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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 | ||
bf33aaea PB |
90 | /* uatomic_and */ |
91 | ||
92 | #ifndef uatomic_and | |
93 | static inline __attribute__((always_inline)) | |
94 | void _uatomic_and(void *addr, unsigned long val, | |
95 | int len) | |
96 | { | |
97 | switch (len) { | |
98 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
99 | case 1: | |
100 | __sync_and_and_fetch_1(addr, val); | |
101 | #endif | |
102 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
103 | case 2: | |
104 | __sync_and_and_fetch_2(addr, val); | |
105 | #endif | |
106 | case 4: | |
107 | __sync_and_and_fetch_4(addr, val); | |
108 | #if (CAA_BITS_PER_LONG == 64) | |
109 | case 8: | |
110 | __sync_and_and_fetch_8(addr, val); | |
111 | #endif | |
112 | } | |
113 | _uatomic_link_error(); | |
114 | return 0; | |
115 | } | |
116 | ||
117 | #define uatomic_and(addr, v) \ | |
118 | (_uatomic_and((addr), \ | |
119 | (unsigned long)(v), \ | |
120 | sizeof(*(addr)))) | |
121 | #endif | |
122 | ||
985b35b1 PB |
123 | /* uatomic_or */ |
124 | ||
125 | #ifndef uatomic_or | |
126 | static inline __attribute__((always_inline)) | |
127 | void _uatomic_or(void *addr, unsigned long val, | |
128 | int len) | |
129 | { | |
130 | switch (len) { | |
131 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
132 | case 1: | |
133 | __sync_or_and_fetch_1(addr, val); | |
134 | #endif | |
135 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
136 | case 2: | |
137 | __sync_or_and_fetch_2(addr, val); | |
138 | #endif | |
139 | case 4: | |
140 | __sync_or_and_fetch_4(addr, val); | |
141 | #if (CAA_BITS_PER_LONG == 64) | |
142 | case 8: | |
143 | __sync_or_and_fetch_8(addr, val); | |
144 | #endif | |
145 | } | |
146 | _uatomic_link_error(); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | #define uatomic_or(addr, v) \ | |
151 | (_uatomic_or((addr), \ | |
152 | (unsigned long)(v), \ | |
153 | sizeof(*(addr)))) | |
154 | #endif | |
155 | ||
8760d94e PB |
156 | /* uatomic_add_return */ |
157 | ||
158 | #ifndef uatomic_add_return | |
159 | static inline __attribute__((always_inline)) | |
160 | unsigned long _uatomic_add_return(void *addr, unsigned long val, | |
161 | int len) | |
162 | { | |
163 | switch (len) { | |
f469d839 PB |
164 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
165 | case 1: | |
166 | return __sync_add_and_fetch_1(addr, val); | |
167 | #endif | |
168 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
169 | case 2: | |
170 | return __sync_add_and_fetch_2(addr, val); | |
171 | #endif | |
8760d94e PB |
172 | case 4: |
173 | return __sync_add_and_fetch_4(addr, val); | |
b39e1761 | 174 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
175 | case 8: |
176 | return __sync_add_and_fetch_8(addr, val); | |
177 | #endif | |
178 | } | |
179 | _uatomic_link_error(); | |
180 | return 0; | |
181 | } | |
182 | ||
183 | ||
184 | #define uatomic_add_return(addr, v) \ | |
185 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
186 | (unsigned long)(v), \ | |
187 | sizeof(*(addr)))) | |
188 | #endif /* #ifndef uatomic_add_return */ | |
189 | ||
190 | #ifndef uatomic_xchg | |
191 | /* xchg */ | |
192 | ||
193 | static inline __attribute__((always_inline)) | |
194 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) | |
