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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 | ||
31 | #ifndef BITS_PER_LONG | |
32 | #define BITS_PER_LONG (__SIZEOF_LONG__ * 8) | |
33 | #endif | |
34 | ||
35 | #ifndef uatomic_set | |
36 | #define uatomic_set(addr, v) STORE_SHARED(*(addr), (v)) | |
37 | #endif | |
38 | ||
39 | #ifndef uatomic_read | |
40 | #define uatomic_read(addr) LOAD_SHARED(*(addr)) | |
41 | #endif | |
42 | ||
43 | #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR | |
44 | static inline __attribute__((always_inline)) | |
45 | void _uatomic_link_error() | |
46 | { | |
47 | #ifdef ILLEGAL_INSTR | |
48 | /* generate an illegal instruction. Cannot catch this with linker tricks | |
49 | * when optimizations are disabled. */ | |
50 | __asm__ __volatile__(ILLEGAL_INSTR); | |
51 | #else | |
52 | __builtin_trap (); | |
53 | #endif | |
54 | } | |
55 | ||
56 | #else /* #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR */ | |
57 | extern void _uatomic_link_error (); | |
58 | #endif /* #else #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR */ | |
59 | ||
60 | /* cmpxchg */ | |
61 | ||
62 | #ifndef uatomic_cmpxchg | |
63 | static inline __attribute__((always_inline)) | |
64 | unsigned long _uatomic_cmpxchg(void *addr, unsigned long old, | |
65 | unsigned long _new, int len) | |
66 | { | |
67 | switch (len) { | |
f469d839 PB |
68 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
69 | case 1: | |
70 | return __sync_val_compare_and_swap_1(addr, old, _new); | |
71 | #endif | |
72 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
73 | case 2: | |
74 | return __sync_val_compare_and_swap_2(addr, old, _new); | |
75 | #endif | |
8760d94e PB |
76 | case 4: |
77 | return __sync_val_compare_and_swap_4(addr, old, _new); | |
78 | #if (BITS_PER_LONG == 64) | |
79 | case 8: | |
80 | return __sync_val_compare_and_swap_8(addr, old, _new); | |
81 | #endif | |
82 | } | |
83 | _uatomic_link_error(); | |
84 | return 0; | |
85 | } | |
86 | ||
87 | ||
88 | #define uatomic_cmpxchg(addr, old, _new) \ | |
89 | ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), (unsigned long)(old),\ | |
90 | (unsigned long)(_new), \ | |
91 | sizeof(*(addr)))) | |
92 | ||
93 | ||
94 | /* uatomic_add_return */ | |
95 | ||
96 | #ifndef uatomic_add_return | |
97 | static inline __attribute__((always_inline)) | |
98 | unsigned long _uatomic_add_return(void *addr, unsigned long val, | |
99 | int len) | |
100 | { | |
101 | switch (len) { | |
f469d839 PB |
102 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
103 | case 1: | |
104 | return __sync_add_and_fetch_1(addr, val); | |
105 | #endif | |
106 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
107 | case 2: | |
108 | return __sync_add_and_fetch_2(addr, val); | |
109 | #endif | |
8760d94e PB |
110 | case 4: |
111 | return __sync_add_and_fetch_4(addr, val); | |
112 | #if (BITS_PER_LONG == 64) | |
113 | case 8: | |
114 | return __sync_add_and_fetch_8(addr, val); | |
115 | #endif | |
116 | } | |
117 | _uatomic_link_error(); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | ||
122 | #define uatomic_add_return(addr, v) \ | |
123 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
124 | (unsigned long)(v), \ | |
125 | sizeof(*(addr)))) | |
126 | #endif /* #ifndef uatomic_add_return */ | |
127 | ||
128 | #ifndef uatomic_xchg | |
129 | /* xchg */ | |
130 | ||
131 | static inline __attribute__((always_inline)) | |
132 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) | |
133 | { | |
134 | switch (len) { | |
f469d839 PB |
135 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
136 | case 1: | |
137 | { | |
138 | unsigned char old; | |
139 | ||
140 | do { | |
141 | old = uatomic_read((unsigned char *)addr); | |
142 | } while (!__sync_bool_compare_and_swap_1(addr, old, val)); | |
143 | ||
144 | return old; | |
145 | } | |
146 | #endif | |
147 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
148 | case 2: | |
149 | { | |
150 | unsigned short old; | |
151 | ||
152 | do { | |
153 | old = uatomic_read((unsigned short *)addr); | |
154 | } while (!__sync_bool_compare_and_swap_2(addr, old, val)); | |
155 | ||
156 | return old; | |
157 | } | |
158 | #endif | |
8760d94e PB |
159 | case 4: |
160 | { | |
161 | unsigned int old; | |
162 | ||
163 | do { | |
164 | old = uatomic_read((unsigned int *)addr); | |
165 | while (!__sync_bool_compare_and_swap_4(addr, old, val)); | |
166 | ||
167 | } return old; | |
168 | } | |
169 | #if (BITS_PER_LONG == 64) | |
170 | case 8: | |
171 | { | |
172 | unsigned long old; | |
173 | ||
174 | do { | |
175 | old = uatomic_read((unsigned long *)addr); | |
176 | } while (!__sync_bool_compare_and_swap_8(addr, old, val)); | |
177 | ||
178 | return old; | |
179 | } | |
180 | #endif | |
181 | } | |
182 | _uatomic_link_error(); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | #define uatomic_xchg(addr, v) \ | |
