atomic.h revision 219820
1/*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#ifndef _ASM_ATOMIC_H_ 30#define _ASM_ATOMIC_H_ 31 32#include <sys/cdefs.h> 33#include <sys/types.h> 34#include <machine/atomic.h> 35#include <asm/atomic-long.h> 36 37typedef struct { 38 volatile u_int counter; 39} atomic_t; 40 41#define atomic_add(i, v) atomic_add_return((i), (v)) 42#define atomic_sub(i, v) atomic_sub_return((i), (v)) 43#define atomic_inc_return(v) atomic_add_return(1, (v)) 44#define atomic_add_negative(i, v) (atomic_add_return((i), (v)) < 0) 45#define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0) 46#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) 47#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) 48 49static inline int 50atomic_add_return(int i, atomic_t *v) 51{ 52 return i + atomic_fetchadd_int(&v->counter, i); 53} 54 55static inline int 56atomic_sub_return(int i, atomic_t *v) 57{ 58 return atomic_fetchadd_int(&v->counter, -i) - i; 59} 60 61static inline void 62atomic_set(atomic_t *v, int i) 63{ 64 atomic_store_rel_int(&v->counter, i); 65} 66 67static inline int 68atomic_read(atomic_t *v) 69{ 70 return atomic_load_acq_int(&v->counter); 71} 72 73static inline int 74atomic_inc(atomic_t *v) 75{ 76 return atomic_fetchadd_int(&v->counter, 1) + 1; 77} 78 79static inline int 80atomic_dec(atomic_t *v) 81{ 82 return atomic_fetchadd_int(&v->counter, -1) - 1; 83} 84 85#endif /* _ASM_ATOMIC_H_ */ 86