atomic.h revision 1.1.2.2
1 1.1.2.2 yamt /* $NetBSD: atomic.h,v 1.1.2.2 2006/04/11 11:53:35 yamt Exp $ */ 2 1.1.2.2 yamt 3 1.1.2.2 yamt /*- 4 1.1.2.2 yamt * Copyright (c) 1998 Doug Rabson 5 1.1.2.2 yamt * All rights reserved. 6 1.1.2.2 yamt * 7 1.1.2.2 yamt * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 yamt * modification, are permitted provided that the following conditions 9 1.1.2.2 yamt * are met: 10 1.1.2.2 yamt * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 yamt * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 yamt * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 yamt * documentation and/or other materials provided with the distribution. 15 1.1.2.2 yamt * 16 1.1.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 1.1.2.2 yamt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 1.1.2.2 yamt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 1.1.2.2 yamt * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 1.1.2.2 yamt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 1.1.2.2 yamt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 1.1.2.2 yamt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 1.1.2.2 yamt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 1.1.2.2 yamt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.2.2 yamt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.2.2 yamt * SUCH DAMAGE. 27 1.1.2.2 yamt * 28 1.1.2.2 yamt * $FreeBSD: src/sys/ia64/include/atomic.h,v 1.10 2005/09/27 17:39:10 jhb Exp $ 29 1.1.2.2 yamt */ 30 1.1.2.2 yamt 31 1.1.2.2 yamt #ifndef _MACHINE_ATOMIC_H_ 32 1.1.2.2 yamt #define _MACHINE_ATOMIC_H_ 33 1.1.2.2 yamt 34 1.1.2.2 yamt /* 35 1.1.2.2 yamt * Various simple arithmetic on memory which is atomic in the presence 36 1.1.2.2 yamt * of interrupts and SMP safe. 37 1.1.2.2 yamt */ 38 1.1.2.2 yamt 39 1.1.2.2 yamt /* 40 1.1.2.2 yamt * Everything is built out of cmpxchg. 41 1.1.2.2 yamt */ 42 1.1.2.2 yamt #define IA64_CMPXCHG(sz, sem, p, cmpval, newval, ret) \ 43 1.1.2.2 yamt __asm __volatile ( \ 44 1.1.2.2 yamt "mov ar.ccv=%2;;\n\t" \ 45 1.1.2.2 yamt "cmpxchg" #sz "." #sem " %0=%4,%3,ar.ccv\n\t" \ 46 1.1.2.2 yamt : "=r" (ret), "=m" (*p) \ 47 1.1.2.2 yamt : "r" (cmpval), "r" (newval), "m" (*p) \ 48 1.1.2.2 yamt : "memory") 49 1.1.2.2 yamt 50 1.1.2.2 yamt /* 51 1.1.2.2 yamt * Some common forms of cmpxch. 52 1.1.2.2 yamt */ 53 1.1.2.2 yamt static __inline uint32_t 54 1.1.2.2 yamt ia64_cmpxchg_acq_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval) 55 1.1.2.2 yamt { 56 1.1.2.2 yamt uint32_t ret; 57 1.1.2.2 yamt IA64_CMPXCHG(4, acq, p, cmpval, newval, ret); 58 1.1.2.2 yamt return (ret); 59 1.1.2.2 yamt } 60 1.1.2.2 yamt 61 1.1.2.2 yamt static __inline uint32_t 62 1.1.2.2 yamt ia64_cmpxchg_rel_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval) 63 1.1.2.2 yamt { 64 1.1.2.2 yamt