[src/trunk]: src/sys/rump/librump/rumpkern add comment about prospective peri...

[pooka <pooka%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/9ec50e5784c9
branches:  trunk
changeset: 750209:9ec50e5784c9
user:      pooka <pooka%NetBSD.org@localhost>
date:      Sun Dec 20 13:56:36 2009 +0000

description:
add comment about prospective perils to previous

diffstat:

 sys/rump/librump/rumpkern/ltsleep.c |  10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diffs (35 lines):

diff -r 992a7055743e -r 9ec50e5784c9 sys/rump/librump/rumpkern/ltsleep.c
--- a/sys/rump/librump/rumpkern/ltsleep.c       Sun Dec 20 13:49:36 2009 +0000
+++ b/sys/rump/librump/rumpkern/ltsleep.c       Sun Dec 20 13:56:36 2009 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ltsleep.c,v 1.24 2009/12/20 13:49:36 pooka Exp $       */
+/*     $NetBSD: ltsleep.c,v 1.25 2009/12/20 13:56:36 pooka Exp $       */
 
 /*
  * Copyright (c) 2007 Antti Kantee.  All Rights Reserved.
@@ -35,7 +35,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ltsleep.c,v 1.24 2009/12/20 13:49:36 pooka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ltsleep.c,v 1.25 2009/12/20 13:56:36 pooka Exp $");
 
 #include <sys/param.h>
 #include <sys/kernel.h>
@@ -66,10 +66,16 @@
 
        /* protected by biglock */
        if (timo) {
+               /*
+                * Calculate wakeup-time.
+                * XXX: should assert nanotime() does not block,
+                * i.e. yield the cpu and/or biglock.
+                */
                ticks.tv_sec = timo / hz;
                ticks.tv_nsec = (timo % hz) * (1000000000/hz);
                nanotime(&ts);
                timespecadd(&ts, &ticks, &ts);
+
                if (rumpuser_cv_timedwait(ltsp->cv, rump_giantlock,
                    ts.tv_sec, ts.tv_nsec) == 0)
                        rv = 0;