[src/trunk]: src/tests/lib/libc/membar membar(3): Fix t_spinlock for machines...

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

details:   https://anonhg.NetBSD.org/src/rev/99e255b4673c
branches:  trunk
changeset: 368902:99e255b4673c
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Fri Aug 12 11:21:44 2022 +0000

description:
membar(3): Fix t_spinlock for machines with hash-locked atomics.

Regular stores don't participate in the hash-locking scheme, so use
atomic_swap instead of a regular store here.

diffstat:

 tests/lib/libc/membar/t_spinlock.c |  10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diffs (32 lines):

diff -r 93496857deaa -r 99e255b4673c tests/lib/libc/membar/t_spinlock.c
--- a/tests/lib/libc/membar/t_spinlock.c        Fri Aug 12 11:15:40 2022 +0000
+++ b/tests/lib/libc/membar/t_spinlock.c        Fri Aug 12 11:21:44 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_spinlock.c,v 1.3 2022/04/10 11:36:32 riastradh Exp $ */
+/*     $NetBSD: t_spinlock.c,v 1.4 2022/08/12 11:21:44 riastradh Exp $ */
 
 /*-
  * Copyright (c) 2022 The NetBSD Foundation, Inc.
@@ -27,7 +27,9 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_spinlock.c,v 1.3 2022/04/10 11:36:32 riastradh Exp $");
+__RCSID("$NetBSD: t_spinlock.c,v 1.4 2022/08/12 11:21:44 riastradh Exp $");
+
+#include <sys/types.h>
 
 #include <sys/atomic.h>
 #include <sys/param.h>
@@ -76,7 +78,11 @@
 {
 
        membar_release();
+#ifdef __HAVE_HASHLOCKED_ATOMICS
+       (void)atomic_cas_uint(&lockbit, 1, 0);
+#else
        lockbit = 0;
+#endif
 }
 
 static void *