src/rx/rx_atomic.h

   1 /*
   2  * Copyright (c) 2010 Your Filesystem Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  */
  24
  25 #ifndef OPENAFS_RX_ATOMIC_H
  26 #define OPENAFS_RX_ATOMIC_H 1
  27
  28 #define RX_ATOMIC_INIT(i) { (i) }
  29
  30 #ifdef AFS_NT40_ENV
  31 typedef struct {
  32     volatile int var;
  33 } rx_atomic_t;
  34
  35 static_inline void
  36 rx_atomic_set(rx_atomic_t *atomic, int val) {
  37     atomic->var = val;
  38 }
  39
  40 static_inline int
  41 rx_atomic_read(rx_atomic_t *atomic) {
  42     return atomic->var;
  43 }
  44
  45 static_inline void
  46 rx_atomic_inc(rx_atomic_t *atomic) {
  47     InterlockedIncrement(&atomic->var);
  48 }
  49
  50 static_inline int
  51 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
  52     return InterlockedIncrement(&atomic->var);
  53 }
  54
  55 static_inline void
  56 rx_atomic_add(rx_atomic_t *atomic, int change) {
  57     InterlockedExchangeAdd(&atomic->var, change);
  58 }
  59
  60 static_inline void
  61 rx_atomic_dec(rx_atomic_t *atomic) {
  62     InterlockedDecrement(&atomic->var);
  63 }
  64
  65 static_inline int
  66 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
  67     return InterlockedDecrement(&atomic->var);
  68 }
  69
  70 static_inline void
  71 rx_atomic_sub(rx_atomic_t *atomic, int change) {
  72     InterlockedExchangeAdd(&atomic->var, 0 - change);
  73 }
  74
  75 #elif defined(AFS_DARWIN80_ENV) || defined(AFS_USR_DARWIN80_ENV)
  76
  77 #include <libkern/OSAtomic.h>
  78 #if defined(KERNEL) && !defined(UKERNEL)
  79 #define OSAtomicIncrement32 OSIncrementAtomic
  80 #define OSAtomicAdd32 OSAddAtomic
  81 #define OSAtomicDecrement32 OSDecrementAtomic
  82 #endif
  83
  84 typedef struct {
  85     volatile int var;
  86 } rx_atomic_t;
  87
  88 static_inline void
  89 rx_atomic_set(rx_atomic_t *atomic, int val) {
  90     atomic->var = val;
  91 }
  92
  93 static_inline int
  94 rx_atomic_read(rx_atomic_t *atomic) {
  95     return atomic->var;
  96 }
  97
  98 static_inline void
  99 rx_atomic_inc(rx_atomic_t *atomic) {
 100     OSAtomicIncrement32(&atomic->var);
 101 }
 102
 103 static_inline int
 104 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
 105     return OSAtomicIncrement32(&atomic->var);
 106 }
 107
 108 static_inline void
 109 rx_atomic_add(rx_atomic_t *atomic, int change) {
 110     OSAtomicAdd32(change, &atomic->var);
 111 }
 112
 113 static_inline void
 114 rx_atomic_dec(rx_atomic_t *atomic) {
 115     OSAtomicDecrement32(&atomic->var);
 116 }
 117
 118 static_inline int
 119 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
 120     return OSAtomicDecrement32(&atomic->var);
 121 }
 122
 123 static_inline void
 124 rx_atomic_sub(rx_atomic_t *atomic, int change) {
 125     OSAtomicAdd32(0 - change, &atomic->var);
 126 }
 127 #elif defined(AFS_LINUX20_ENV) && defined(KERNEL)
 128 #include <asm/atomic.h>
 129
 130 typedef atomic_t rx_atomic_t;
 131
 132 #define rx_atomic_set(X)          atomic_set(X)
 133 #define rx_atomic_read(X)         atomic_read(X)
 134 #define rx_atomic_inc(X)          atomic_inc(X)
 135 #define rx_atomic_inc_and_read(X) atomic_inc_return(X)
 136 #define rx_atomic_add(X, V)       atomic_add(V, X)
 137 #define rx_atomic_dec(X)          atomic_dec(X)
 138 #define rx_atomic_sub(X, V)       atomic_sub(V, X)
 139
 140 #elif defined(AFS_SUN510_ENV) || (defined(AFS_SUN58_ENV) && defined(KERNEL) && !defined(UKERNEL))
 141
 142 # if defined(KERNEL) && !defined(UKERNEL)
 143 #  include <sys/atomic.h>
 144 # else
 145 #  include <atomic.h>
 146 # endif
 147
 148 typedef struct {
 149     volatile unsigned int var;
 150 } rx_atomic_t;
 151
 152 static_inline void
 153 rx_atomic_set(rx_atomic_t *atomic, int val) {
 154     atomic->var = val;
 155 }
 156
 157 static_inline int
 158 rx_atomic_read(rx_atomic_t *atomic) {
 159     return atomic->var;
 160 }
 161
 162 static_inline void
 163 rx_atomic_inc(rx_atomic_t *atomic) {
 164     atomic_inc_32(&atomic->var);
 165 }
 166
 167 static_inline int
