1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
|
#ifndef __TOOLS_LINUX_ATOMIC_H
#define __TOOLS_LINUX_ATOMIC_H
#include <linux/compiler.h>
#include <linux/types.h>
typedef struct {
int counter;
} atomic_t;
typedef struct {
long counter;
} atomic_long_t;
typedef struct {
u64 counter;
} atomic64_t;
#ifndef C11_ATOMICS
#include <urcu/uatomic.h>
#if (CAA_BITS_PER_LONG != 64)
#define ATOMIC64_SPINLOCK
#endif
#define __ATOMIC_READ(p) uatomic_read(p)
#define __ATOMIC_SET(p, v) uatomic_set(p, v)
#define __ATOMIC_ADD_RETURN(v, p) uatomic_add_return(p, v)
#define __ATOMIC_SUB_RETURN(v, p) uatomic_sub_return(p, v)
#define __ATOMIC_ADD(v, p) uatomic_add(p, v)
#define __ATOMIC_SUB(v, p) uatomic_sub(p, v)
#define __ATOMIC_INC(p) uatomic_inc(p)
#define __ATOMIC_DEC(p) uatomic_dec(p)
#define __ATOMIC_AND(v, p) uatomic_and(p, v)
#define __ATOMIC_OR(v, p) uatomic_or(p, v)
#define xchg(p, v) uatomic_xchg(p, v)
#define xchg_acquire(p, v) uatomic_xchg(p, v)
#define cmpxchg(p, old, new) uatomic_cmpxchg(p, old, new)
#define cmpxchg_acquire(p, old, new) uatomic_cmpxchg(p, old, new)
#define cmpxchg_release(p, old, new) uatomic_cmpxchg(p, old, new)
#define smp_mb__before_atomic() cmm_smp_mb__before_uatomic_add()
#define smp_mb__after_atomic() cmm_smp_mb__after_uatomic_add()
#define smp_wmb() cmm_smp_wmb()
#define smp_rmb() cmm_smp_rmb()
#define smp_mb() cmm_smp_mb()
#define smp_read_barrier_depends() cmm_smp_read_barrier_depends()
#else /* C11_ATOMICS */
#define __ATOMIC_READ(p) __atomic_load_n(p, __ATOMIC_RELAXED)
#define __ATOMIC_SET(p, v) __atomic_store_n(p, v, __ATOMIC_RELAXED)
#define __ATOMIC_ADD_RETURN(v, p) __atomic_add_fetch(p, v, __ATOMIC_RELAXED)
#define __ATOMIC_ADD_RETURN_RELEASE(v, p) \
__atomic_add_fetch(p, v, __ATOMIC_RELEASE)
#define __ATOMIC_SUB_RETURN(v, p) __atomic_sub_fetch(p, v, __ATOMIC_RELAXED)
#define __ATOMIC_SUB_RETURN_RELEASE(v, p) \
__atomic_sub_fetch(p, v, __ATOMIC_RELEASE)
#define __ATOMIC_AND(p) __atomic_and_fetch(p, v, __ATOMIC_RELAXED)
#define __ATOMIC_OR(p) __atomic_or_fetch(p, v, __ATOMIC_RELAXED)
#define xchg(p, v) __atomic_exchange_n(p, v, __ATOMIC_SEQ_CST)
#define xchg_acquire(p, v) __atomic_exchange_n(p, v, __ATOMIC_ACQUIRE)
#define cmpxchg(p, old, new) \
({ \
typeof(*(p)) __old = (old); \
\
__atomic_compare_exchange_n((p), &__old, new, false, \
__ATOMIC_SEQ_CST, \
__ATOMIC_SEQ_CST); \
__old; \
})
#define cmpxchg_acquire(p, old, new) \
({ \
typeof(*(p)) __old = (old); \
\
__atomic_compare_exchange_n((p), &__old, new, false, \
__ATOMIC_ACQUIRE, \
__ATOMIC_ACQUIRE); \
__old; \
})
#define cmpxchg_release(p, old, new) \
({ \
typeof(*(p)) __old = (old); \
\
__atomic_compare_exchange_n((p), &__old, new, false, \
__ATOMIC_RELEASE, \
__ATOMIC_RELEASE); \
__old; \
})