195 | { | |
196 | switch (len) { | |
f469d839 PB |
197 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
198 | case 1: | |
199 | { | |
200 | unsigned char old; | |
201 | ||
202 | do { | |
203 | old = uatomic_read((unsigned char *)addr); | |
204 | } while (!__sync_bool_compare_and_swap_1(addr, old, val)); | |
205 | ||
206 | return old; | |
207 | } | |
208 | #endif | |
209 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
210 | case 2: | |
211 | { | |
212 | unsigned short old; | |
213 | ||
214 | do { | |
215 | old = uatomic_read((unsigned short *)addr); | |
216 | } while (!__sync_bool_compare_and_swap_2(addr, old, val)); | |
217 | ||
218 | return old; | |
219 | } | |
220 | #endif | |
8760d94e PB |
221 | case 4: |
222 | { | |
223 | unsigned int old; | |
224 | ||
225 | do { | |
226 | old = uatomic_read((unsigned int *)addr); | |
2f2908d0 | 227 | } while (!__sync_bool_compare_and_swap_4(addr, old, val)); |
8760d94e | 228 | |
2f2908d0 | 229 | return old; |
8760d94e | 230 | } |
b39e1761 | 231 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
232 | case 8: |
233 | { | |
234 | unsigned long old; | |
235 | ||
236 | do { | |
237 | old = uatomic_read((unsigned long *)addr); | |
238 | } while (!__sync_bool_compare_and_swap_8(addr, old, val)); | |
239 | ||
240 | return old; | |
241 | } | |
242 | #endif | |
243 | } | |
244 | _uatomic_link_error(); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | #define uatomic_xchg(addr, v) \ | |
249 | ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ | |
250 | sizeof(*(addr)))) | |
251 | #endif /* #ifndef uatomic_xchg */ | |
252 | ||
253 | #else /* #ifndef uatomic_cmpxchg */ | |
254 | ||
bf33aaea PB |
255 | #ifndef uatomic_and |
256 | /* uatomic_and */ | |
257 | ||
258 | static inline __attribute__((always_inline)) | |
259 | void _uatomic_and(void *addr, unsigned long val, int len) | |
260 | { | |
261 | switch (len) { | |
262 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
263 | case 1: | |
264 | { | |
265 | unsigned char old, oldt; | |
266 | ||
267 | oldt = uatomic_read((unsigned char *)addr); | |
268 | do { | |
269 | old = oldt; | |
270 | oldt = _uatomic_cmpxchg(addr, old, old & val, 1); | |
271 | } while (oldt != old); | |
272 | } | |
273 | #endif | |
274 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
275 | case 2: | |
276 | { | |
277 | unsigned short old, oldt; | |
278 | ||
279 | oldt = uatomic_read((unsigned short *)addr); | |
280 | do { | |
281 | old = oldt; | |
282 | oldt = _uatomic_cmpxchg(addr, old, old & val, 2); | |
283 | } while (oldt != old); | |
284 | } | |
285 | #endif | |
286 | case 4: | |
287 | { | |
288 | unsigned int old, oldt; | |
289 | ||
290 | oldt = uatomic_read((unsigned int *)addr); | |
291 | do { | |
292 | old = oldt; | |
293 | oldt = _uatomic_cmpxchg(addr, old, old & val, 4); | |
294 | } while (oldt != old); | |
295 | } | |
296 | #if (CAA_BITS_PER_LONG == 64) | |
297 | case 8: | |
298 | { | |
299 | unsigned long old, oldt; | |
300 | ||
301 | oldt = uatomic_read((unsigned long *)addr); | |
302 | do { | |
303 | old = oldt; | |
304 | oldt = _uatomic_cmpxchg(addr, old, old & val, 8); | |
305 | } while (oldt != old); | |
306 | } | |
307 | #endif | |
308 | } | |
309 | _uatomic_link_error(); | |
310 | return 0; | |
311 | } | |
312 | ||
313 | #define uatomic_and(addr, v) \ | |
314 | (uatomic_and((addr), \ | |
