atomic.h revision 1.1.2.6
1 1.1.2.3 riastrad /* $NetBSD: atomic.h,v 1.1.2.6 2013/07/24 02:27:38 riastradh Exp $ */ 2 1.1.2.1 riastrad 3 1.1.2.1 riastrad /*- 4 1.1.2.1 riastrad * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 1.1.2.1 riastrad * All rights reserved. 6 1.1.2.1 riastrad * 7 1.1.2.1 riastrad * This code is derived from software contributed to The NetBSD Foundation 8 1.1.2.1 riastrad * by Taylor R. Campbell. 9 1.1.2.1 riastrad * 10 1.1.2.1 riastrad * Redistribution and use in source and binary forms, with or without 11 1.1.2.1 riastrad * modification, are permitted provided that the following conditions 12 1.1.2.1 riastrad * are met: 13 1.1.2.1 riastrad * 1. Redistributions of source code must retain the above copyright 14 1.1.2.1 riastrad * notice, this list of conditions and the following disclaimer. 15 1.1.2.1 riastrad * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.2.1 riastrad * notice, this list of conditions and the following disclaimer in the 17 1.1.2.1 riastrad * documentation and/or other materials provided with the distribution. 18 1.1.2.1 riastrad * 19 1.1.2.1 riastrad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.1.2.1 riastrad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.1.2.1 riastrad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.1.2.1 riastrad * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.1.2.1 riastrad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.1.2.1 riastrad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.1.2.1 riastrad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.1.2.1 riastrad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.1.2.1 riastrad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.1.2.1 riastrad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.1.2.1 riastrad * POSSIBILITY OF SUCH DAMAGE. 30 1.1.2.1 riastrad */ 31 1.1.2.1 riastrad 32 1.1.2.1 riastrad #ifndef _LINUX_ATOMIC_H_ 33 1.1.2.1 riastrad #define _LINUX_ATOMIC_H_ 34 1.1.2.1 riastrad 35 1.1.2.3 riastrad #include <sys/atomic.h> 36 1.1.2.3 riastrad 37 1.1.2.6 riastrad struct atomic { 38 1.1.2.4 riastrad union { 39 1.1.2.4 riastrad int au_int; 40 1.1.2.4 riastrad unsigned int au_uint; 41 1.1.2.4 riastrad } a_u; 42 1.1.2.6 riastrad }; 43 1.1.2.6 riastrad 44 1.1.2.6 riastrad typedef struct atomic atomic_t; 45 1.1.2.2 riastrad 46 1.1.2.2 riastrad static inline int 47 1.1.2.2 riastrad atomic_read(atomic_t *atomic) 48 1.1.2.2 riastrad { 49 1.1.2.4 riastrad return *(volatile int *)&atomic->a_u.au_int; 50 1.1.2.2 riastrad } 51 1.1.2.2 riastrad 52 1.1.2.3 riastrad static inline void 53 1.1.2.3 riastrad atomic_set(atomic_t *atomic, int value) 54 1.1.2.3 riastrad { 55 1.1.2.4 riastrad atomic->a_u.au_int = value; 56 1.1.2.3 riastrad } 57 1.1.2.3 riastrad 58 1.1.2.3 riastrad static inline void 59 1.1.2.3 riastrad atomic_inc(atomic_t *atomic) 60 1.1.2.3 riastrad { 61 1.1.2.4 riastrad atomic_inc_uint(&atomic->a_u.au_uint); 62 1.1.2.4 riastrad } 63 1.1.2.4 riastrad 64 1.1.2.4 riastrad static inline void 65 1.1.2.4 riastrad atomic_dec(atomic_t *atomic) 66 1.1.2.4 riastrad { 67 1.1.2.4 riastrad atomic_dec_uint(&atomic->a_u.au_uint); 68 1.1.2.3 riastrad } 69 1.1.2.3 riastrad 70 1.1.2.3 riastrad static inline int 71 1.1.2.3 riastrad atomic_dec_and_test(atomic_t *atomic) 72 1.1.2.3 riastrad { 73 1.1.2.4 riastrad return (-1 == (int)atomic_dec_uint_nv(&atomic->a_u.au_uint)); 74 1.1.2.3 riastrad } 75 1.1.2.3 riastrad 76 1.1.2.5 riastrad static inline void 77 1.1.2.5 riastrad set_bit(unsigned long bit, volatile unsigned long *ptr) 78 1.1.2.5 riastrad { 79 1.1.2.5 riastrad atomic_or_ulong(ptr, (1 << bit)); 80 1.1.2.5 riastrad } 81 1.1.2.5 riastrad 82 1.1.2.5 riastrad static inline void 83 1.1.2.5 riastrad clear_bit(unsigned long bit, volatile unsigned long *ptr) 84 1.1.2.5 riastrad { 85 1.1.2.5 riastrad atomic_and_ulong(ptr, ~(1 << bit)); 86 1.1.2.5 riastrad } 87 1.1.2.5 riastrad 88 1.1.2.5 riastrad static inline void 89 1.1.2.5 riastrad change_bit(unsigned long bit, volatile unsigned long *ptr) 90 1.1.2.5 riastrad { 91 1.1.2.5 riastrad unsigned long v; 92 1.1.2.5 riastrad 93 1.1.2.5 riastrad do v = *ptr; while (atomic_cas_ulong(ptr, v, v ^ (1 << bit)) != v); 94 1.1.2.5 riastrad } 95 1.1.2.5 riastrad 96 1.1.2.5 riastrad static inline unsigned long 97 1.1.2.5 riastrad test_and_set_bit(unsigned long bit, volatile unsigned long *ptr) 98 1.1.2.5 riastrad { 99 1.1.2.5 riastrad unsigned long v; 100 1.1.2.5 riastrad 101 1.1.2.5 riastrad do v = *ptr; while (atomic_cas_ulong(ptr, v, v | (1 << bit)) != v); 102 1.1.2.5 riastrad 103 1.1.2.5 riastrad return (v & (1 << bit)); 104 1.1.2.5 riastrad } 105 1.1.2.5 riastrad 106 1.1.2.5 riastrad static inline unsigned long 107 1.1.2.5 riastrad test_and_clear_bit(unsigned long bit, volatile unsigned long *ptr) 108 1.1.2.5 riastrad { 109 1.1.2.5 riastrad unsigned long v; 110 1.1.2.5 riastrad 111 1.1.2.5 riastrad do v = *ptr; while (atomic_cas_ulong(ptr, v, v &~ (1 << bit)) != v); 112 1.1.2.5 riastrad 113 1.1.2.5 riastrad return (v & (1 << bit)); 114 1.1.2.5 riastrad } 115 1.1.2.5 riastrad 116 1.1.2.5 riastrad static inline unsigned long 117 1.1.2.5 riastrad test_and_change_bit(unsigned long bit, volatile unsigned long *ptr) 118 1.1.2.5 riastrad { 119 1.1.2.5 riastrad unsigned long v; 120 1.1.2.5 riastrad 121 1.1.2.5 riastrad do v = *ptr; while (atomic_cas_ulong(ptr, v, v ^ (1 << bit)) != v); 122 1.1.2.5 riastrad 123 1.1.2.5 riastrad return (v & (1 << bit)); 124 1.1.2.5 riastrad } 125 1.1.2.5 riastrad 126 1.1.2.1 riastrad #endif /* _LINUX_ATOMIC_H_ */ 127
Indexes created Thu Oct 02 07:10:07 GMT 2025