diff options
Diffstat (limited to 'lib/libpthread/arch/i386/include/atomic_ops.h')
-rw-r--r-- | lib/libpthread/arch/i386/include/atomic_ops.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/lib/libpthread/arch/i386/include/atomic_ops.h b/lib/libpthread/arch/i386/include/atomic_ops.h new file mode 100644 index 0000000..4d84ae5 --- /dev/null +++ b/lib/libpthread/arch/i386/include/atomic_ops.h @@ -0,0 +1,51 @@ +/* + * Copyright (c) 2001 Daniel Eischen <deischen@FreeBSD.org> + * All rights reserved. + * + * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. + * + * $FreeBSD$ + */ + +#ifndef _ATOMIC_OPS_H_ +#define _ATOMIC_OPS_H_ + +/* + * Atomic swap: + * Atomic (tmp = *dst, *dst = val), then *res = tmp + * + * void atomic_swap_long(long *dst, long val, long *res); + */ +static inline void +atomic_swap_long(long *dst, long val, long *res) +{ + __asm __volatile( + "xchgl %2, %1; movl %2, %0" + : "=m" (*res) : "m" (*dst), "r" (val) : "memory"); +} + +#define atomic_swap_int(d, v, r) \ + atomic_swap_long((long *)(d), (long)(v), (long *)(r)) + +#define atomic_swap_ptr atomic_swap_int + +#endif |