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8760d94e PB |
1 | #ifndef _URCU_UATOMIC_GENERIC_H |
2 | #define _URCU_UATOMIC_GENERIC_H | |
3 | ||
4 | /* | |
5 | * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. | |
6 | * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved. | |
7 | * Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P. | |
8 | * Copyright (c) 2009 Mathieu Desnoyers | |
9 | * Copyright (c) 2010 Paolo Bonzini | |
10 | * | |
11 | * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED | |
12 | * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. | |
13 | * | |
14 | * Permission is hereby granted to use or copy this program | |
15 | * for any purpose, provided the above notices are retained on all copies. | |
16 | * Permission to modify the code and to distribute modified code is granted, | |
17 | * provided the above notices are retained, and a notice that the code was | |
18 | * modified is included with the above copyright notice. | |
19 | * | |
20 | * Code inspired from libuatomic_ops-1.2, inherited in part from the | |
21 | * Boehm-Demers-Weiser conservative garbage collector. | |
22 | */ | |
23 | ||
24 | #include <urcu/compiler.h> | |
25 | #include <urcu/system.h> | |
26 | ||
27 | #ifdef __cplusplus | |
28 | extern "C" { | |
29 | #endif | |
30 | ||
8760d94e | 31 | #ifndef uatomic_set |
6cf3827c | 32 | #define uatomic_set(addr, v) CMM_STORE_SHARED(*(addr), (v)) |
8760d94e PB |
33 | #endif |
34 | ||
35 | #ifndef uatomic_read | |
6cf3827c | 36 | #define uatomic_read(addr) CMM_LOAD_SHARED(*(addr)) |
8760d94e PB |
37 | #endif |
38 | ||
39 | #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR | |
40 | static inline __attribute__((always_inline)) | |
41 | void _uatomic_link_error() | |
42 | { | |
43 | #ifdef ILLEGAL_INSTR | |
44 | /* generate an illegal instruction. Cannot catch this with linker tricks | |
45 | * when optimizations are disabled. */ | |
46 | __asm__ __volatile__(ILLEGAL_INSTR); | |
47 | #else | |
48 | __builtin_trap (); | |
49 | #endif | |
50 | } | |
51 | ||
52 | #else /* #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR */ | |
53 | extern void _uatomic_link_error (); | |
54 | #endif /* #else #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR */ | |
55 | ||
56 | /* cmpxchg */ | |
57 | ||
58 | #ifndef uatomic_cmpxchg | |
59 | static inline __attribute__((always_inline)) | |
60 | unsigned long _uatomic_cmpxchg(void *addr, unsigned long old, | |
61 | unsigned long _new, int len) | |
62 | { | |
63 | switch (len) { | |
f469d839 PB |
64 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
65 | case 1: | |
66 | return __sync_val_compare_and_swap_1(addr, old, _new); | |
67 | #endif | |
68 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
69 | case 2: | |
70 | return __sync_val_compare_and_swap_2(addr, old, _new); | |
71 | #endif | |
8760d94e PB |
72 | case 4: |
73 | return __sync_val_compare_and_swap_4(addr, old, _new); | |
b39e1761 | 74 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
75 | case 8: |
76 | return __sync_val_compare_and_swap_8(addr, old, _new); | |
77 | #endif | |
78 | } | |
79 | _uatomic_link_error(); | |
80 | return 0; | |
81 | } | |
82 | ||
83 | ||
84 | #define uatomic_cmpxchg(addr, old, _new) \ | |
85 | ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), (unsigned long)(old),\ | |
86 | (unsigned long)(_new), \ | |
87 | sizeof(*(addr)))) | |
88 | ||
89 | ||
985b35b1 PB |
90 | /* uatomic_or */ |
91 | ||
92 | #ifndef uatomic_or | |