#define smp_mb__before_atomic() __atomic_thread_fence(__ATOMIC_SEQ_CST)
#define smp_mb__after_atomic() __atomic_thread_fence(__ATOMIC_SEQ_CST)
#define smp_wmb() __atomic_thread_fence(__ATOMIC_SEQ_CST)
#define smp_rmb() __atomic_thread_fence(__ATOMIC_SEQ_CST)
#define smp_mb() __atomic_thread_fence(__ATOMIC_SEQ_CST)
#define smp_read_barrier_depends()
#endif
#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); smp_mb(); } while (0)
#define smp_load_acquire(p) \
({ \
typeof(*p) ___p1 = READ_ONCE(*p); \
smp_mb(); \
___p1; \
})
#define smp_store_release(p, v) \
do { \
smp_mb(); \
WRITE_ONCE(*p, v); \
} while (0)
/* atomic interface: */
#ifndef __ATOMIC_ADD
#define __ATOMIC_ADD(i, v) __ATOMIC_ADD_RETURN(i, v)
#endif
#ifndef __ATOMIC_ADD_RETURN_RELEASE
#define __ATOMIC_ADD_RETURN_RELEASE(i, v) \
({ smp_mb__before_atomic(); __ATOMIC_ADD_RETURN(i, v); })
#endif
#ifndef __ATOMIC_SUB_RETURN_RELEASE
#define __ATOMIC_SUB_RETURN_RELEASE(i, v) \
({ smp_mb__before_atomic(); __ATOMIC_SUB_RETURN(i, v); })
#endif
#ifndef __ATOMIC_SUB
#define __ATOMIC_SUB(i, v) __ATOMIC_SUB_RETURN(i, v)
#endif
#ifndef __ATOMIC_INC_RETURN
#define __ATOMIC_INC_RETURN(v) __ATOMIC_ADD_RETURN(1, v)
#endif
#ifndef __ATOMIC_DEC_RETURN
#define __ATOMIC_DEC_RETURN(v) __ATOMIC_SUB_RETURN(1, v)
#endif
#ifndef __ATOMIC_INC
#define __ATOMIC_INC(v) __ATOMIC_ADD(1, v)
#endif
#ifndef __ATOMIC_DEC
#define __ATOMIC_DEC(v) __ATOMIC_SUB(1, v)
#endif
#define DEF_ATOMIC_OPS(a_type, i_type) \
static inline i_type a_type##_read(const a_type##_t *v) \
{ \
return __ATOMIC_READ(&v->counter); \
} \
\
static inline void a_type##_set(a_type##_t *v, i_type i) \
{ \
return __ATOMIC_SET(&v->counter, i); \
} \
\
static inline i_type a_type##_add_return(i_type i, a_type##_t *v) \
{ \
return __ATOMIC_ADD_RETURN(i, &v->counter); \
} \
\
static inline i_type a_type##_add_return_release(i_type i, a_type##_t *v)\
{ \
return __ATOMIC_ADD_RETURN_RELEASE(i, &v->counter); \
} \
\
static inline i_type a_type##_sub_return_release(i_type i, a_type##_t *v)\
{ \
return __ATOMIC_SUB_RETURN_RELEASE(i, &v->counter); \
} \
\
static inline i_type a_type##_sub_return(i_type i, a_type##_t *v) \
{ \
return __ATOMIC_SUB_RETURN(i, &v->counter); \
} \
\
static inline void a_type##_add(i_type i, a_type##_t *v) \
{ \
__ATOMIC_ADD(i, &v->counter); \
} \
\
static inline void a_type##_sub(i_type i, a_type##_t *v) \
{ \
__ATOMIC_SUB(i, &v->counter); \
} \
\
static inline i_type a_type##_inc_return(a_type##_t *v) \
{ \
return __ATOMIC_INC_RETURN(&v->counter); \
} \
\
static inline i_type a_type##_dec_return(a_type##_t *v) \
{ \
return __ATOMIC_DEC_RETURN(&v->counter); \
} \
\
static inline void a_type##_inc(a_type##_t *v) \
