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Optimize thr_suspend, if timeout is zero, don't call msleep, just

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return immediately.
This commit is contained in:
David Xu 2010-08-24 07:29:55 +00:00
parent baf28b69f4
commit 2961a78226
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=211733
1 changed files with 14 additions and 9 deletions
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23
sys/kern/kern_thr.c
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@ -430,15 +430,12 @@ int
kern_thr_suspend(struct thread *td, struct timespec *tsp)
{
struct timeval tv;
int error = 0, hz = 0;
int error = 0;
int timo = 0;
if (tsp != NULL) {
if (tsp->tv_nsec < 0 || tsp->tv_nsec > 1000000000)
return (EINVAL);
if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
return (ETIMEDOUT);
TIMESPEC_TO_TIMEVAL(&tv, tsp);
hz = tvtohz(&tv);
}
if (td->td_pflags & TDP_WAKEUP) {
@ -447,9 +444,17 @@ kern_thr_suspend(struct thread *td, struct timespec *tsp)
}
PROC_LOCK(td->td_proc);
if ((td->td_flags & TDF_THRWAKEUP) == 0)
error = msleep((void *)td, &td->td_proc->p_mtx, PCATCH, "lthr",
hz);
if ((td->td_flags & TDF_THRWAKEUP) == 0) {
if (tsp->tv_sec == 0 && tsp->tv_nsec == 0)
error = EWOULDBLOCK;
else {
TIMESPEC_TO_TIMEVAL(&tv, tsp);
timo = tvtohz(&tv);
error = msleep((void *)td, &td->td_proc->p_mtx,
PCATCH, "lthr", timo);
}
}
if (td->td_flags & TDF_THRWAKEUP) {
thread_lock(td);
td->td_flags &= ~TDF_THRWAKEUP;
@ -461,7 +466,7 @@ kern_thr_suspend(struct thread *td, struct timespec *tsp)
if (error == EWOULDBLOCK)
error = ETIMEDOUT;
else if (error == ERESTART) {
if (hz != 0)
if (timo != 0)
error = EINTR;
}
return (error);