librump/rumpkern/rump_atomic_cas_up.c

1.2  pooka /*	$NetBSD: rump_atomic_cas_up.c,v 1.2 2010/11/23 12:51:10 pooka Exp $	*/
1.1  pooka
1.1  pooka /*-
1.1  pooka  * Copyright (c) 2010 Antti Kantee.  All rights reserved.
1.1  pooka  *
1.1  pooka  * Redistribution and use in source and binary forms, with or without
1.1  pooka  * modification, are permitted provided that the following conditions
1.1  pooka  * are met:
1.1  pooka  * 1. Redistributions of source code must retain the above copyright
1.1  pooka  *    notice, this list of conditions and the following disclaimer.
1.1  pooka  * 2. Redistributions in binary form must reproduce the above copyright
1.1  pooka  *    notice, this list of conditions and the following disclaimer in the
1.1  pooka  *    documentation and/or other materials provided with the distribution.
1.1  pooka  *
1.1  pooka  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
1.1  pooka  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
1.1  pooka  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.1  pooka  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS
1.1  pooka  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.1  pooka  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.1  pooka  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.1  pooka  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.1  pooka  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.1  pooka  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.1  pooka  * POSSIBILITY OF SUCH DAMAGE.
1.1  pooka  */
1.1  pooka
1.1  pooka #include <sys/cdefs.h>
1.2  pooka __KERNEL_RCSID(0, "$NetBSD: rump_atomic_cas_up.c,v 1.2 2010/11/23 12:51:10 pooka Exp $");
1.1  pooka
1.1  pooka /*
1.1  pooka  * Uniprocessor version of atomic CAS.  Since there is no preemption
1.1  pooka  * in rump, this is a piece of cake.
1.1  pooka  */
1.1  pooka
1.1  pooka #include <sys/types.h>
1.1  pooka
1.2  pooka uint32_t rump_cas_32_up(volatile uint32_t *ptr, uint32_t, uint32_t);
1.1  pooka
1.1  pooka uint32_t
1.2  pooka rump_cas_32_up(volatile uint32_t *ptr, uint32_t old, uint32_t new)
1.1  pooka {
1.1  pooka 	uint32_t ret;
1.1  pooka
1.1  pooka 	ret = *ptr;
1.1  pooka 	if (__predict_true(ret == old)) {
1.1  pooka 		*ptr = new;
1.1  pooka 	}
1.1  pooka
1.1  pooka 	return ret;
1.1  pooka }
1.1  pooka
1.2  pooka __strong_alias(atomic_cas_32,rump_cas_32_up)
1.2  pooka __strong_alias(_atomic_cas_32,rump_cas_32_up)
1.2  pooka __strong_alias(atomic_cas_uint,rump_cas_32_up)
1.2  pooka __strong_alias(_atomic_cas_uint,rump_cas_32_up)
1.2  pooka __strong_alias(atomic_cas_ulong,rump_cas_32_up)
1.2  pooka __strong_alias(_atomic_cas_ulong,rump_cas_32_up)
1.2  pooka __strong_alias(atomic_cas_ptr,rump_cas_32_up)
1.2  pooka __strong_alias(_atomic_cas_ptr,rump_cas_32_up)
1.2  pooka __strong_alias(atomic_cas_32_ni,rump_cas_32_up)
1.2  pooka __strong_alias(_atomic_cas_32_ni,rump_cas_32_up)
1.2  pooka __strong_alias(atomic_cas_uint_ni,rump_cas_32_up)
1.2  pooka __strong_alias(_atomic_cas_uint_ni,rump_cas_32_up)
1.2  pooka __strong_alias(atomic_cas_ulong_ni,rump_cas_32_up)
1.2  pooka __strong_alias(_atomic_cas_ulong_ni,rump_cas_32_up)
1.2  pooka __strong_alias(atomic_cas_ptr_ni,rump_cas_32_up)
1.2  pooka __strong_alias(_atomic_cas_ptr_ni,rump_cas_32_up)