315 | (unsigned long)(v), \ | |
316 | sizeof(*(addr)))) | |
317 | #endif /* #ifndef uatomic_and */ | |
318 | ||
985b35b1 PB |
319 | #ifndef uatomic_or |
320 | /* uatomic_or */ | |
321 | ||
322 | static inline __attribute__((always_inline)) | |
323 | void _uatomic_or(void *addr, unsigned long val, int len) | |
324 | { | |
325 | switch (len) { | |
326 | #ifdef UATOMIC_HAS_ATOMIC_BYTE | |
327 | case 1: | |
328 | { | |
329 | unsigned char old, oldt; | |
330 | ||
331 | oldt = uatomic_read((unsigned char *)addr); | |
332 | do { | |
333 | old = oldt; | |
334 | oldt = _uatomic_cmpxchg(addr, old, old | val, 1); | |
335 | } while (oldt != old); | |
336 | } | |
337 | #endif | |
338 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
339 | case 2: | |
340 | { | |
341 | unsigned short old, oldt; | |
342 | ||
343 | oldt = uatomic_read((unsigned short *)addr); | |
344 | do { | |
345 | old = oldt; | |
346 | oldt = _uatomic_cmpxchg(addr, old, old | val, 2); | |
347 | } while (oldt != old); | |
348 | } | |
349 | #endif | |
350 | case 4: | |
351 | { | |
352 | unsigned int old, oldt; | |
353 | ||
354 | oldt = uatomic_read((unsigned int *)addr); | |
355 | do { | |
356 | old = oldt; | |
357 | oldt = _uatomic_cmpxchg(addr, old, old | val, 4); | |
358 | } while (oldt != old); | |
359 | } | |
360 | #if (CAA_BITS_PER_LONG == 64) | |
361 | case 8: | |
362 | { | |
363 | unsigned long old, oldt; | |
364 | ||
365 | oldt = uatomic_read((unsigned long *)addr); | |
366 | do { | |
367 | old = oldt; | |
368 | oldt = _uatomic_cmpxchg(addr, old, old | val, 8); | |
369 | } while (oldt != old); | |
370 | } | |
371 | #endif | |
372 | } | |
373 | _uatomic_link_error(); | |
374 | return 0; | |
375 | } | |
376 | ||
377 | #define uatomic_or(addr, v) \ | |
378 | (uatomic_or((addr), \ | |
379 | (unsigned long)(v), \ | |
380 | sizeof(*(addr)))) | |
381 | #endif /* #ifndef uatomic_or */ | |
382 | ||
8760d94e PB |
383 | #ifndef uatomic_add_return |
384 | /* uatomic_add_return */ | |
385 | ||
386 | static inline __attribute__((always_inline)) | |
387 | unsigned long _uatomic_add_return(void *addr, unsigned long val, int len) | |
388 | { | |
389 | switch (len) { | |
f469d839 PB |
390 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
391 | case 1: | |
392 | { | |
393 | unsigned char old, oldt; | |
394 | ||
395 | oldt = uatomic_read((unsigned char *)addr); | |
396 | do { | |
397 | old = oldt; | |
398 | oldt = _uatomic_cmpxchg(addr, old, old + val, 1); | |
399 | } while (oldt != old); | |
400 | ||
401 | return old + val; | |
402 | } | |
403 | #endif | |
404 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
405 | case 2: | |
406 | { | |
407 | unsigned short old, oldt; | |
408 | ||
409 | oldt = uatomic_read((unsigned short *)addr); | |
410 | do { | |
411 | old = oldt; | |
412 | oldt = _uatomic_cmpxchg(addr, old, old + val, 2); | |
413 | } while (oldt != old); | |
414 | ||
415 | return old + val; | |
416 | } | |
417 | #endif | |
8760d94e PB |
418 | case 4: |
419 | { | |
420 | unsigned int old, oldt; | |
421 | ||
422 | oldt = uatomic_read((unsigned int *)addr); | |
423 | do { | |
424 | old = oldt; | |
425 | oldt = _uatomic_cmpxchg(addr, old, old + val, 4); | |
426 | } while (oldt != old); | |
427 | ||
428 | return old + val; | |
429 | } | |
b39e1761 | 430 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