93 | static inline __attribute__((always_inline)) | |
94 | void _uatomic_or(void *addr, unsigned long val, | |
95 | int len) | |
96 | { | |
97 | switch (len) { | |
98 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
99 | case 1: | |
100 | __sync_or_and_fetch_1(addr, val); | |
101 | #endif | |
102 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
103 | case 2: | |
104 | __sync_or_and_fetch_2(addr, val); | |
105 | #endif | |
106 | case 4: | |
107 | __sync_or_and_fetch_4(addr, val); | |
108 | #if (CAA_BITS_PER_LONG == 64) | |
109 | case 8: | |
110 | __sync_or_and_fetch_8(addr, val); | |
111 | #endif | |
112 | } | |
113 | _uatomic_link_error(); | |
114 | return 0; | |
115 | } | |
116 | ||
117 | #define uatomic_or(addr, v) \ | |
118 | (_uatomic_or((addr), \ | |
119 | (unsigned long)(v), \ | |
120 | sizeof(*(addr)))) | |
121 | #endif | |
122 | ||
8760d94e PB |
123 | /* uatomic_add_return */ |
124 | ||
125 | #ifndef uatomic_add_return | |
126 | static inline __attribute__((always_inline)) | |
127 | unsigned long _uatomic_add_return(void *addr, unsigned long val, | |
128 | int len) | |
129 | { | |
130 | switch (len) { | |
f469d839 PB |
131 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
132 | case 1: | |
133 | return __sync_add_and_fetch_1(addr, val); | |
134 | #endif | |
135 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
136 | case 2: | |
137 | return __sync_add_and_fetch_2(addr, val); | |
138 | #endif | |
8760d94e PB |
139 | case 4: |
140 | return __sync_add_and_fetch_4(addr, val); | |
b39e1761 | 141 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
142 | case 8: |
143 | return __sync_add_and_fetch_8(addr, val); | |
144 | #endif | |
145 | } | |
146 | _uatomic_link_error(); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | ||
151 | #define uatomic_add_return(addr, v) \ | |
152 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
153 | (unsigned long)(v), \ | |
154 | sizeof(*(addr)))) | |
155 | #endif /* #ifndef uatomic_add_return */ | |
156 | ||
157 | #ifndef uatomic_xchg | |
158 | /* xchg */ | |
159 | ||
160 | static inline __attribute__((always_inline)) | |
161 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) | |
162 | { | |
163 | switch (len) { | |
f469d839 PB |
164 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
165 | case 1: | |
166 | { | |
167 | unsigned char old; | |
168 | ||
169 | do { | |
170 | old = uatomic_read((unsigned char *)addr); | |
171 | } while (!__sync_bool_compare_and_swap_1(addr, old, val)); | |
172 | ||
173 | return old; | |
174 | } | |
175 | #endif | |
176 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
177 | case 2: | |
178 | { | |
179 | unsigned short old; | |
180 | ||
181 | do { | |
182 | old = uatomic_read((unsigned short *)addr); | |
183 | } while (!__sync_bool_compare_and_swap_2(addr, old, val)); | |
184 | ||
185 | return old; | |
186 | } | |
187 | #endif | |
8760d94e PB |
188 | case 4: |
189 | { | |
190 | unsigned int old; | |
191 | ||
192 | do { | |
193 | old = uatomic_read((unsigned int *)addr); | |
2f2908d0 | 194 | } while (!__sync_bool_compare_and_swap_4(addr, old, val)); |
8760d94e | 195 | |
2f2908d0 | 196 | return old; |
8760d94e | 197 | } |
b39e1761 | 198 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
199 | case 8: |
200 | { | |
201 | unsigned long old; | |
202 | ||
203 | do { | |
204 | old = uatomic_read((unsigned long *)addr); | |
205 | } while (!__sync_bool_compare_and_swap_8(addr, old, val)); | |
206 | ||
