[src/trunk]: src/sys/ddb deal with the proc_lock mutex.

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

details:   https://anonhg.NetBSD.org/src/rev/c3b332cf9132
branches:  trunk
changeset: 771756:c3b332cf9132
user:      christos <christos%NetBSD.org@localhost>
date:      Fri Dec 02 23:57:58 2011 +0000

description:
deal with the proc_lock mutex.

diffstat:

 sys/ddb/db_xxx.c |  9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diffs (31 lines):

diff -r e254897e21b5 -r c3b332cf9132 sys/ddb/db_xxx.c
--- a/sys/ddb/db_xxx.c  Fri Dec 02 22:28:47 2011 +0000
+++ b/sys/ddb/db_xxx.c  Fri Dec 02 23:57:58 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: db_xxx.c,v 1.64 2011/06/12 03:35:51 rmind Exp $        */
+/*     $NetBSD: db_xxx.c,v 1.65 2011/12/02 23:57:58 christos Exp $     */
 
 /*
  * Copyright (c) 1982, 1986, 1989, 1991, 1993
@@ -37,7 +37,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: db_xxx.c,v 1.64 2011/06/12 03:35:51 rmind Exp $");
+__KERNEL_RCSID(0, "$NetBSD: db_xxx.c,v 1.65 2011/12/02 23:57:58 christos Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_kgdb.h"
@@ -106,8 +106,11 @@
               db_error("?\n");
               /*NOTREACHED*/
        }
-
+       /* We might stop when the mutex is held or when not */
+       t = mutex_tryenter(proc_lock);
        p = proc_find((pid_t)pid);
+       if (t)
+               mutex_exit(proc_lock);
        if (p == NULL) {
               db_error("no such proc\n");
               /*NOTREACHED*/