2 * Copyright (c) 2010 Your Filesystem Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
25 #ifndef OPENAFS_RX_ATOMIC_H
26 #define OPENAFS_RX_ATOMIC_H 1
28 #define RX_ATOMIC_INIT(i) { (i) }
36 rx_atomic_set(rx_atomic_t *atomic, int val) {
41 rx_atomic_read(rx_atomic_t *atomic) {
46 rx_atomic_inc(rx_atomic_t *atomic) {
47 InterlockedIncrement(&atomic->var);
51 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
52 return InterlockedIncrement(&atomic->var);
56 rx_atomic_add(rx_atomic_t *atomic, int change) {
57 InterlockedExchangeAdd(&atomic->var, change);
61 rx_atomic_add_and_read(rx_atomic_t *atomic, int change) {
62 return InterlockedExchangeAdd(&atomic->var, change) + change;
66 rx_atomic_dec(rx_atomic_t *atomic) {
67 InterlockedDecrement(&atomic->var);
71 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
72 return InterlockedDecrement(&atomic->var);
76 rx_atomic_sub(rx_atomic_t *atomic, int change) {
77 InterlockedExchangeAdd(&atomic->var, 0 - change);
81 rx_atomic_test_bit(rx_atomic_t *atomic, int bit) {
82 return ((unsigned int) rx_atomic_read(atomic) & 1<<bit) != 0;
85 /* No InterlockedOr or InterlockedAnd on ix86, so just use the
86 * BitTest functions */
89 rx_atomic_set_bit(rx_atomic_t *atomic, int bit) {
90 (void) InterlockedBitTestAndSet(&atomic->var, bit);
94 rx_atomic_clear_bit(rx_atomic_t *atomic, int bit) {
95 (void) InterlockedBitTestAndReset(&atomic->var, bit);
99 rx_atomic_test_and_set_bit(rx_atomic_t *atomic, int bit) {
100 return InterlockedBitTestAndSet(&atomic->var, bit);
104 rx_atomic_test_and_clear_bit(rx_atomic_t *atomic, int bit) {
105 return InterlockedBitTestAndReset(&atomic->var, bit);
108 #elif defined(AFS_AIX61_ENV) || defined(AFS_USR_AIX61_ENV)
109 #include <sys/atomic_op.h>
116 rx_atomic_set(rx_atomic_t *atomic, int val) {
121 rx_atomic_read(rx_atomic_t *atomic) {
126 rx_atomic_inc(rx_atomic_t *atomic) {
127 fetch_and_add(&atomic->var, 1);
131 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
132 return (fetch_and_add(&atomic->var, 1) + 1);
136 rx_atomic_add(rx_atomic_t *atomic, int change) {
137 fetch_and_add(&atomic->var, change);
141 rx_atomic_add_and_read(rx_atomic_t *atomic, int change) {
142 return (fetch_and_add(&atomic->var, change) + change);
146 rx_atomic_dec(rx_atomic_t *atomic) {
147 fetch_and_add(&atomic->var, -1);
151 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
152 return (fetch_and_add(&atomic->var, -1) - 1);
156 rx_atomic_sub(rx_atomic_t *atomic, int change) {
157 fetch_and_add(&atomic->var, -change);
161 rx_atomic_test_bit(rx_atomic_t *atomic, int bit) {
162 return ((unsigned int) rx_atomic_read(atomic) & 1<<bit) != 0;
166 rx_atomic_set_bit(rx_atomic_t *atomic, int bit) {
167 fetch_and_or(&atomic->var, 1<<bit);
171 rx_atomic_clear_bit(rx_atomic_t *atomic, int bit) {
172 fetch_and_and(&atomic->var, ~(1<<bit));
176 rx_atomic_test_and_set_bit(rx_atomic_t *atomic, int bit) {
177 return (fetch_and_or(&atomic->var, (1<<bit)) & 1<<bit) != 0;
181 rx_atomic_test_and_clear_bit(rx_atomic_t *atomic, int bit) {
182 return (fetch_and_and(&atomic->var, ~(1<<bit)) & 1<<bit) != 0;
185 #elif defined(AFS_DARWIN80_ENV) || defined(AFS_USR_DARWIN80_ENV)
