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Proc locking.

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jhb 2001-02-09 16:27:41 +00:00
parent 6e847a265b
commit cba738d96f
1 changed files with 10 additions and 14 deletions
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24
sys/kern/kern_lock.c
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@ -224,7 +224,7 @@ debuglockmgr(lkp, flags, interlkp, p, name, file, line)
{
int error;
pid_t pid;
int extflags;
int extflags, lockflags;
CTR5(KTR_LOCKMGR,
"lockmgr(): lkp == %p (lk_wmesg == \"%s\"), flags == 0x%x, "
@ -255,20 +255,16 @@ debuglockmgr(lkp, flags, interlkp, p, name, file, line)
* lock itself ).
*/
if (lkp->lk_lockholder != pid) {
if (p && (p->p_flag & P_DEADLKTREAT)) {
error = acquire(
lkp,
extflags,
LK_HAVE_EXCL
);
} else {
error = acquire(
lkp,
extflags,
LK_HAVE_EXCL | LK_WANT_EXCL |
LK_WANT_UPGRADE
);
lockflags = LK_HAVE_EXCL;
if (p) {
PROC_LOCK(p);
if (!p->p_flag & P_DEADLKTREAT) {
lockflags |= LK_WANT_EXCL |
LK_WANT_UPGRADE;
}
PROC_UNLOCK(p);
}
error = acquire(lkp, extflags, lockflags);
if (error)
break;
sharelock(lkp, 1);