{ \
__ATOMIC_INC(&v->counter); \
} \
\
static inline void a_type##_dec(a_type##_t *v) \
{ \
__ATOMIC_DEC(&v->counter); \
} \
\
static inline bool a_type##_add_negative(i_type i, a_type##_t *v) \
{ \
return __ATOMIC_ADD_RETURN(i, &v->counter) < 0; \
} \
\
static inline bool a_type##_sub_and_test(i_type i, a_type##_t *v) \
{ \
return __ATOMIC_SUB_RETURN(i, &v->counter) == 0; \
} \
\
static inline bool a_type##_inc_and_test(a_type##_t *v) \
{ \
return __ATOMIC_INC_RETURN(&v->counter) == 0; \
} \
\
static inline bool a_type##_dec_and_test(a_type##_t *v) \
{ \
return __ATOMIC_DEC_RETURN(&v->counter) == 0; \
} \
\
static inline i_type a_type##_add_unless(a_type##_t *v, i_type a, i_type u)\
{ \
i_type old, c = __ATOMIC_READ(&v->counter); \
while (c != u && (old = cmpxchg(&v->counter, c, c + a)) != c) \
c = old; \
return c; \
} \
\
static inline bool a_type##_inc_not_zero(a_type##_t *v) \
{ \
return a_type##_add_unless(v, 1, 0); \
} \
\
static inline void a_type##_and(i_type a, a_type##_t *v) \
{ \
__ATOMIC_AND(a, v); \
} \
\
static inline void a_type##_or(i_type a, a_type##_t *v) \
{ \
__ATOMIC_OR(a, v); \
} \
\
static inline i_type a_type##_xchg(a_type##_t *v, i_type i) \
{ \
return xchg(&v->counter, i); \
} \
\
static inline i_type a_type##_cmpxchg(a_type##_t *v, i_type old, i_type new)\
{ \
return cmpxchg(&v->counter, old, new); \
} \
\
static inline i_type a_type##_cmpxchg_acquire(a_type##_t *v, i_type old, i_type new)\
{ \
return cmpxchg_acquire(&v->counter, old, new); \
}
DEF_ATOMIC_OPS(atomic, int)
DEF_ATOMIC_OPS(atomic_long, long)
#ifndef ATOMIC64_SPINLOCK
DEF_ATOMIC_OPS(atomic64, s64)
#else
s64 atomic64_read(const atomic64_t *v);
void atomic64_set(atomic64_t *v, s64);
s64 atomic64_add_return(s64, atomic64_t *);
s64 atomic64_sub_return(s64, atomic64_t *);
void atomic64_add(s64, atomic64_t *);
void atomic64_sub(s64, atomic64_t *);
s64 atomic64_xchg(atomic64_t *, s64);
s64 atomic64_cmpxchg(atomic64_t *, s64, s64);
#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
#define atomic64_inc(v) atomic64_add(1LL, (v))
#define atomic64_inc_return(v) atomic64_add_return(1LL, (v))
#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
#define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0)
#define atomic64_dec(v) atomic64_sub(1LL, (v))
#define atomic64_dec_return(v) atomic64_sub_return(1LL, (v))
#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL)
static inline s64 atomic64_add_return_release(s64 i, atomic64_t *v)
{
smp_mb__before_atomic();
return atomic64_add_return(i, v);
}
static inline s64 atomic64_cmpxchg_acquire(atomic64_t *v, s64 old, s64 new)
{
return atomic64_cmpxchg(v, old, new);
}
#endif
#endif /* __TOOLS_LINUX_ATOMIC_H */
|
