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Code Issues Releases Activity

- transferlockers() requires the interlock to be SMP safe.

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Sponsored by:	Isilon Systems, Inc.
This commit is contained in:
Jeff Roberson 2005-03-15 09:27:45 +00:00
parent e9f2afc1b8
commit f5f0da0a0e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=143621
1 changed files with 8 additions and 2 deletions
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10
sys/kern/kern_lock.c
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@ -517,14 +517,20 @@ transferlockers(from, to)
KASSERT(from != to, ("lock transfer to self"));
KASSERT((from->lk_flags&LK_WAITDRAIN) == 0, ("transfer draining lock"));
if (from->lk_waitcount == 0)
mtx_lock(from->lk_interlock);
if (from->lk_waitcount == 0) {
mtx_unlock(from->lk_interlock);
return;
}
from->lk_newlock = to;
wakeup((void *)from);
msleep(&from->lk_newlock, NULL, from->lk_prio, "lkxfer", 0);
msleep(&from->lk_newlock, from->lk_interlock, from->lk_prio,
"lkxfer", 0);
from->lk_newlock = NULL;
from->lk_flags &= ~(LK_WANT_EXCL | LK_WANT_UPGRADE);
KASSERT(from->lk_waitcount == 0, ("active lock"));
mtx_unlock(from->lk_interlock);
}