diff options
| -rw-r--r-- | lib/libpthread/arch/m88k/_atomic_lock.c | 44 |
1 files changed, 41 insertions, 3 deletions
diff --git a/lib/libpthread/arch/m88k/_atomic_lock.c b/lib/libpthread/arch/m88k/_atomic_lock.c index 8d4d0ba2182..ad982a0f1c1 100644 --- a/lib/libpthread/arch/m88k/_atomic_lock.c +++ b/lib/libpthread/arch/m88k/_atomic_lock.c @@ -1,6 +1,31 @@ -/* $OpenBSD: _atomic_lock.c,v 1.2 2002/10/11 19:08:41 marc Exp $ */ +/* $OpenBSD: _atomic_lock.c,v 1.3 2003/10/26 14:50:26 miod Exp $ */ /* - * Atomic lock for m68k + * Copyright (c) 2003, Miodrag Vallat. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * Atomic lock for m88k */ #include "spinlock.h" @@ -8,5 +33,18 @@ int _atomic_lock(volatile _spinlock_lock_t *lock) { - return (_thread_slow_atomic_lock(lock)); + _spinlock_lock_t old; + + old = _SPINLOCK_LOCKED; + __asm__ __volatile__ + ("xmem %0, %2, r0" : "=r" (old) : "0" (old), "r" (lock)); + + return (old != _SPINLOCK_UNLOCKED); +} + +int +_atomic_is_locked(volatile _spinlock_lock_t *lock) +{ + + return (*lock != _SPINLOCK_UNLOCKED); } |