207 | return old; | |
208 | } | |
209 | #endif | |
210 | } | |
211 | _uatomic_link_error(); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | #define uatomic_xchg(addr, v) \ | |
216 | ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ | |
217 | sizeof(*(addr)))) | |
218 | #endif /* #ifndef uatomic_xchg */ | |
219 | ||
220 | #else /* #ifndef uatomic_cmpxchg */ | |
221 | ||
985b35b1 PB |
222 | #ifndef uatomic_or |
223 | /* uatomic_or */ | |
224 | ||
225 | static inline __attribute__((always_inline)) | |
226 | void _uatomic_or(void *addr, unsigned long val, int len) | |
227 | { | |
228 | switch (len) { | |
229 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
230 | case 1: | |
231 | { | |
232 | unsigned char old, oldt; | |
233 | ||
234 | oldt = uatomic_read((unsigned char *)addr); | |
235 | do { | |
236 | old = oldt; | |
237 | oldt = _uatomic_cmpxchg(addr, old, old | val, 1); | |
238 | } while (oldt != old); | |
239 | } | |
240 | #endif | |
241 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
242 | case 2: | |
243 | { | |
244 | unsigned short old, oldt; | |
245 | ||
246 | oldt = uatomic_read((unsigned short *)addr); | |
247 | do { | |
248 | old = oldt; | |
249 | oldt = _uatomic_cmpxchg(addr, old, old | val, 2); | |
250 | } while (oldt != old); | |
251 | } | |
252 | #endif | |
253 | case 4: | |
254 | { | |
255 | unsigned int old, oldt; | |
256 | ||
257 | oldt = uatomic_read((unsigned int *)addr); | |
258 | do { | |
259 | old = oldt; | |
260 | oldt = _uatomic_cmpxchg(addr, old, old | val, 4); | |
261 | } while (oldt != old); | |
262 | } | |
263 | #if (CAA_BITS_PER_LONG == 64) | |
264 | case 8: | |
265 | { | |
266 | unsigned long old, oldt; | |
267 | ||
268 | oldt = uatomic_read((unsigned long *)addr); | |
269 | do { | |
270 | old = oldt; | |
271 | oldt = _uatomic_cmpxchg(addr, old, old | val, 8); | |
272 | } while (oldt != old); | |
273 | } | |
274 | #endif | |
275 | } | |
276 | _uatomic_link_error(); | |
277 | return 0; | |
278 | } | |
279 | ||
280 | #define uatomic_or(addr, v) \ | |
281 | (uatomic_or((addr), \ | |
282 | (unsigned long)(v), \ | |
283 | sizeof(*(addr)))) | |
284 | #endif /* #ifndef uatomic_or */ | |
285 | ||
8760d94e PB |
286 | #ifndef uatomic_add_return |
287 | /* uatomic_add_return */ | |
288 | ||
289 | static inline __attribute__((always_inline)) | |
290 | unsigned long _uatomic_add_return(void *addr, unsigned long val, int len) | |
291 | { | |
292 | switch (len) { | |
f469d839 PB |
293 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
294 | case 1: | |
295 | { | |
296 | unsigned char old, oldt; | |
297 | ||
298 | oldt = uatomic_read((unsigned char *)addr); | |
299 | do { | |
300 | old = oldt; | |
301 | oldt = _uatomic_cmpxchg(addr, old, old + val, 1); | |
302 | } while (oldt != old); | |
303 | ||
304 | return old + val; | |
305 | } | |
306 | #endif | |
307 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
308 | case 2: | |
309 | { | |
310 | unsigned short old, oldt; | |
311 | ||
312 | oldt = uatomic_read((unsigned short *)addr); | |
313 | do { | |
314 | old = oldt; | |
315 | oldt = _uatomic_cmpxchg(addr, old, old + val, 2); | |
316 | } while (oldt != old); | |
317 | ||
318 | return old + val; | |
319 | } | |
320 | #endif | |
8760d94e PB |
321 | case 4: |
322 | { | |
323 | unsigned int old, oldt; | |
324 | ||
325 | oldt = uatomic_read((unsigned int *)addr); | |
326 | do { | |
327 | old = oldt; | |
328 | oldt = _uatomic_cmpxchg(addr, old, old + val, 4); | |