187 # if defined (AFS_DARWIN160_ENV) || defined(AFS_USR_DARWIN160_ENV)
188 # define OSATOMIC_USE_INLINED 1
191 # if defined(KERNEL) && !defined(UKERNEL)
192 # define OSAtomicIncrement32 OSIncrementAtomic
193 # define OSAtomicAdd32 OSAddAtomic
194 # define OSAtomicDecrement32 OSDecrementAtomic
195 # define OSAtomicOr32 OSBitOrAtomic
196 # define OSAtomicAnd32 OSBitAndAtomic
199 # endif /* end defined DARWIN160 */
201 # include <libkern/OSAtomic.h>
208 rx_atomic_set(rx_atomic_t *atomic, int val) {
213 rx_atomic_read(rx_atomic_t *atomic) {
218 rx_atomic_inc(rx_atomic_t *atomic) {
219 OSAtomicIncrement32(&atomic->var);
223 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
224 return OSAtomicIncrement32(&atomic->var);
228 rx_atomic_add(rx_atomic_t *atomic, int change) {
229 OSAtomicAdd32(change, &atomic->var);
233 rx_atomic_add_and_read(rx_atomic_t *atomic, int change) {
234 return OSAtomicAdd32(change, &atomic->var);
238 rx_atomic_dec(rx_atomic_t *atomic) {
239 OSAtomicDecrement32(&atomic->var);
243 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
244 return OSAtomicDecrement32(&atomic->var);
248 rx_atomic_sub(rx_atomic_t *atomic, int change) {
249 OSAtomicAdd32(0 - change, &atomic->var);
253 rx_atomic_test_bit(rx_atomic_t *atomic, int bit) {
254 return ((unsigned int) rx_atomic_read(atomic) & 1<<bit) != 0;
258 rx_atomic_set_bit(rx_atomic_t *atomic, int bit) {
259 OSAtomicOr32(1<<bit, (volatile uint32_t *)&atomic->var);
263 rx_atomic_clear_bit(rx_atomic_t *atomic, int bit) {
264 OSAtomicAnd32(~(1<<bit), (volatile uint32_t *)&atomic->var);
268 rx_atomic_test_and_set_bit(rx_atomic_t *atomic, int bit) {
269 return ((OSAtomicOr32Orig(1<<bit, (volatile uint32_t *)&atomic->var) & 1<<bit)
274 rx_atomic_test_and_clear_bit(rx_atomic_t *atomic, int bit) {
275 return ((OSAtomicAnd32Orig(~(1<<bit),
276 (volatile uint32_t *)&atomic->var) & 1<<bit)
280 #elif defined(AFS_LINUX26_ENV) && defined(KERNEL)
281 #include <asm/atomic.h>
283 typedef atomic_t rx_atomic_t;
285 #define rx_atomic_set(X, V) atomic_set(X, V)
286 #define rx_atomic_read(X) atomic_read(X)
287 #define rx_atomic_inc(X) atomic_inc(X)
288 #define rx_atomic_inc_and_read(X) atomic_inc_return(X)
289 #define rx_atomic_add(X, V) atomic_add(V, X)
290 #define rx_atomic_add_and_read(X, V) atomic_add_return(V, X)
291 #define rx_atomic_dec(X) atomic_dec(X)
292 #define rx_atomic_dec_and_read(X) atomic_dec_return(X)
293 #define rx_atomic_sub(X, V) atomic_sub(V, X)
294 #define rx_atomic_test_bit(X, B) test_bit(B, (unsigned long *) &(X)->counter)
295 #define rx_atomic_set_bit(X, B) set_bit(B, (unsigned long *) &(X)->counter)
296 #define rx_atomic_clear_bit(X, B) clear_bit(B, (unsigned long *) &(X)->counter)
297 #define rx_atomic_test_and_set_bit(X, B) test_and_set_bit(B, (unsigned long *) &(X)->counter)
298 #define rx_atomic_test_and_clear_bit(X, B) test_and_clear_bit(B, (unsigned long *) &(X)->counter)
300 #elif defined(AFS_SUN510_ENV) || (defined(AFS_SUN5_ENV) && defined(KERNEL) && !defined(UKERNEL))
302 # if defined(KERNEL) && !defined(UKERNEL)
303 # include <sys/atomic.h>
308 #ifndef AFS_SUN510_ENV
309 # define atomic_inc_32(X) atomic_add_32((X), 1)
310 # define atomic_inc_32_nv(X) atomic_add_32_nv((X), 1)