187 | ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ | |
188 | sizeof(*(addr)))) | |
189 | #endif /* #ifndef uatomic_xchg */ | |
190 | ||
191 | #else /* #ifndef uatomic_cmpxchg */ | |
192 | ||
193 | #ifndef uatomic_add_return | |
194 | /* uatomic_add_return */ | |
195 | ||
196 | static inline __attribute__((always_inline)) | |
197 | unsigned long _uatomic_add_return(void *addr, unsigned long val, int len) | |
198 | { | |
199 | switch (len) { | |
f469d839 PB |
200 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
201 | case 1: | |
202 | { | |
203 | unsigned char old, oldt; | |
204 | ||
205 | oldt = uatomic_read((unsigned char *)addr); | |
206 | do { | |
207 | old = oldt; | |
208 | oldt = _uatomic_cmpxchg(addr, old, old + val, 1); | |
209 | } while (oldt != old); | |
210 | ||
211 | return old + val; | |
212 | } | |
213 | #endif | |
214 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
215 | case 2: | |
216 | { | |
217 | unsigned short old, oldt; | |
218 | ||
219 | oldt = uatomic_read((unsigned short *)addr); | |
220 | do { | |
221 | old = oldt; | |
222 | oldt = _uatomic_cmpxchg(addr, old, old + val, 2); | |
223 | } while (oldt != old); | |
224 | ||
225 | return old + val; | |
226 | } | |
227 | #endif | |
8760d94e PB |
228 | case 4: |
229 | { | |
230 | unsigned int old, oldt; | |
231 | ||
232 | oldt = uatomic_read((unsigned int *)addr); | |
233 | do { | |
234 | old = oldt; | |
235 | oldt = _uatomic_cmpxchg(addr, old, old + val, 4); | |
236 | } while (oldt != old); | |
237 | ||
238 | return old + val; | |
239 | } | |
240 | #if (BITS_PER_LONG == 64) | |
241 | case 8: | |
242 | { | |
243 | unsigned long old, oldt; | |
244 | ||
245 | oldt = uatomic_read((unsigned long *)addr); | |
246 | do { | |
247 | old = oldt; | |
248 | oldt = _uatomic_cmpxchg(addr, old, old + val, 8); | |
249 | } while (oldt != old); | |
250 | ||
251 | return old + val; | |
252 | } | |
253 | #endif | |
254 | } | |
255 | _uatomic_link_error(); | |
256 | return 0; | |
257 | } | |
258 | ||
259 | #define uatomic_add_return(addr, v) \ | |
260 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
261 | (unsigned long)(v), \ | |
262 | sizeof(*(addr)))) | |
263 | #endif /* #ifndef uatomic_add_return */ | |
264 | ||
265 | #ifndef uatomic_xchg | |
266 | /* xchg */ | |
267 | ||
268 | static inline __attribute__((always_inline)) | |
269 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) | |
270 | { | |
271 | switch (len) { | |
f469d839 PB |
272 | #ifdef UATOMIC_HAS_ATOMIC_BYTE |
273 | case 1: | |
274 | { | |
275 | unsigned char old, oldt; | |
276 | ||
277 | oldt = uatomic_read((unsigned char *)addr); | |
278 | do { | |
279 | old = oldt; | |
280 | oldt = _uatomic_cmpxchg(addr, old, val, 1); | |
281 | } while (oldt != old); | |
282 | ||
283 | return old; | |
284 | } | |
285 | #endif | |
286 | #ifdef UATOMIC_HAS_ATOMIC_SHORT | |
287 | case 2: | |
288 | { | |
289 | unsigned short old, oldt; | |
290 | ||
291 | oldt = uatomic_read((unsigned short *)addr); | |
292 | do { | |
293 | old = oldt; | |
294 | oldt = _uatomic_cmpxchg(addr, old, val, 2); | |
295 | } while (oldt != old); | |
296 | ||
297 | return old; | |
298 | } | |
299 | #endif | |
8760d94e PB |
300 | case 4: |
301 | { | |
302 | unsigned int old, oldt; | |
303 | ||
304 | oldt = uatomic_read((unsigned int *)addr); | |
305 | do { | |
306 | old = oldt; | |
307 | oldt = _uatomic_cmpxchg(addr, old, val, 4); | |
308 | } while (oldt != old); | |
309 | ||
310 | return old; | |
311 | } | |
312 | #if (BITS_PER_LONG == 64) | |
313 | case 8: | |
314 | { | |
315 | unsigned long old, oldt; | |
316 | ||
317 | oldt = uatomic_read((unsigned long *)addr); | |
318 | do { | |
319 | old = oldt; | |
320 | oldt = _uatomic_cmpxchg(addr, old, val, 8); | |
321 | } while (oldt != old); | |
322 | ||
323 | return old; | |
324 | } | |
325 | #endif | |
326 | } | |
327 | _uatomic_link_error(); | |
328 | return 0; | |
329 | } | |
330 | ||
331 | #define uatomic_xchg(addr, v) \ | |
332 | ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ | |
333 | sizeof(*(addr)))) | |
334 | #endif /* #ifndef uatomic_xchg */ | |
335 | ||
336 | #endif /* #else #ifndef uatomic_cmpxchg */ | |
337 | ||
338 | /* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */ | |
339 | ||
340 | #ifndef uatomic_add | |
341 | #define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v)) | |
342 | #endif | |
343 | ||
344 | #define uatomic_sub_return(addr, v) uatomic_add_return((addr), -(v)) | |
345 | #define uatomic_sub(addr, v) uatomic_add((addr), -(v)) | |
346 | ||
347 | #ifndef uatomic_inc | |
348 | #define uatomic_inc(addr) uatomic_add((addr), 1) | |
349 | #endif | |
350 | ||
351 | #ifndef uatomic_dec | |
352 | #define uatomic_dec(addr) uatomic_add((addr), -1) | |
353 | #endif | |
354 | ||
355 | #ifdef __cplusplus | |
356 | } | |
357 | #endif | |
358 | ||
359 | #endif /* _URCU_UATOMIC_GENERIC_H */ |