 168 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
 169     return atomic_inc_32_nv(&atomic->var);
 170 }
 171
 172 static_inline void
 173 rx_atomic_add(rx_atomic_t *atomic, int change) {
 174     atomic_add_32(&atomic->var, change);
 175 }
 176
 177 static_inline void
 178 rx_atomic_dec(rx_atomic_t *atomic) {
 179     atomic_dec_32(&atomic->var);
 180 }
 181
 182 static_inline int
 183 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
 184     return atomic_dec_32_nv(&atomic->var);
 185 }
 186
 187 static_inline void
 188 rx_atomic_sub(rx_atomic_t *atomic, int change) {
 189     atomic_add_32(&atomic->var, 0 - change);
 190 }
 191
 192 #elif defined(__GNUC__) && defined(HAVE_SYNC_FETCH_AND_ADD)
 193
 194 typedef struct {
 195    volatile int var;
 196 } rx_atomic_t;
 197
 198 static_inline void
 199 rx_atomic_set(rx_atomic_t *atomic, int val) {
 200     atomic->var = val;
 201 }
 202
 203 static_inline int
 204 rx_atomic_read(rx_atomic_t *atomic) {
 205     return atomic->var;
 206 }
 207
 208 static_inline void
 209 rx_atomic_inc(rx_atomic_t *atomic) {
 210     (void)__sync_fetch_and_add(&atomic->var, 1);
 211 }
 212
 213 static_inline int
 214 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
 215     return __sync_add_and_fetch(&atomic->var, 1);
 216 }
 217
 218 static_inline void
 219 rx_atomic_add(rx_atomic_t *atomic, int change) {
 220     (void)__sync_fetch_and_add(&atomic->var, change);
 221 }
 222
 223 static_inline void
 224 rx_atomic_dec(rx_atomic_t *atomic) {
 225     (void)__sync_fetch_and_sub(&atomic->var, 1);
 226 }
 227
 228 static_inline int
 229 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
 230     return __sync_sub_and_fetch(&atomic->var, 1);
 231 }
 232
 233 static_inline void
 234 rx_atomic_sub(rx_atomic_t *atomic, int change) {
 235     (void)__sync_fetch_and_sub(&atomic->var, change);
 236 }
 237
 238 #else
 239
 240 /* If we're on a platform where we have no idea how to do atomics,
 241  * then we fall back to using a single process wide mutex to protect
 242  * all atomic variables. This won't be the quickest thing ever.
 243  */
 244
 245 #ifdef RX_ENABLE_LOCKS
 246 extern afs_kmutex_t rx_atomic_mutex;
 247 #endif
 248
 249 typedef struct {
 250     int var;
 251 } rx_atomic_t;
 252
 253 static_inline void
 254 rx_atomic_set(rx_atomic_t *atomic, int val) {
 255     MUTEX_ENTER(&rx_atomic_mutex);
 256     atomic->var = val;
 257     MUTEX_EXIT(&rx_atomic_mutex);
 258 }
 259
 260 static_inline int
 261 rx_atomic_read(rx_atomic_t *atomic) {
 262     int out;
 263
 264     MUTEX_ENTER(&rx_atomic_mutex);
 265     out = atomic->var;
 266     MUTEX_EXIT(&rx_atomic_mutex);
 267
 268     return out;
 269 }
 270
 271 static_inline void
 272 rx_atomic_inc(rx_atomic_t *atomic) {
 273    MUTEX_ENTER(&rx_atomic_mutex);
 274    atomic->var++;
 275    MUTEX_EXIT(&rx_atomic_mutex);
 276 }
 277
 278 static_inline int
 279 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
 280     int retval;
 281     MUTEX_ENTER(&rx_atomic_mutex);
 282     atomic->var++;
 283     retval = atomic->var;
 284     MUTEX_EXIT(&rx_atomic_mutex);
 285     return retval;
 286 }
 287
 288 static_inline void
 289 rx_atomic_add(rx_atomic_t *atomic, int change) {
 290     MUTEX_ENTER(&rx_atomic_mutex);
 291     atomic->var += change;
 292     MUTEX_EXIT(&rx_atomic_mutex);
 293 }
 294
 295 static_inline void
 296 rx_atomic_dec(rx_atomic_t *atomic) {
 297     MUTEX_ENTER(&rx_atomic_mutex);
 298     atomic->var--;
 299     MUTEX_EXIT(&rx_atomic_mutex);
 300 }
 301
 302 static_inline int
 303 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
 304     int retval;
 305     MUTEX_ENTER(&rx_atomic_mutex);
 306     atomic->var--;
 307     retval = atomic->var;
 308     MUTEX_EXIT(&rx_atomic_mutex);
 309     return retval;
 310 }
 311
 312
 313 static_inline void
 314 rx_atomic_sub(rx_atomic_t *atomic, int change) {
 315     MUTEX_ENTER(&rx_atomic_mutex);
 316     atomic->var -= change;
 317     MUTEX_EXIT(&rx_atomic_mutex);
 318 }
 319
 320 #endif
 321
 322 #endif