- Implement selwakeuppri() which allows raising the priority of a

  thread being waken up.  The thread waken up can run at a priority as
  high as after tsleep().

- Replace selwakeup()s with selwakeuppri()s and pass appropriate
  priorities.

- Add cv_broadcastpri() which raises the priority of the broadcast
  threads.  Used by selwakeuppri() if collision occurs.

Not objected in:	-arch, -current

1 files changed, 2 insertions, 2 deletions

diff --git a/sys/dev/snp/snp.c b/sys/dev/snp/snp.c
index d08ff3f..4c4115d 100644
--- a/sys/dev/snp/snp.c
+++ b/sys/dev/snp/snp.c
@@ -370,7 +370,7 @@ snp_in(snp, buf, n)
 		snp->snp_flags &= ~SNOOP_RWAIT;
 		wakeup(snp);
 	}
-	selwakeup(&snp->snp_sel);
+	selwakeuppri(&snp->snp_sel, PZERO + 1);
 
 	return (n);
 }
@@ -444,7 +444,7 @@ snp_detach(snp)
 	snp->snp_target = NODEV;
 
 detach_notty:
-	selwakeup(&snp->snp_sel);
+	selwakeuppri(&snp->snp_sel, PZERO + 1);
 	if ((snp->snp_flags & SNOOP_OPEN) == 0) 
 		free(snp, M_SNP);