329 | } while (oldt != old); | |
330 | ||
331 | return old + val; | |
332 | } | |
b39e1761 | 333 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
334 | case 8: |
335 | { | |
336 | unsigned long old, oldt; | |
337 | ||
338 | oldt = uatomic_read((unsigned long *)addr); | |
339 | do { | |
340 | old = oldt; | |
341 | oldt = _uatomic_cmpxchg(addr, old, old + val, 8); | |
342 | } while (oldt != old); | |
343 | ||
344 | return old + val; | |
345 | } | |
346 | #endif | |
347 | } | |
348 | _uatomic_link_error(); | |
349 | return 0; | |
350 | } | |
351 | ||
352 | #define uatomic_add_return(addr, v) \ | |
353 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
354 | (unsigned long)(v), \ | |
355 | sizeof(*(addr)))) | |
356 | #endif /* #ifndef uatomic_add_return */ | |
357 | ||
358 | #ifndef uatomic_xchg | |
359 | /* xchg */ | |
360 | ||
361 | static inline __attribute__((always_inline)) | |
362 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) | |
363 | { | |
364 | switch (len) { | |
f469d839 PB |
365 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
366 | case 1: | |
367 | { | |
368 | unsigned char old, oldt; | |
369 | ||
370 | oldt = uatomic_read((unsigned char *)addr); | |
371 | do { | |
372 | old = oldt; | |
373 | oldt = _uatomic_cmpxchg(addr, old, val, 1); | |
374 | } while (oldt != old); | |
375 | ||
376 | return old; | |
377 | } | |
378 | #endif | |
379 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
380 | case 2: | |
381 | { | |
382 | unsigned short old, oldt; | |
383 | ||
384 | oldt = uatomic_read((unsigned short *)addr); | |
385 | do { | |
386 | old = oldt; | |
387 | oldt = _uatomic_cmpxchg(addr, old, val, 2); | |
388 | } while (oldt != old); | |
389 | ||
390 | return old; | |
391 | } | |
392 | #endif | |
8760d94e PB |
393 | case 4: |
394 | { | |
395 | unsigned int old, oldt; | |
396 | ||
397 | oldt = uatomic_read((unsigned int *)addr); | |
398 | do { | |
399 | old = oldt; | |
400 | oldt = _uatomic_cmpxchg(addr, old, val, 4); | |
401 | } while (oldt != old); | |
402 | ||
403 | return old; | |
404 | } | |
b39e1761 | 405 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
406 | case 8: |
407 | { | |
408 | unsigned long old, oldt; | |
409 | ||
410 | oldt = uatomic_read((unsigned long *)addr); | |
411 | do { | |
412 | old = oldt; | |
413 | oldt = _uatomic_cmpxchg(addr, old, val, 8); | |
414 | } while (oldt != old); | |
415 | ||
416 | return old; | |
417 | } | |
418 | #endif | |
419 | } | |
420 | _uatomic_link_error(); | |
421 | return 0; | |
422 | } | |
423 | ||
424 | #define uatomic_xchg(addr, v) \ | |
425 | ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ | |
426 | sizeof(*(addr)))) | |
427 | #endif /* #ifndef uatomic_xchg */ | |
428 | ||
429 | #endif /* #else #ifndef uatomic_cmpxchg */ | |
430 | ||
431 | /* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */ | |
432 | ||
433 | #ifndef uatomic_add | |
434 | #define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v)) | |
435 | #endif | |
436 | ||
437 | #define uatomic_sub_return(addr, v) uatomic_add_return((addr), -(v)) | |
438 | #define uatomic_sub(addr, v) uatomic_add((addr), -(v)) | |
439 | ||
440 | #ifndef uatomic_inc | |
441 | #define uatomic_inc(addr) uatomic_add((addr), 1) | |
442 | #endif | |
443 | ||
444 | #ifndef uatomic_dec | |
445 | #define uatomic_dec(addr) uatomic_add((addr), -1) | |
446 | #endif | |
447 | ||
448 | #ifdef __cplusplus | |
449 | } | |
450 | #endif | |
451 | ||
452 | #endif /* _URCU_UATOMIC_GENERIC_H */ |