uint32_t ret; 65 1.1.2.2 yamt IA64_CMPXCHG(4, rel, p, cmpval, newval, ret); 66 1.1.2.2 yamt return (ret); 67 1.1.2.2 yamt } 68 1.1.2.2 yamt 69 1.1.2.2 yamt static __inline uint64_t 70 1.1.2.2 yamt ia64_cmpxchg_acq_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval) 71 1.1.2.2 yamt { 72 1.1.2.2 yamt uint64_t ret; 73 1.1.2.2 yamt IA64_CMPXCHG(8, acq, p, cmpval, newval, ret); 74 1.1.2.2 yamt return (ret); 75 1.1.2.2 yamt } 76 1.1.2.2 yamt 77 1.1.2.2 yamt static __inline uint64_t 78 1.1.2.2 yamt ia64_cmpxchg_rel_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval) 79 1.1.2.2 yamt { 80 1.1.2.2 yamt uint64_t ret; 81 1.1.2.2 yamt IA64_CMPXCHG(8, rel, p, cmpval, newval, ret); 82 1.1.2.2 yamt return (ret); 83 1.1.2.2 yamt } 84 1.1.2.2 yamt 85 1.1.2.2 yamt #define ATOMIC_STORE_LOAD(type, width, size) \ 86 1.1.2.2 yamt static __inline uint##width##_t \ 87 1.1.2.2 yamt ia64_ld_acq_##width(volatile uint##width##_t* p) \ 88 1.1.2.2 yamt { \ 89 1.1.2.2 yamt uint##width##_t v; \ 90 1.1.2.2 yamt __asm __volatile ("ld" size ".acq %0=%1" : "=r" (v) \ 91 1.1.2.2 yamt : "m" (*p) : "memory"); \ 92 1.1.2.2 yamt return (v); \ 93 1.1.2.2 yamt } \ 94 1.1.2.2 yamt \ 95 1.1.2.2 yamt static __inline uint##width##_t \ 96 1.1.2.2 yamt atomic_load_acq_##width(volatile uint##width##_t* p) \ 97 1.1.2.2 yamt { \ 98 1.1.2.2 yamt uint##width##_t v; \ 99 1.1.2.2 yamt __asm __volatile ("ld" size ".acq %0=%1" : "=r" (v) \ 100 1.1.2.2 yamt : "m" (*p) : "memory"); \ 101 1.1.2.2 yamt return (v); \ 102 1.1.2.2 yamt } \ 103 1.1.2.2 yamt \ 104 1.1.2.2 yamt static __inline uint##width##_t \ 105 1.1.2.2 yamt atomic_load_acq_##type(volatile uint##width##_t* p) \ 106 1.1.2.2 yamt { \ 107 1.1.2.2 yamt uint##width##_t v; \ 108 1.1.2.2 yamt __asm __volatile ("ld" size ".acq %0=%1" : "=r" (v) \ 109 1.1.2.2 yamt : "m" (*p) : "memory"); \ 110 1.1.2.2 yamt return (v); \ 111 1.1.2.2 yamt } \ 112 1.1.2.2 yamt \ 113 1.1.2.2 yamt static __inline void \ 114 1.1.2.2 yamt ia64_st_rel_##width(volatile uint##width##_t* p, uint##width##_t v) \ 115 1.1.2.2 yamt { \ 116 1.1.2.2 yamt __asm __volatile ("st" size ".rel %0=%1" : "=m" (*p) \ 117 1.1.2.2 yamt : "r" (v) : "memory"); \ 118 1.1.2.2 yamt } \ 119 1.1.2.2 yamt \ 120 1.1.2.2 yamt static __inline void \ 121 1.1.2.2 yamt atomic_store_rel_##width(volatile uint##width##_t* p, \ 122 1.1.2.2 yamt uint##width##_t v) \ 123 1.1.2.2 yamt { \ 124 1.1.2.2 yamt __asm __volatile ("st" size ".rel %0=%1" : "=m" (*p) \ 125 1.1.2.2 yamt : "r" (v) : "memory"); \ 126 1.1.2.2 yamt } \ 127 1.1.2.2 yamt \ 128 1.1.2.2 yamt static __inline void \ 129 1.1.2.2 yamt atomic_store_rel_##type(volatile uint##width##_t* p, \ 130 1.1.2.2 yamt uint##width##_t v) \ 131 1.1.2.2 yamt { \ 132 1.1.2.2 yamt __asm __volatile ("st" size ".rel %0=%1" : "=m" (*p) \ 133 1.1.2.2 yamt : "r" (v) : "memory"); \ 