user, &sys, NULL);
ats.tv_sec = user.tv_sec + sys.tv_sec;
ats.tv_nsec = (user.tv_usec + sys.tv_usec) * 1000;
if (ats.tv_nsec > 1000000000) {
ats.tv_sec++;
ats.tv_nsec -= 1000000000;
}
break;
default:
return (EINVAL);
}
return (copyout(&ats, uap->tp, sizeof(ats)));
}
@ -216,19 +234,31 @@ clock_getres(struct thread *td, struct clock_getres_args *uap)
struct timespec ts;
int error;
if (uap->clock_id != CLOCK_REALTIME)
return (EINVAL);
error = 0;
if (uap->tp) {
ts.tv_sec = 0;
ts.tv_sec = 0;
switch (uap->clock_id) {
case CLOCK_REALTIME:
case CLOCK_MONOTONIC:
/*
* Round up the result of the division cheaply by adding 1.
* Rounding up is especially important if rounding down
* would give 0. Perfect rounding is unimportant.
*/
ts.tv_nsec = 1000000000 / tc_getfrequency() + 1;
error = copyout(&ts, uap->tp, sizeof(ts));
break;
case CLOCK_VIRTUAL:
case CLOCK_PROF:
/* Accurately round up here because we can do so cheaply. */
ts.tv_nsec = (1000000000 + hz - 1) / hz;
break;
default:
return (EINVAL);
}
error = 0;
if (uap->tp)
error = copyout(&ts, uap->tp, sizeof(ts));
return (error);
}