[src/trunk]: src/lib/libpthread Adjustment to previous: don't call _lwp_unpar...

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

details:   https://anonhg.NetBSD.org/src/rev/81b89b82f414
branches:  trunk
changeset: 744148:81b89b82f414
user:      ad <ad%NetBSD.org@localhost>
date:      Sat Jan 25 18:30:41 2020 +0000

description:
Adjustment to previous: don't call _lwp_unpark_all() with nwaiters == 0.

diffstat:

 lib/libpthread/pthread_mutex.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 3ec3b8660854 -r 81b89b82f414 lib/libpthread/pthread_mutex.c
--- a/lib/libpthread/pthread_mutex.c    Sat Jan 25 18:21:37 2020 +0000
+++ b/lib/libpthread/pthread_mutex.c    Sat Jan 25 18:30:41 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pthread_mutex.c,v 1.67 2020/01/25 17:58:28 ad Exp $    */
+/*     $NetBSD: pthread_mutex.c,v 1.68 2020/01/25 18:30:41 ad Exp $    */
 
 /*-
  * Copyright (c) 2001, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -47,7 +47,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: pthread_mutex.c,v 1.67 2020/01/25 17:58:28 ad Exp $");
+__RCSID("$NetBSD: pthread_mutex.c,v 1.68 2020/01/25 18:30:41 ad Exp $");
 
 #include <sys/types.h>
 #include <sys/lwpctl.h>
@@ -529,7 +529,7 @@
                        (void)_lwp_unpark(self->pt_waiters[0],
                            __UNVOLATILE(&ptm->ptm_waiters));
                }
-       } else {
+       } else if (self->pt_nwaiters > 0) {
                (void)_lwp_unpark_all(self->pt_waiters, self->pt_nwaiters,
                    __UNVOLATILE(&ptm->ptm_waiters));
        }