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_dec(rx_atomic_t *atomic) {
62 InterlockedDecrement(&atomic->var);
66 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
67 return InterlockedDecrement(&atomic->var);
71 rx_atomic_sub(rx_atomic_t *atomic, int change) {
72 InterlockedExchangeAdd(&atomic->var, 0 - change);
75 #elif defined(AFS_DARWIN80_ENV) || defined(AFS_USR_DARWIN80_ENV)
77 #include <libkern/OSAtomic.h>
78 #if defined(KERNEL) && !defined(UKERNEL)
79 #define OSAtomicIncrement32 OSIncrementAtomic
80 #define OSAtomicAdd32 OSAddAtomic
81 #define OSAtomicDecrement32 OSDecrementAtomic
89 rx_atomic_set(rx_atomic_t *atomic, int val) {
94 rx_atomic_read(rx_atomic_t *atomic) {
99 rx_atomic_inc(rx_atomic_t *atomic) {
100 OSAtomicIncrement32(&atomic->var);
104 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
105 return OSAtomicIncrement32(&atomic->var);
109 rx_atomic_add(rx_atomic_t *atomic, int change) {
110 OSAtomicAdd32(change, &atomic->var);
114 rx_atomic_dec(rx_atomic_t *atomic) {
115 OSAtomicDecrement32(&atomic->var);
119 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
120 return OSAtomicDecrement32(&atomic->var);
124 rx_atomic_sub(rx_atomic_t *atomic, int change) {
125 OSAtomicAdd32(0 - change, &atomic->var);
127 #elif defined(AFS_LINUX20_ENV) && defined(KERNEL)
128 #include <asm/atomic.h>
130 typedef atomic_t rx_atomic_t;
132 #define rx_atomic_set(X, V) atomic_set(X, V)
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_dec_and_read(X) atomic_dec_return(X)
139 #define rx_atomic_sub(X, V) atomic_sub(V, X)
141 #elif defined(AFS_SUN510_ENV) || (defined(AFS_SUN58_ENV) && defined(KERNEL) && !defined(UKERNEL))
143 # if defined(KERNEL) && !defined(UKERNEL)
144 # include <sys/atomic.h>
149 #ifndef AFS_SUN510_ENV
150 # define atomic_inc_32(X) atomic_add_32((X), 1)
151 # define atomic_inc_32_nv(X) atomic_add_32_nv((X), 1)
152 # define atomic_dec_32(X) atomic_add_32((X), -1)
153 # define atomic_dec_32_nv(X) atomic_add_32_nv((X), -1)
157 volatile unsigned int var;
161 rx_atomic_set(rx_atomic_t *atomic, int val) {
166 rx_atomic_read(rx_atomic_t *atomic) {
171 rx_atomic_inc(rx_atomic_t *atomic) {
172 atomic_inc_32(&atomic->var);
176 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
177 return atomic_inc_32_nv(&atomic->var);
181 rx_atomic_add(rx_atomic_t *atomic, int change) {
182 atomic_add_32(&atomic->var, change);
186 rx_atomic_dec(rx_atomic_t *atomic) {
187 atomic_dec_32(&atomic->var);
191 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
192 return atomic_dec_32_nv(&atomic->var);
196 rx_atomic_sub(rx_atomic_t *atomic, int change) {
197 atomic_add_32(&atomic->var, 0 - change);
200 #elif defined(__GNUC__) && defined(HAVE_SYNC_FETCH_AND_ADD)
207 rx_atomic_set(rx_atomic_t *atomic, int val) {
212 rx_atomic_read(rx_atomic_t *atomic) {
217 rx_atomic_inc(rx_atomic_t *atomic) {
218 (void)__sync_fetch_and_add(&atomic->var, 1);
222 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
223 return __sync_add_and_fetch(&atomic->var, 1);
227 rx_atomic_add(rx_atomic_t *atomic, int change) {
228 (void)__sync_fetch_and_add(&atomic->var, change);
232 rx_atomic_dec(rx_atomic_t *atomic) {
233 (void)__sync_fetch_and_sub(&atomic->var, 1);
237 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
238 return __sync_sub_and_fetch(&atomic->var, 1);
242 rx_atomic_sub(rx_atomic_t *atomic, int change) {
243 (void)__sync_fetch_and_sub(&atomic->var, change);
248 /* If we're on a platform where we have no idea how to do atomics,
249 * then we fall back to using a single process wide mutex to protect
250 * all atomic variables. This won't be the quickest thing ever.
253 #ifdef RX_ENABLE_LOCKS
254 extern afs_kmutex_t rx_atomic_mutex;
262 rx_atomic_set(rx_atomic_t *atomic, int val) {
263 MUTEX_ENTER(&rx_atomic_mutex);
265 MUTEX_EXIT(&rx_atomic_mutex);
269 rx_atomic_read(rx_atomic_t *atomic) {
272 MUTEX_ENTER(&rx_atomic_mutex);
274 MUTEX_EXIT(&rx_atomic_mutex);
280 rx_atomic_inc(rx_atomic_t *atomic) {
281 MUTEX_ENTER(&rx_atomic_mutex);
283 MUTEX_EXIT(&rx_atomic_mutex);
287 rx_atomic_inc_and_read(rx_atomic_t *atomic) {
289 MUTEX_ENTER(&rx_atomic_mutex);
291 retval = atomic->var;
292 MUTEX_EXIT(&rx_atomic_mutex);
297 rx_atomic_add(rx_atomic_t *atomic, int change) {
298 MUTEX_ENTER(&rx_atomic_mutex);
299 atomic->var += change;
300 MUTEX_EXIT(&rx_atomic_mutex);
304 rx_atomic_dec(rx_atomic_t *atomic) {
305 MUTEX_ENTER(&rx_atomic_mutex);
307 MUTEX_EXIT(&rx_atomic_mutex);
311 rx_atomic_dec_and_read(rx_atomic_t *atomic) {
313 MUTEX_ENTER(&rx_atomic_mutex);
315 retval = atomic->var;
316 MUTEX_EXIT(&rx_atomic_mutex);
322 rx_atomic_sub(rx_atomic_t *atomic, int change) {
323 MUTEX_ENTER(&rx_atomic_mutex);
324 atomic->var -= change;
325 MUTEX_EXIT(&rx_atomic_mutex);