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atomic_load.c revision 1.2.2.2 
      1  1.2.2.2  tls /*	$NetBSD: atomic_load.c,v 1.2.2.2 2014/08/10 06:47:06 tls Exp $	*/
      2  1.2.2.2  tls 
      3  1.2.2.2  tls /*-
      4  1.2.2.2  tls  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  1.2.2.2  tls  * All rights reserved.
      6  1.2.2.2  tls  *
      7  1.2.2.2  tls  * Redistribution and use in source and binary forms, with or without
      8  1.2.2.2  tls  * modification, are permitted provided that the following conditions
      9  1.2.2.2  tls  * are met:
     10  1.2.2.2  tls  * 1. Redistributions of source code must retain the above copyright
     11  1.2.2.2  tls  *    notice, this list of conditions and the following disclaimer.
     12  1.2.2.2  tls  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.2.2.2  tls  *    notice, this list of conditions and the following disclaimer in the
     14  1.2.2.2  tls  *    documentation and/or other materials provided with the distribution.
     15  1.2.2.2  tls  *
     16  1.2.2.2  tls  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  1.2.2.2  tls  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  1.2.2.2  tls  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  1.2.2.2  tls  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  1.2.2.2  tls  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  1.2.2.2  tls  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  1.2.2.2  tls  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  1.2.2.2  tls  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  1.2.2.2  tls  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  1.2.2.2  tls  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  1.2.2.2  tls  * POSSIBILITY OF SUCH DAMAGE.
     27  1.2.2.2  tls  */
     28  1.2.2.2  tls 
     29  1.2.2.2  tls #include <sys/cdefs.h>
     30  1.2.2.2  tls __RCSID("$NetBSD: atomic_load.c,v 1.2.2.2 2014/08/10 06:47:06 tls Exp $");
     31  1.2.2.2  tls 
     32  1.2.2.2  tls #include "atomic_op_namespace.h"
     33  1.2.2.2  tls 
     34  1.2.2.2  tls #include <sys/types.h>
     35  1.2.2.2  tls #include <sys/atomic.h>
     36  1.2.2.2  tls 
     37  1.2.2.2  tls #define atomic_load_n(n,b) \
     38  1.2.2.2  tls uint ## b ## _t __atomic_load_ ## n(volatile uint ## b ## _t *, int); \
     39  1.2.2.2  tls uint ## b ## _t \
     40  1.2.2.2  tls __atomic_load_ ## n(volatile uint ## b ## _t *ptr, int memmodel) \
     41  1.2.2.2  tls { \
     42  1.2.2.2  tls 	uint## b ##_t val; \
     43  1.2.2.2  tls 	membar_enter(); \
     44  1.2.2.2  tls 	val = *ptr; \
     45  1.2.2.2  tls 	membar_exit(); \
     46  1.2.2.2  tls 	return val; \
     47  1.2.2.2  tls }
     48  1.2.2.2  tls 
     49  1.2.2.2  tls atomic_load_n(1, 8)
     50  1.2.2.2  tls atomic_load_n(2, 16)
     51  1.2.2.2  tls atomic_load_n(4, 32)
     52  1.2.2.2  tls #ifdef	__HAVE_ATOMIC_CAS_64_UP
     53  1.2.2.2  tls atomic_load_n(8, 64)
     54  1.2.2.2  tls #endif
     55