311 # define atomic_dec_32(X) atomic_add_32((X), -1)
312 # define atomic_dec_32_nv(X) atomic_add_32_nv((X), -1)
316 volatile unsigned int var;
320 rx_atomic_set(rx_atomic_t *atomic, int val) {
325 rx_atomic_read(rx_atomic_t *atomic) {
330 rx_atomic_inc(rx_atomic_t *atomic) {
331 atomic_inc_32(&atomic->var);
335 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
336 return atomic_inc_32_nv(&atomic->var);
340 rx_atomic_add(rx_atomic_t *atomic, int change) {
341 atomic_add_32(&atomic->var, change);
345 rx_atomic_add_and_read(rx_atomic_t *atomic, int change) {
346 return atomic_add_32_nv(&atomic->var, change);
350 rx_atomic_dec(rx_atomic_t *atomic) {
351 atomic_dec_32(&atomic->var);
355 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
356 return atomic_dec_32_nv(&atomic->var);
360 rx_atomic_sub(rx_atomic_t *atomic, int change) {
361 atomic_add_32(&atomic->var, 0 - change);
365 rx_atomic_test_bit(rx_atomic_t *atomic, int bit) {
366 return ((unsigned int) rx_atomic_read(atomic) & 1<<bit) != 0;
370 rx_atomic_set_bit(rx_atomic_t *atomic, int bit) {
371 atomic_or_32(&atomic->var, 1<<bit);
375 rx_atomic_clear_bit(rx_atomic_t *atomic, int bit) {
376 atomic_and_32(&atomic->var, ~(1<<bit));
380 rx_atomic_test_and_set_bit(rx_atomic_t *atomic, int bit) {
381 return (atomic_set_long_excl(&atomic->var, bit) == -1);
385 rx_atomic_test_and_clear_bit(rx_atomic_t *atomic, int bit) {
386 return (atomic_clear_long_excl(&atomic->var, bit) == 0);
389 #elif defined(__GNUC__) && defined(HAVE_SYNC_FETCH_AND_ADD)
396 rx_atomic_set(rx_atomic_t *atomic, int val) {
401 rx_atomic_read(rx_atomic_t *atomic) {
406 rx_atomic_inc(rx_atomic_t *atomic) {
407 (void)__sync_fetch_and_add(&atomic->var, 1);
411 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
412 return __sync_add_and_fetch(&atomic->var, 1);
416 rx_atomic_add(rx_atomic_t *atomic, int change) {
417 (void)__sync_fetch_and_add(&atomic->var, change);
421 rx_atomic_add_and_read(rx_atomic_t *atomic, int change) {
422 return __sync_fetch_and_add(&atomic->var, change);
426 rx_atomic_dec(rx_atomic_t *atomic) {
427 (void)__sync_fetch_and_sub(&atomic->var, 1);
431 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
432 return __sync_sub_and_fetch(&atomic->var, 1);
436 rx_atomic_sub(rx_atomic_t *atomic, int change) {
437 (void)__sync_fetch_and_sub(&atomic->var, change);
441 rx_atomic_test_bit(rx_atomic_t *atomic, int bit) {
442 return ((unsigned int) rx_atomic_read(atomic) & 1<<bit) != 0;
446 rx_atomic_set_bit(rx_atomic_t *atomic, int bit) {
447 (void)__sync_fetch_and_or(&atomic->var, 1<<bit);
451 rx_atomic_clear_bit(rx_atomic_t *atomic, int bit) {
452 (void)__sync_fetch_and_and(&atomic->var, ~(1<<bit));
456 rx_atomic_test_and_set_bit(rx_atomic_t *atomic, int bit) {
457 return (__sync_fetch_and_or(&atomic->var, 1<<bit) & 1<<bit) != 0;
461 rx_atomic_test_and_clear_bit(rx_atomic_t *atomic, int bit) {
462 return (__sync_fetch_and_and(&atomic->var, ~(1<<bit)) & 1<<bit) != 0;
467 /* If we're on a platform where we have no idea how to do atomics,
468 * then we fall back to using a single process wide mutex to protect
469 * all atomic variables. This won't be the quickest thing ever.
