diff options
| author | Artur Grabowski <art@cvs.openbsd.org> | 2007-05-25 20:48:34 +0000 |
|---|---|---|
| committer | Artur Grabowski <art@cvs.openbsd.org> | 2007-05-25 20:48:34 +0000 |
| commit | f317bc290c14036a44fa5bd89e108b886c5cca9c (patch) | |
| tree | 993db71979e0e68aae9c4e1a59e60b378b997a2a /sys | |
| parent | 0e4c5975b636d3696b08d94d38e766e642a96f3a (diff) | |
Define rw_cas. Trivially simple on amd64 with atomic_cas_ul.
miod@ ok
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/arch/amd64/include/lock.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/arch/amd64/include/lock.h b/sys/arch/amd64/include/lock.h index 35b1974f910..57674ae58f7 100644 --- a/sys/arch/amd64/include/lock.h +++ b/sys/arch/amd64/include/lock.h @@ -1,4 +1,4 @@ -/* $OpenBSD: lock.h,v 1.1 2004/06/25 11:03:28 art Exp $ */ +/* $OpenBSD: lock.h,v 1.2 2007/05/25 20:48:33 art Exp $ */ /* $NetBSD: lock.h,v 1.1.2.2 2000/05/03 14:40:55 sommerfeld Exp $ */ /*- @@ -114,6 +114,8 @@ __cpu_simple_unlock(__cpu_simple_lock_t *lockp) *lockp = __SIMPLELOCK_UNLOCKED; } +#define rw_cas(p, o, n) (x86_atomic_cas_ul(p, o, n) != o) + #endif /* !LOCKDEBUG */ #endif /* _AMD64_LOCK_H_ */ |