134 1.1.2.2 yamt } 135 1.1.2.2 yamt 136 1.1.2.2 yamt ATOMIC_STORE_LOAD(char, 8, "1") 137 1.1.2.2 yamt ATOMIC_STORE_LOAD(short, 16, "2") 138 1.1.2.2 yamt ATOMIC_STORE_LOAD(int, 32, "4") 139 1.1.2.2 yamt ATOMIC_STORE_LOAD(long, 64, "8") 140 1.1.2.2 yamt 141 1.1.2.2 yamt #undef ATOMIC_STORE_LOAD 142 1.1.2.2 yamt 143 1.1.2.2 yamt #define atomic_load_acq_ptr atomic_load_acq_64 144 1.1.2.2 yamt #define atomic_store_rel_ptr atomic_store_rel_64 145 1.1.2.2 yamt 146 1.1.2.2 yamt #define IA64_ATOMIC(sz, type, name, width, op) \ 147 1.1.2.2 yamt static __inline type \ 148 1.1.2.2 yamt atomic_##name##_acq_##width(volatile type *p, type v) \ 149 1.1.2.2 yamt { \ 150 1.1.2.2 yamt type old, ret; \ 151 1.1.2.2 yamt do { \ 152 1.1.2.2 yamt old = *p; \ 153 1.1.2.2 yamt IA64_CMPXCHG(sz, acq, p, old, old op v, ret); \ 154 1.1.2.2 yamt } while (ret != old); \ 155 1.1.2.2 yamt return (old); \ 156 1.1.2.2 yamt } \ 157 1.1.2.2 yamt \ 158 1.1.2.2 yamt static __inline type \ 159 1.1.2.2 yamt atomic_##name##_rel_##width(volatile type *p, type v) \ 160 1.1.2.2 yamt { \ 161 1.1.2.2 yamt type old, ret; \ 162 1.1.2.2 yamt do { \ 163 1.1.2.2 yamt old = *p; \ 164 1.1.2.2 yamt IA64_CMPXCHG(sz, rel, p, old, old op v, ret); \ 165 1.1.2.2 yamt } while (ret != old); \ 166 1.1.2.2 yamt return (old); \ 167 1.1.2.2 yamt } 168 1.1.2.2 yamt 169 1.1.2.2 yamt IA64_ATOMIC(1, uint8_t, set, 8, |) 170 1.1.2.2 yamt IA64_ATOMIC(2, uint16_t, set, 16, |) 171 1.1.2.2 yamt IA64_ATOMIC(4, uint32_t, set, 32, |) 172 1.1.2.2 yamt IA64_ATOMIC(8, uint64_t, set, 64, |) 173 1.1.2.2 yamt 174 1.1.2.2 yamt IA64_ATOMIC(1, uint8_t, clear, 8, &~) 175 1.1.2.2 yamt IA64_ATOMIC(2, uint16_t, clear, 16, &~) 176 1.1.2.2 yamt IA64_ATOMIC(4, uint32_t, clear, 32, &~) 177 1.1.2.2 yamt IA64_ATOMIC(8, uint64_t, clear, 64, &~) 178 1.1.2.2 yamt 179 1.1.2.2 yamt IA64_ATOMIC(1, uint8_t, add, 8, +) 180 1.1.2.2 yamt IA64_ATOMIC(2, uint16_t, add, 16, +) 181 1.1.2.2 yamt IA64_ATOMIC(4, uint32_t, add, 32, +) 182 1.1.2.2 yamt IA64_ATOMIC(8, uint64_t, add, 64, +) 183 1.1.2.2 yamt 184 1.1.2.2 yamt IA64_ATOMIC(1, uint8_t, subtract, 8, -) 185 1.1.2.2 yamt IA64_ATOMIC(2, uint16_t, subtract, 16, -) 186 1.1.2.2 yamt IA64_ATOMIC(4, uint32_t, subtract, 32, -) 187 1.1.2.2 yamt IA64_ATOMIC(8, uint64_t, subtract, 64, -) 188 1.1.2.2 yamt 189 1.1.2.2 yamt #undef IA64_ATOMIC 190 1.1.2.2 yamt 191 1.1.2.2 yamt #define atomic_set_8 atomic_set_acq_8 192 1.1.2.2 yamt #define atomic_clear_8 atomic_clear_acq_8 193 1.1.2.2 yamt #define atomic_add_8 atomic_add_acq_8 194 1.1.2.2 yamt #define atomic_subtract_8 atomic_subtract_acq_8 195 1.1.2.2 yamt 196 1.1.2.2 yamt #define atomic_set_16 atomic_set_acq_16 197 1.1.2.2 yamt #define atomic_clear_16 atomic_clear_acq_16 198 1.1.2.2 yamt #define atomic_add_16 atomic_add_acq_16 199 1.1.2.2 yamt #define atomic_subtract_16 atomic_subtract_acq_16 