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Code Issues Releases Activity

Synchronize the extra SA threading checks and return value handling of

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condition variables with that of msleep().

Reviewed by:	davidxu
This commit is contained in:
John Baldwin 2004-08-10 17:42:59 +00:00
parent ea84c8dc30
commit 274f8f48e8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=133440
1 changed files with 50 additions and 24 deletions
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74
sys/kern/kern_condvar.c
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@ -170,12 +170,28 @@ cv_wait_sig(struct cv *cvp, struct mtx *mp)
* procs or panic below, in case this is the idle process and
* already asleep.
*/
return 0;
return (0);
}
sq = sleepq_lookup(cvp);
/* XXX: Missing the threading checks from msleep! */
/*
* Don't bother sleeping if we are exiting and not the exiting
* thread or if our thread is marked as interrupted.
*/
mtx_lock_spin(&sched_lock);
if (p->p_flag & P_SA || p->p_numthreads > 1) {
if ((p->p_flag & P_SINGLE_EXIT) && p->p_singlethread != td)
rval = EINTR;
else if (td->td_flags & TDF_INTERRUPT)
rval = td->td_intrval;
if (rval != 0) {
mtx_unlock_spin(&sched_lock);
sleepq_release(cvp);
return (rval);
}
}
mtx_unlock_spin(&sched_lock);
cvp->cv_waiters++;
DROP_GIANT();
@ -183,20 +199,16 @@ cv_wait_sig(struct cv *cvp, struct mtx *mp)
sleepq_add(sq, cvp, mp, cvp->cv_description, SLEEPQ_CONDVAR);
sig = sleepq_catch_signals(cvp);
/*
* XXX: Missing magic return value handling for no signal
* caught but thread woken up during check.
*/
rval = sleepq_wait_sig(cvp);
if (sig == 0 && !TD_ON_SLEEPQ(td)) {
mtx_lock_spin(&sched_lock);
td->td_flags &= ~TDF_SINTR;
mtx_unlock_spin(&sched_lock);
sleepq_wait(cvp);
} else
rval = sleepq_wait_sig(cvp);
if (rval == 0)
rval = sleepq_calc_signal_retval(sig);
/* XXX: Part of missing threading checks? */
PROC_LOCK(p);
if (p->p_flag & P_WEXIT)
rval = EINTR;
PROC_UNLOCK(p);
#ifdef KTRACE
if (KTRPOINT(td, KTR_CSW))
ktrcsw(0, 0);
@ -303,6 +315,24 @@ cv_timedwait_sig(struct cv *cvp, struct mtx *mp, int timo)
sq = sleepq_lookup(cvp);
/*
* Don't bother sleeping if we are exiting and not the exiting
* thread or if our thread is marked as interrupted.
*/
mtx_lock_spin(&sched_lock);
if (p->p_flag & P_SA || p->p_numthreads > 1) {
if ((p->p_flag & P_SINGLE_EXIT) && p->p_singlethread != td)
rval = EINTR;
else if (td->td_flags & TDF_INTERRUPT)
rval = td->td_intrval;
if (rval != 0) {
mtx_unlock_spin(&sched_lock);
sleepq_release(cvp);
return (rval);
}
}
mtx_unlock_spin(&sched_lock);
cvp->cv_waiters++;
DROP_GIANT();
mtx_unlock(mp);
@ -310,20 +340,16 @@ cv_timedwait_sig(struct cv *cvp, struct mtx *mp, int timo)
sleepq_add(sq, cvp, mp, cvp->cv_description, SLEEPQ_CONDVAR);
sleepq_set_timeout(cvp, timo);
sig = sleepq_catch_signals(cvp);
/*
* XXX: Missing magic return value handling for no signal
* caught but thread woken up during check.
*/
rval = sleepq_timedwait_sig(cvp, sig != 0);
if (sig == 0 && !TD_ON_SLEEPQ(td)) {
mtx_lock_spin(&sched_lock);
td->td_flags &= ~TDF_SINTR;
mtx_unlock_spin(&sched_lock);
rval = sleepq_timedwait(cvp);
} else
rval = sleepq_timedwait_sig(cvp, sig != 0);
if (rval == 0)
rval = sleepq_calc_signal_retval(sig);
/* XXX: Part of missing threading checks? */
PROC_LOCK(p);
if (p->p_flag & P_WEXIT)
rval = EINTR;
PROC_UNLOCK(p);
#ifdef KTRACE
if (KTRPOINT(td, KTR_CSW))
ktrcsw(0, 0);