[src/trunk]: src/sys/kern futex(9): Convert membar_enter/exit to membar_acqui...

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

details:   https://anonhg.NetBSD.org/src/rev/1c456eed4846
branches:  trunk
changeset: 365727:1c456eed4846
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Thu Apr 21 12:05:13 2022 +0000

description:
futex(9): Convert membar_enter/exit to membar_acquire/release.

No functional change -- this is just in an illustrative comment!

diffstat:

 sys/kern/sys_futex.c |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (34 lines):

diff -r 819f99ace019 -r 1c456eed4846 sys/kern/sys_futex.c
--- a/sys/kern/sys_futex.c      Thu Apr 21 07:03:44 2022 +0000
+++ b/sys/kern/sys_futex.c      Thu Apr 21 12:05:13 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: sys_futex.c,v 1.17 2022/04/09 23:38:33 riastradh Exp $ */
+/*     $NetBSD: sys_futex.c,v 1.18 2022/04/21 12:05:13 riastradh Exp $ */
 
 /*-
  * Copyright (c) 2018, 2019, 2020 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sys_futex.c,v 1.17 2022/04/09 23:38:33 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sys_futex.c,v 1.18 2022/04/21 12:05:13 riastradh Exp $");
 
 /*
  * Futexes
@@ -63,13 +63,13 @@
  *                             continue;
  *                     }
  *             } while (atomic_cas_uint(&lock, v, v & ~1) != v);
- *             membar_enter();
+ *             membar_acquire();
  *
  *             ...
  *
  *             // Release the lock.  Optimistically assume there are
  *             // no waiters first until demonstrated otherwise.
- *             membar_exit();
+ *             membar_release();
  *             if (atomic_cas_uint(&lock, 1, 0) != 1) {
  *                     // There may be waiters.
  *                     v = atomic_swap_uint(&lock, 0);