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Fix race condition that caused activation of an event to

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be ignored immediately after it was deactivated.

Found by: 	Yahoo!
MFC after:	3 days
This commit is contained in:
Stephan Uphoff 2005-09-15 21:10:12 +00:00
parent 21f9e816cd
commit 19b2dff7b0
1 changed files with 4 additions and 2 deletions
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6
sys/kern/kern_event.c
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@ -1242,11 +1242,11 @@ kqueue_scan(struct kqueue *kq, int maxevents, struct kevent_copyops *k_ops,
KQ_GLOBAL_LOCK(&kq_global, haskqglobal);
KN_LIST_LOCK(kn);
if (kn->kn_fop->f_event(kn, 0) == 0) {
KN_LIST_UNLOCK(kn);
KQ_LOCK(kq);
kn->kn_status &=
~(KN_QUEUED | KN_ACTIVE | KN_INFLUX);
kq->kq_count--;
KN_LIST_UNLOCK(kn);
continue;
}
*kevp = kn->kn_kevent;
@ -1258,8 +1258,10 @@ kqueue_scan(struct kqueue *kq, int maxevents, struct kevent_copyops *k_ops,
kq->kq_count--;
} else
TAILQ_INSERT_TAIL(&kq->kq_head, kn, kn_tqe);
KN_LIST_UNLOCK(kn);
kn->kn_status &= ~(KN_INFLUX);
KN_LIST_UNLOCK(kn);
}
/* we are returning a copy to the user */