CVS commit: src/sys/kern

[YAMAMOTO Takashi <yamt%netbsd.org@localhost>]

Module Name:    src
Committed By:   yamt
Date:           Wed Aug  4 10:37:08 UTC 2004

Modified Files:
        src/sys/kern: kern_lock.c

Log Message:
add missing wakeups in the cases of lock failure.
from Stephan Uphoff, FreeBSD PR/69964.

(http://www.freebsd.org/cgi/query-pr.cgi?pr=69964)
> The LK_WANT_EXCL and LK_WANT_UPGRADE bits act as mini-locks and can block
> other threads.
> Normally this is not a problem since the mini locks are upgraded to full loc
> and the release of the locks will unblock the other threads.
> However if a thread reset the bits without optaining a full lock
> other threads are not awoken.
> This can happens if obtaining the full lock fails because of a LK_SLEEPFAIL,
> or a signal (if lock priority includes PCATCH .. don't think this is used).


To generate a diff of this commit:
cvs rdiff -r1.82 -r1.83 src/sys/kern/kern_lock.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.