diff options
| author | Miod Vallat <miod@cvs.openbsd.org> | 2014-02-01 21:22:31 +0000 |
|---|---|---|
| committer | Miod Vallat <miod@cvs.openbsd.org> | 2014-02-01 21:22:31 +0000 |
| commit | 34b5785155dab1231743e0be48500e6e2acfa7c4 (patch) | |
| tree | fb03b0e37763354f423e1adf4e67e0d61d1cec5c | |
| parent | 0e3ee277f643e53fa3364ff2872f62528b3f5666 (diff) | |
Simplify try_lock() to avoid one forward branch in the common case.
| -rw-r--r-- | sys/arch/alpha/alpha/mutex.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/sys/arch/alpha/alpha/mutex.c b/sys/arch/alpha/alpha/mutex.c index 57d07f5ac52..ca309024952 100644 --- a/sys/arch/alpha/alpha/mutex.c +++ b/sys/arch/alpha/alpha/mutex.c @@ -1,4 +1,4 @@ -/* $OpenBSD: mutex.c,v 1.8 2014/01/26 17:40:09 miod Exp $ */ +/* $OpenBSD: mutex.c,v 1.9 2014/02/01 21:22:30 miod Exp $ */ /* * Copyright (c) 2004 Artur Grabowski <art@openbsd.org> @@ -46,9 +46,8 @@ try_lock(struct mutex *mtx) " mb \n" " bis $31, 1, %1 \n" /* v0 = 1 */ " br 4f \n" - "2: bis $31, $31, %1 \n" /* v0 = 0 */ - " br 4f \n" "3: br 1b \n" /* update failed */ + "2: bis $31, $31, %1 \n" /* v0 = 0 */ "4: \n" : "=&r" (t0), "=r" (v0), "=m" (mtx->mtx_lock) : "m" (mtx->mtx_lock) @@ -67,6 +66,9 @@ mtx_init(struct mutex *mtx, int wantipl) mtx->mtx_oldipl = IPL_NONE; mtx->mtx_wantipl = wantipl; mtx->mtx_lock = 0; +#ifdef MULTIPROCESSOR + mtx->mtx_owner = NULL; +#endif } void |