200 1.1.2.2 yamt 201 1.1.2.2 yamt #define atomic_set_32 atomic_set_acq_32 202 1.1.2.2 yamt #define atomic_clear_32 atomic_clear_acq_32 203 1.1.2.2 yamt #define atomic_add_32 atomic_add_acq_32 204 1.1.2.2 yamt #define atomic_subtract_32 atomic_subtract_acq_32 205 1.1.2.2 yamt 206 1.1.2.2 yamt #define atomic_set_64 atomic_set_acq_64 207 1.1.2.2 yamt #define atomic_clear_64 atomic_clear_acq_64 208 1.1.2.2 yamt #define atomic_add_64 atomic_add_acq_64 209 1.1.2.2 yamt #define atomic_subtract_64 atomic_subtract_acq_64 210 1.1.2.2 yamt 211 1.1.2.2 yamt #define atomic_set_char atomic_set_8 212 1.1.2.2 yamt #define atomic_clear_char atomic_clear_8 213 1.1.2.2 yamt #define atomic_add_char atomic_add_8 214 1.1.2.2 yamt #define atomic_subtract_char atomic_subtract_8 215 1.1.2.2 yamt #define atomic_set_acq_char atomic_set_acq_8 216 1.1.2.2 yamt #define atomic_clear_acq_char atomic_clear_acq_8 217 1.1.2.2 yamt #define atomic_add_acq_char atomic_add_acq_8 218 1.1.2.2 yamt #define atomic_subtract_acq_char atomic_subtract_acq_8 219 1.1.2.2 yamt #define atomic_set_rel_char atomic_set_rel_8 220 1.1.2.2 yamt #define atomic_clear_rel_char atomic_clear_rel_8 221 1.1.2.2 yamt #define atomic_add_rel_char atomic_add_rel_8 222 1.1.2.2 yamt #define atomic_subtract_rel_char atomic_subtract_rel_8 223 1.1.2.2 yamt 224 1.1.2.2 yamt #define atomic_set_short atomic_set_16 225 1.1.2.2 yamt #define atomic_clear_short atomic_clear_16 226 1.1.2.2 yamt #define atomic_add_short atomic_add_16 227 1.1.2.2 yamt #define atomic_subtract_short atomic_subtract_16 228 1.1.2.2 yamt #define atomic_set_acq_short atomic_set_acq_16 229 1.1.2.2 yamt #define atomic_clear_acq_short atomic_clear_acq_16 230 1.1.2.2 yamt #define atomic_add_acq_short atomic_add_acq_16 231 1.1.2.2 yamt #define atomic_subtract_acq_short atomic_subtract_acq_16 232 1.1.2.2 yamt #define atomic_set_rel_short atomic_set_rel_16 233 1.1.2.2 yamt #define atomic_clear_rel_short atomic_clear_rel_16 234 1.1.2.2 yamt #define atomic_add_rel_short atomic_add_rel_16 235 1.1.2.2 yamt #define atomic_subtract_rel_short atomic_subtract_rel_16 236 1.1.2.2 yamt 237 1.1.2.2 yamt #define atomic_set_int atomic_set_32 238 1.1.2.2 yamt #define atomic_clear_int atomic_clear_32 239 1.1.2.2 yamt #define atomic_add_int atomic_add_32 240 1.1.2.2 yamt #define atomic_subtract_int atomic_subtract_32 241 1.1.2.2 yamt #define atomic_set_acq_int atomic_set_acq_32 242 1.1.2.2 yamt #define atomic_clear_acq_int atomic_clear_acq_32 243 1.1.2.2 yamt #define atomic_add_acq_int atomic_add_acq_32 244 1.1.2.2 yamt #define atomic_subtract_acq_int atomic_subtract_acq_32 245 1.1.2.2 yamt #define atomic_set_rel_int atomic_set_rel_32 246 1.1.2.2 yamt #define atomic_clear_rel_int atomic_clear_rel_32 247 1.1.2.2 yamt #define atomic_add_rel_int atomic_add_rel_32 248 1.1.2.2 yamt #define