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Avoid manipulating semu_list outside of the scope of SEMUNDO_LOCK(). This

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would lead to an occasional hang with a cycle in semu_list.

X-Discussed-On: hackers@
This commit is contained in:
Ed Maste 2007-03-26 17:41:14 +00:00
parent 7aa963e5e5
commit caa8943810
1 changed files with 5 additions and 2 deletions
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7
sys/kern/sysv_sem.c
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@ -1287,8 +1287,10 @@ semexit_myhook(arg, p)
*/
SEMUNDO_LOCK();
SLIST_FOREACH_PREVPTR(suptr, supptr, &semu_list, un_next) {
if (suptr->un_proc == p)
if (suptr->un_proc == p) {
*supptr = SLIST_NEXT(suptr, un_next);
break;
}
}
SEMUNDO_UNLOCK();
@ -1348,8 +1350,9 @@ semexit_myhook(arg, p)
* Deallocate the undo vector.
*/
DPRINTF(("removing vector\n"));
SEMUNDO_LOCK();
suptr->un_proc = NULL;
*supptr = SLIST_NEXT(suptr, un_next);
SEMUNDO_UNLOCK();
}
static int