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#ifndef _ATOMIC_LONG_H_ 29#define _ATOMIC_LONG_H_ 30 31#include <sys/cdefs.h> 32#include <sys/types.h> 33#include <machine/atomic.h> 34 35typedef struct { 36 volatile u_long counter; 37} atomic_long_t; 38 39#define atomic_long_add(i, v) atomic_long_add_return((i), (v)) 40#define atomic_long_inc_return(v) atomic_long_add_return(1, (v)) 41 42static inline long 43atomic_long_add_return(long i, atomic_long_t *v) 44{ 45 return i + atomic_fetchadd_long(&v->counter, i); 46} 47 48static inline void 49atomic_long_set(atomic_long_t *v, long i) 50{ 51 atomic_store_rel_long(&v->counter, i); 52} 53 54static inline long 55atomic_long_read(atomic_long_t *v) 56{ 57 return atomic_load_acq_long(&v->counter); 58} 59 60static inline long 61atomic_long_inc(atomic_long_t *v) 62{ 63 return atomic_fetchadd_long(&v->counter, 1) + 1; 64} 65 66static inline long 67atomic_long_dec(atomic_long_t *v) 68{ 69 return atomic_fetchadd_long(&v->counter, -1) - 1; 70} 71 72static inline long 73atomic_long_dec_and_test(atomic_long_t *v) 74{ 75 long i = atomic_long_add(-1, v); 76 return i == 0 ; 77} 78 79#endif /* _ATOMIC_LONG_H_ */ 80