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| author | jmg <jmg@FreeBSD.org> | 2004-08-15 06:24:42 +0000 |
|---|---|---|
| committer | jmg <jmg@FreeBSD.org> | 2004-08-15 06:24:42 +0000 |
| commit | bc1805c6e871c178d0b6516c3baa774ffd77224a (patch) | |
| tree | 1172b68a7c9e7fa73090ae134eb98825bdab8ad6 /sys/kern/tty_cons.c | |
| parent | 57da12d01618c3ef2590eab07e71f69d16ead13a (diff) | |
| download | FreeBSD-src-bc1805c6e871c178d0b6516c3baa774ffd77224a.zip FreeBSD-src-bc1805c6e871c178d0b6516c3baa774ffd77224a.tar.gz | |
Add locking to the kqueue subsystem. This also makes the kqueue subsystem
a more complete subsystem, and removes the knowlege of how things are
implemented from the drivers. Include locking around filter ops, so a
module like aio will know when not to be unloaded if there are outstanding
knotes using it's filter ops.
Currently, it uses the MTX_DUPOK even though it is not always safe to
aquire duplicate locks. Witness currently doesn't support the ability
to discover if a dup lock is ok (in some cases).
Reviewed by: green, rwatson (both earlier versions)
Diffstat (limited to 'sys/kern/tty_cons.c')
| -rw-r--r-- | sys/kern/tty_cons.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/kern/tty_cons.c b/sys/kern/tty_cons.c index 54a287c..dd8a115 100644 --- a/sys/kern/tty_cons.c +++ b/sys/kern/tty_cons.c @@ -528,11 +528,11 @@ cnkqfilter(struct cdev *dev, struct knote *kn) cnd = STAILQ_FIRST(&cn_devlist); if (cn_mute || CND_INVALID(cnd, curthread)) - return (1); + return (EINVAL); dev = cnd->cnd_vp->v_rdev; if (dev != NULL) return ((*devsw(dev)->d_kqfilter)(dev, kn)); - return (1); + return (ENXIO); } /* |