atomic_subtract_rel_int atomic_subtract_rel_32 249 1.1.2.2 yamt 250 1.1.2.2 yamt #define atomic_set_long atomic_set_64 251 1.1.2.2 yamt #define atomic_clear_long atomic_clear_64 252 1.1.2.2 yamt #define atomic_add_long atomic_add_64 253 1.1.2.2 yamt #define atomic_subtract_long atomic_subtract_64 254 1.1.2.2 yamt #define atomic_set_acq_long atomic_set_acq_64 255 1.1.2.2 yamt #define atomic_clear_acq_long atomic_clear_acq_64 256 1.1.2.2 yamt #define atomic_add_acq_long atomic_add_acq_64 257 1.1.2.2 yamt #define atomic_subtract_acq_long atomic_subtract_acq_64 258 1.1.2.2 yamt #define atomic_set_rel_long atomic_set_rel_64 259 1.1.2.2 yamt #define atomic_clear_rel_long atomic_clear_rel_64 260 1.1.2.2 yamt #define atomic_add_rel_long atomic_add_rel_64 261 1.1.2.2 yamt #define atomic_subtract_rel_long atomic_subtract_rel_64 262 1.1.2.2 yamt 263 1.1.2.2 yamt #define atomic_set_ptr atomic_set_64 264 1.1.2.2 yamt #define atomic_clear_ptr atomic_clear_64 265 1.1.2.2 yamt #define atomic_add_ptr atomic_add_64 266 1.1.2.2 yamt #define atomic_subtract_ptr atomic_subtract_64 267 1.1.2.2 yamt #define atomic_set_acq_ptr atomic_set_acq_64 268 1.1.2.2 yamt #define atomic_clear_acq_ptr atomic_clear_acq_64 269 1.1.2.2 yamt #define atomic_add_acq_ptr atomic_add_acq_64 270 1.1.2.2 yamt #define atomic_subtract_acq_ptr atomic_subtract_acq_64 271 1.1.2.2 yamt #define atomic_set_rel_ptr atomic_set_rel_64 272 1.1.2.2 yamt #define atomic_clear_rel_ptr atomic_clear_rel_64 273 1.1.2.2 yamt #define atomic_add_rel_ptr atomic_add_rel_64 274 1.1.2.2 yamt #define atomic_subtract_rel_ptr atomic_subtract_rel_64 275 1.1.2.2 yamt 276 1.1.2.2 yamt #undef IA64_CMPXCHG 277 1.1.2.2 yamt 278 1.1.2.2 yamt /* 279 1.1.2.2 yamt * Atomically compare the value stored at *p with cmpval and if the 280 1.1.2.2 yamt * two values are equal, update the value of *p with newval. Returns 281 1.1.2.2 yamt * zero if the compare failed, nonzero otherwise. 282 1.1.2.2 yamt */ 283 1.1.2.2 yamt static __inline int 284 1.1.2.2 yamt atomic_cmpset_acq_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval) 285 1.1.2.2 yamt { 286 1.1.2.2 yamt return (ia64_cmpxchg_acq_32(p, cmpval, newval) == cmpval); 287 1.1.2.2 yamt } 288 1.1.2.2 yamt 289 1.1.2.2 yamt static __inline int 290 1.1.2.2 yamt atomic_cmpset_rel_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval) 291 1.1.2.2 yamt { 292 1.1.2.2 yamt return (ia64_cmpxchg_rel_32(p, cmpval, newval) == cmpval); 293 1.1.2.2 yamt } 294 1.1.2.2 yamt 295 1.1.2.2 yamt /* 296 1.1.2.2 yamt * Atomically compare the value stored at *p with cmpval and if the 297 1.1.2.2 yamt * two values are equal, update the value of *p with newval. Returns 298 1.1.2.2 yamt * zero if the compare failed, nonzero otherwise. 