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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) { | |
68 | case 4: | |
69 | return __sync_val_compare_and_swap_4(addr, old, _new); | |
70 | #if (BITS_PER_LONG == 64) | |
71 | case 8: | |
72 | return __sync_val_compare_and_swap_8(addr, old, _new); | |
73 | #endif | |
74 | } | |
75 | _uatomic_link_error(); | |
76 | return 0; | |
77 | } | |
78 | ||
79 | ||
80 | #define uatomic_cmpxchg(addr, old, _new) \ | |
81 | ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), (unsigned long)(old),\ | |
82 | (unsigned long)(_new), \ | |
83 | sizeof(*(addr)))) | |
84 | ||
85 | ||
86 | /* uatomic_add_return */ | |
87 | ||
88 | #ifndef uatomic_add_return | |
89 | static inline __attribute__((always_inline)) | |
90 | unsigned long _uatomic_add_return(void *addr, unsigned long val, | |
91 | int len) | |
92 | { | |
93 | switch (len) { | |
94 | case 4: | |
95 | return __sync_add_and_fetch_4(addr, val); | |
96 | #if (BITS_PER_LONG == 64) | |
97 | case 8: | |
98 | return __sync_add_and_fetch_8(addr, val); | |
99 | #endif | |
100 | } | |
101 | _uatomic_link_error(); | |
102 | return 0; | |
103 | } | |
104 | ||
105 | ||
106 | #define uatomic_add_return(addr, v) \ | |
107 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
108 | (unsigned long)(v), \ | |
109 | sizeof(*(addr)))) | |
110 | #endif /* #ifndef uatomic_add_return */ | |
111 | ||
112 | #ifndef uatomic_xchg | |
113 | /* xchg */ | |
114 | ||
115 | static inline __attribute__((always_inline)) | |
116 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) | |
117 | { | |
118 | switch (len) { | |
119 | case 4: | |
120 | { | |
121 | unsigned int old; | |
122 | ||
123 | do { | |
124 | old = uatomic_read((unsigned int *)addr); | |
125 | while (!__sync_bool_compare_and_swap_4(addr, old, val)); | |
126 | ||
127 | } return old; | |
128 | } | |
129 | #if (BITS_PER_LONG == 64) | |
130 | case 8: | |
131 | { | |
132 | unsigned long old; | |
133 | ||
134 | do { | |
135 | old = uatomic_read((unsigned long *)addr); | |
136 | } while (!__sync_bool_compare_and_swap_8(addr, old, val)); | |
137 | ||
138 | return old; | |
139 | } | |
140 | #endif | |
141 | } | |
142 | _uatomic_link_error(); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | #define uatomic_xchg(addr, v) \ | |
147 | ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ | |
148 | sizeof(*(addr)))) | |
149 | #endif /* #ifndef uatomic_xchg */ | |
150 | ||
151 | #else /* #ifndef uatomic_cmpxchg */ | |
152 | ||
153 | #ifndef uatomic_add_return | |
154 | /* uatomic_add_return */ | |
155 | ||
156 | static inline __attribute__((always_inline)) | |
157 | unsigned long _uatomic_add_return(void *addr, unsigned long val, int len) | |
158 | { | |
159 | switch (len) { | |
160 | case 4: | |
161 | { | |
162 | unsigned int old, oldt; | |
163 | ||
164 | oldt = uatomic_read((unsigned int *)addr); | |
165 | do { | |
166 | old = oldt; | |
167 | oldt = _uatomic_cmpxchg(addr, old, old + val, 4); | |
168 | } while (oldt != old); | |
169 | ||
170 | return old + val; | |
171 | } | |
172 | #if (BITS_PER_LONG == 64) | |
173 | case 8: | |
174 | { | |
175 | unsigned long old, oldt; | |
176 | ||
177 | oldt = uatomic_read((unsigned long *)addr); | |
178 | do { | |
179 | old = oldt; | |
180 | oldt = _uatomic_cmpxchg(addr, old, old + val, 8); | |
181 | } while (oldt != old); | |
182 | ||
183 | return old + val; | |
184 | } | |
185 | #endif | |
186 | } | |
187 | _uatomic_link_error(); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | #define uatomic_add_return(addr, v) \ | |
192 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
193 | (unsigned long)(v), \ | |
194 | sizeof(*(addr)))) | |
195 | #endif /* #ifndef uatomic_add_return */ | |
196 | ||
197 | #ifndef uatomic_xchg | |
198 | /* xchg */ | |
199 | ||
200 | static inline __attribute__((always_inline)) | |
201 | unsigned long _uatomic_exchange(void *addr, unsigned long val, int len) | |
202 | { | |
203 | switch (len) { | |
204 | case 4: | |
205 | { | |
206 | unsigned int old, oldt; | |
207 | ||
208 | oldt = uatomic_read((unsigned int *)addr); | |
209 | do { | |
210 | old = oldt; | |
211 | oldt = _uatomic_cmpxchg(addr, old, val, 4); | |
212 | } while (oldt != old); | |
213 | ||
214 | return old; | |
215 | } | |
216 | #if (BITS_PER_LONG == 64) | |
217 | case 8: | |
218 | { | |
219 | unsigned long old, oldt; | |
220 | ||
221 | oldt = uatomic_read((unsigned long *)addr); | |
222 | do { | |
223 | old = oldt; | |
224 | oldt = _uatomic_cmpxchg(addr, old, val, 8); | |
225 | } while (oldt != old); | |
226 | ||
227 | return old; | |
228 | } | |
229 | #endif | |
230 | } | |
231 | _uatomic_link_error(); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | #define uatomic_xchg(addr, v) \ | |
236 | ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ | |
237 | sizeof(*(addr)))) | |
238 | #endif /* #ifndef uatomic_xchg */ | |
239 | ||
240 | #endif /* #else #ifndef uatomic_cmpxchg */ | |
241 | ||
242 | /* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */ | |
243 | ||
244 | #ifndef uatomic_add | |
245 | #define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v)) | |
246 | #endif | |
247 | ||
248 | #define uatomic_sub_return(addr, v) uatomic_add_return((addr), -(v)) | |
249 | #define uatomic_sub(addr, v) uatomic_add((addr), -(v)) | |
250 | ||
251 | #ifndef uatomic_inc | |
252 | #define uatomic_inc(addr) uatomic_add((addr), 1) | |
253 | #endif | |
254 | ||
255 | #ifndef uatomic_dec | |
256 | #define uatomic_dec(addr) uatomic_add((addr), -1) | |
257 | #endif | |
258 | ||
259 | #ifdef __cplusplus | |
260 | } | |
261 | #endif | |
262 | ||
263 | #endif /* _URCU_UATOMIC_GENERIC_H */ |