diff options
Diffstat (limited to 'lib/libkse/arch/sparc64/include/atomic_ops.h')
| -rw-r--r-- | lib/libkse/arch/sparc64/include/atomic_ops.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/lib/libkse/arch/sparc64/include/atomic_ops.h b/lib/libkse/arch/sparc64/include/atomic_ops.h new file mode 100644 index 0000000..2264ec2 --- /dev/null +++ b/lib/libkse/arch/sparc64/include/atomic_ops.h @@ -0,0 +1,75 @@ +/*- + * Copyright (c) 2003 Jake Burkholder <jake@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. Neither the name of the author nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * 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_ + +#include <machine/atomic.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(volatile long *dst, long val, long *res) +{ + long tmp; + long r; + + tmp = *dst; + for (;;) { + r = atomic_cas_64(dst, tmp, val); + if (r == tmp) + break; + tmp = r; + } + *res = tmp; +} + +static __inline void +atomic_swap_int(volatile int *dst, int val, int *res) +{ + int tmp; + int r; + + tmp = *dst; + for (;;) { + r = atomic_cas_32(dst, tmp, val); + if (r == tmp) + break; + tmp = r; + } + *res = tmp; +} + +#define atomic_swap_ptr(dst, val, res) \ + atomic_swap_long((volatile long *)dst, (long)val, (long *)res) + +#endif |