299 1.1.2.2 yamt */ 300 1.1.2.2 yamt static __inline int 301 1.1.2.2 yamt atomic_cmpset_acq_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval) 302 1.1.2.2 yamt { 303 1.1.2.2 yamt return (ia64_cmpxchg_acq_64(p, cmpval, newval) == cmpval); 304 1.1.2.2 yamt } 305 1.1.2.2 yamt 306 1.1.2.2 yamt static __inline int 307 1.1.2.2 yamt atomic_cmpset_rel_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval) 308 1.1.2.2 yamt { 309 1.1.2.2 yamt return (ia64_cmpxchg_rel_64(p, cmpval, newval) == cmpval); 310 1.1.2.2 yamt } 311 1.1.2.2 yamt 312 1.1.2.2 yamt #define atomic_cmpset_32 atomic_cmpset_acq_32 313 1.1.2.2 yamt #define atomic_cmpset_64 atomic_cmpset_acq_64 314 1.1.2.2 yamt #define atomic_cmpset_int atomic_cmpset_32 315 1.1.2.2 yamt #define atomic_cmpset_long atomic_cmpset_64 316 1.1.2.2 yamt #define atomic_cmpset_ptr atomic_cmpset_64 317 1.1.2.2 yamt #define atomic_cmpset_acq_int atomic_cmpset_acq_32 318 1.1.2.2 yamt #define atomic_cmpset_rel_int atomic_cmpset_rel_32 319 1.1.2.2 yamt #define atomic_cmpset_acq_long atomic_cmpset_acq_64 320 1.1.2.2 yamt #define atomic_cmpset_rel_long atomic_cmpset_rel_64 321 1.1.2.2 yamt #define atomic_cmpset_acq_ptr atomic_cmpset_acq_64 322 1.1.2.2 yamt #define atomic_cmpset_rel_ptr atomic_cmpset_rel_64 323 1.1.2.2 yamt 324 1.1.2.2 yamt static __inline uint32_t 325 1.1.2.2 yamt atomic_readandclear_32(volatile uint32_t* p) 326 1.1.2.2 yamt { 327 1.1.2.2 yamt uint32_t val; 328 1.1.2.2 yamt do { 329 1.1.2.2 yamt val = *p; 330 1.1.2.2 yamt } while (!atomic_cmpset_32(p, val, 0)); 331 1.1.2.2 yamt return (val); 332 1.1.2.2 yamt } 333 1.1.2.2 yamt 334 1.1.2.2 yamt static __inline uint64_t 335 1.1.2.2 yamt atomic_readandclear_64(volatile uint64_t* p) 336 1.1.2.2 yamt { 337 1.1.2.2 yamt uint64_t val; 338 1.1.2.2 yamt do { 339 1.1.2.2 yamt val = *p; 340 1.1.2.2 yamt } while (!atomic_cmpset_64(p, val, 0)); 341 1.1.2.2 yamt return (val); 342 1.1.2.2 yamt } 343 1.1.2.2 yamt 344 1.1.2.2 yamt #define atomic_readandclear_int atomic_readandclear_32 345 1.1.2.2 yamt #define atomic_readandclear_long atomic_readandclear_64 346 1.1.2.2 yamt 347 1.1.2.2 yamt /* 348 1.1.2.2 yamt * Atomically add the value of v to the integer pointed to by p and return 349 1.1.2.2 yamt * the previous value of *p. 350 1.1.2.2 yamt * 351 1.1.2.2 yamt * XXX: Should we use the fetchadd instruction here? 352 1.1.2.2 yamt */ 353 1.1.2.2 yamt static __inline uint32_t 354 1.1.2.2 yamt atomic_fetchadd_32(volatile uint32_t *p, uint32_t v) 355 1.1.2.2 yamt { 356 1.1.2.2 yamt uint32_t value; 357 1.1.2.2 yamt 358 1.1.2.2 yamt do { 359 1.1.2.2 yamt value = *p; 360 1.1.2.2 yamt } while (!atomic_cmpset_32(p, value, value + v)); 361 1.1.2.2 yamt return (value); 362 1.1.2.2 yamt } 363 1.1.2.2 yamt 364 1.1.2.2 yamt #define atomic_fetchadd_int atomic_fetchadd_32 365 1.1.2.2 yamt 366 1.1.2.2 yamt #endif /* ! _MACHINE_ATOMIC_H_ */ 367
Indexes created Wed Oct 15 16:09:53 GMT 2025