472 #ifdef RX_ENABLE_LOCKS
473 extern afs_kmutex_t rx_atomic_mutex;
481 rx_atomic_set(rx_atomic_t *atomic, int val) {
482 MUTEX_ENTER(&rx_atomic_mutex);
484 MUTEX_EXIT(&rx_atomic_mutex);
488 rx_atomic_read(rx_atomic_t *atomic) {
491 MUTEX_ENTER(&rx_atomic_mutex);
493 MUTEX_EXIT(&rx_atomic_mutex);
499 rx_atomic_inc(rx_atomic_t *atomic) {
500 MUTEX_ENTER(&rx_atomic_mutex);
502 MUTEX_EXIT(&rx_atomic_mutex);
506 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
508 MUTEX_ENTER(&rx_atomic_mutex);
510 retval = atomic->var;
511 MUTEX_EXIT(&rx_atomic_mutex);
516 rx_atomic_add(rx_atomic_t *atomic, int change) {
517 MUTEX_ENTER(&rx_atomic_mutex);
518 atomic->var += change;
519 MUTEX_EXIT(&rx_atomic_mutex);
523 rx_atomic_add_and_read(rx_atomic_t *atomic, int change) {
526 MUTEX_ENTER(&rx_atomic_mutex);
527 atomic->var += change;
528 retval = atomic->var;
529 MUTEX_EXIT(&rx_atomic_mutex);
535 rx_atomic_dec(rx_atomic_t *atomic) {
536 MUTEX_ENTER(&rx_atomic_mutex);
538 MUTEX_EXIT(&rx_atomic_mutex);
542 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
544 MUTEX_ENTER(&rx_atomic_mutex);
546 retval = atomic->var;
547 MUTEX_EXIT(&rx_atomic_mutex);
553 rx_atomic_sub(rx_atomic_t *atomic, int change) {
554 MUTEX_ENTER(&rx_atomic_mutex);
555 atomic->var -= change;
556 MUTEX_EXIT(&rx_atomic_mutex);
560 rx_atomic_test_bit(rx_atomic_t *atomic, int bit) {
561 return ((unsigned int) rx_atomic_read(atomic) & 1<<bit) != 0;
565 rx_atomic_set_bit(rx_atomic_t *atomic, int bit) {
566 MUTEX_ENTER(&rx_atomic_mutex);
567 atomic->var |= (1<<bit);
568 MUTEX_EXIT(&rx_atomic_mutex);
572 rx_atomic_clear_bit(rx_atomic_t *atomic, int bit) {
573 MUTEX_ENTER(&rx_atomic_mutex);
574 atomic->var &= ~(1<<bit);
575 MUTEX_EXIT(&rx_atomic_mutex);
579 rx_atomic_test_and_set_bit(rx_atomic_t *atomic, int bit) {
582 MUTEX_ENTER(&rx_atomic_mutex);
584 atomic->var |= 1<<bit;
585 MUTEX_EXIT(&rx_atomic_mutex);
587 return (val & 1<<bit) == 1<<bit;
591 rx_atomic_test_and_clear_bit(rx_atomic_t *atomic, int bit) {
594 MUTEX_ENTER(&rx_atomic_mutex);
596 atomic->var &= ~(1<<bit);
597 MUTEX_EXIT(&rx_atomic_mutex);
599 return (val & 1<<bit) == 1<<bit;