431 | case 8: |
432 | { | |
433 | unsigned long old, oldt; | |
434 | ||
435 | oldt = uatomic_read((unsigned long *)addr); | |
436 | do { | |
437 | old = oldt; | |
438 | oldt = _uatomic_cmpxchg(addr, old, old + val, 8); | |
439 | } while (oldt != old); | |
440 | ||
441 | return old + val; | |
442 | } | |
443 | #endif | |
444 | } | |
445 | _uatomic_link_error(); | |
446 | return 0; | |
447 | } | |
448 | ||
449 | #define uatomic_add_return(addr, v) \ | |
450 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
451 | (unsigned long)(v), \ | |
452 | sizeof(*(addr)))) | |
453 | #endif /* #ifndef uatomic_add_return */ | |
454 | ||
455 | #ifndef uatomic_xchg | |
456 | /* xchg */ | |
457 | ||
458 | static inline __attribute__((always_inline)) | |
459 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) | |
460 | { | |
461 | switch (len) { | |
f469d839 PB |
462 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
463 | case 1: | |
464 | { | |
465 | unsigned char old, oldt; | |
466 | ||
467 | oldt = uatomic_read((unsigned char *)addr); | |
468 | do { | |
469 | old = oldt; | |
470 | oldt = _uatomic_cmpxchg(addr, old, val, 1); | |
471 | } while (oldt != old); | |
472 | ||
473 | return old; | |
474 | } | |
475 | #endif | |
476 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
477 | case 2: | |
478 | { | |
479 | unsigned short old, oldt; | |
480 | ||
481 | oldt = uatomic_read((unsigned short *)addr); | |
482 | do { | |
483 | old = oldt; | |
484 | oldt = _uatomic_cmpxchg(addr, old, val, 2); | |
485 | } while (oldt != old); | |
486 | ||
487 | return old; | |
488 | } | |
489 | #endif | |
8760d94e PB |
490 | case 4: |
491 | { | |
492 | unsigned int old, oldt; | |
493 | ||
494 | oldt = uatomic_read((unsigned int *)addr); | |
495 | do { | |
496 | old = oldt; | |
497 | oldt = _uatomic_cmpxchg(addr, old, val, 4); | |
498 | } while (oldt != old); | |
499 | ||
500 | return old; | |
501 | } | |
b39e1761 | 502 | #if (CAA_BITS_PER_LONG == 64) |
8760d94e PB |
503 | case 8: |
504 | { | |
505 | unsigned long old, oldt; | |
506 | ||
507 | oldt = uatomic_read((unsigned long *)addr); | |
508 | do { | |
509 | old = oldt; | |
510 | oldt = _uatomic_cmpxchg(addr, old, val, 8); | |
511 | } while (oldt != old); | |
512 | ||
513 | return old; | |
514 | } | |
515 | #endif | |
516 | } | |
517 | _uatomic_link_error(); | |
518 | return 0; | |
519 | } | |
520 | ||
521 | #define uatomic_xchg(addr, v) \ | |
522 | ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ | |
523 | sizeof(*(addr)))) | |
524 | #endif /* #ifndef uatomic_xchg */ | |
525 | ||
526 | #endif /* #else #ifndef uatomic_cmpxchg */ | |
527 | ||
528 | /* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */ | |
529 | ||
530 | #ifndef uatomic_add | |
531 | #define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v)) | |
532 | #endif | |
533 | ||
534 | #define uatomic_sub_return(addr, v) uatomic_add_return((addr), -(v)) | |
535 | #define uatomic_sub(addr, v) uatomic_add((addr), -(v)) | |
536 | ||
537 | #ifndef uatomic_inc | |
538 | #define uatomic_inc(addr) uatomic_add((addr), 1) | |
539 | #endif | |
540 | ||
541 | #ifndef uatomic_dec | |
542 | #define uatomic_dec(addr) uatomic_add((addr), -1) | |
543 | #endif | |
544 | ||
545 | #ifdef __cplusplus | |
546 | } | |
547 | #endif | |
548 | ||
549 | #endif /* _URCU_UATOMIC_GENERIC_H */ |