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
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
|
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2010. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Description: The ethread atomic API
* Author: Rickard Green
*/
#ifndef ETHR_ATOMIC_H__
#define ETHR_ATOMIC_H__
#if !defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_ATOMIC_IMPL__)
# define ETHR_NEED_ATOMIC_PROTOTYPES__
#endif
#ifdef ETHR_HAVE_NATIVE_ATOMICS
/*
* Map ethread native atomics to ethread API atomics.
*/
typedef ethr_native_atomic_t ethr_atomic_t;
#else
typedef ethr_sint_t ethr_atomic_t;
#endif
#ifdef ETHR_NEED_ATOMIC_PROTOTYPES__
void ethr_atomic_init(ethr_atomic_t *, ethr_sint_t);
void ethr_atomic_set(ethr_atomic_t *, ethr_sint_t);
ethr_sint_t ethr_atomic_read(ethr_atomic_t *);
ethr_sint_t ethr_atomic_inc_read(ethr_atomic_t *);
ethr_sint_t ethr_atomic_dec_read(ethr_atomic_t *);
void ethr_atomic_inc(ethr_atomic_t *);
void ethr_atomic_dec(ethr_atomic_t *);
ethr_sint_t ethr_atomic_add_read(ethr_atomic_t *, ethr_sint_t);
void ethr_atomic_add(ethr_atomic_t *, ethr_sint_t);
ethr_sint_t ethr_atomic_read_band(ethr_atomic_t *, ethr_sint_t);
ethr_sint_t ethr_atomic_read_bor(ethr_atomic_t *, ethr_sint_t);
ethr_sint_t ethr_atomic_xchg(ethr_atomic_t *, ethr_sint_t);
ethr_sint_t ethr_atomic_cmpxchg(ethr_atomic_t *, ethr_sint_t, ethr_sint_t);
ethr_sint_t ethr_atomic_read_acqb(ethr_atomic_t *);
ethr_sint_t ethr_atomic_inc_read_acqb(ethr_atomic_t *);
void ethr_atomic_set_relb(ethr_atomic_t *, ethr_sint_t);
void ethr_atomic_dec_relb(ethr_atomic_t *);
ethr_sint_t ethr_atomic_dec_read_relb(ethr_atomic_t *);
ethr_sint_t ethr_atomic_cmpxchg_acqb(ethr_atomic_t *, ethr_sint_t, ethr_sint_t);
ethr_sint_t ethr_atomic_cmpxchg_relb(ethr_atomic_t *, ethr_sint_t, ethr_sint_t);
#endif
int ethr_init_atomics(void);
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_ATOMIC_IMPL__)
#ifndef ETHR_HAVE_NATIVE_ATOMICS
/*
* Fallbacks for atomics used in absence of a native implementation.
*/
#define ETHR_ATOMIC_ADDR_BITS 10
#define ETHR_ATOMIC_ADDR_SHIFT 6
typedef struct {
union {
ethr_spinlock_t lck;
char buf[ETHR_CACHE_LINE_SIZE];
} u;
} ethr_atomic_protection_t;
extern ethr_atomic_protection_t ethr_atomic_protection__[1 << ETHR_ATOMIC_ADDR_BITS];
#define ETHR_ATOMIC_PTR2LCK__(PTR) \
(ðr_atomic_protection__[((((unsigned long) (PTR)) >> ETHR_ATOMIC_ADDR_SHIFT) \
& ((1 << ETHR_ATOMIC_ADDR_BITS) - 1))].u.lck)
#define ETHR_ATOMIC_OP_FALLBACK_IMPL__(AP, EXPS) \
do { \
ethr_spinlock_t *slp__ = ETHR_ATOMIC_PTR2LCK__((AP)); \
ethr_spin_lock(slp__); \
{ EXPS; } \
ethr_spin_unlock(slp__); \
} while (0)
#endif
static ETHR_INLINE void
ETHR_INLINE_FUNC_NAME_(ethr_atomic_init)(ethr_atomic_t *var, ethr_sint_t i)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
ethr_native_atomic_init(var, i);
#else
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var, *var = i);
#endif
}
static ETHR_INLINE void
ETHR_INLINE_FUNC_NAME_(ethr_atomic_set)(ethr_atomic_t *var, ethr_sint_t i)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
ethr_native_atomic_set(var, i);
#else
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var, *var = i);
#endif
}
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_read)(ethr_atomic_t *var)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_read(var);
#else
ethr_sint_t res;
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var, res = *var);
return res;
#endif
}
static ETHR_INLINE void
ETHR_INLINE_FUNC_NAME_(ethr_atomic_add)(ethr_atomic_t *var, ethr_sint_t incr)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
ethr_native_atomic_add(var, incr);
#else
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var, *var += incr);
#endif
}
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_add_read)(ethr_atomic_t *var, ethr_sint_t i)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_add_return(var, i);
#else
ethr_sint_t res;
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var, *var += i; res = *var);
return res;
#endif
}
static ETHR_INLINE void
ETHR_INLINE_FUNC_NAME_(ethr_atomic_inc)(ethr_atomic_t *var)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
ethr_native_atomic_inc(var);
#else
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var, ++(*var));
#endif
}
static ETHR_INLINE void
ETHR_INLINE_FUNC_NAME_(ethr_atomic_dec)(ethr_atomic_t *var)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
ethr_native_atomic_dec(var);
#else
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var, --(*var));
#endif
}
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_inc_read)(ethr_atomic_t *var)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_inc_return(var);
#else
ethr_sint_t res;
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var, res = ++(*var));
return res;
#endif
}
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_dec_read)(ethr_atomic_t *var)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_dec_return(var);
#else
ethr_sint_t res;
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var, res = --(*var));
return res;
#endif
}
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_read_band)(ethr_atomic_t *var,
ethr_sint_t mask)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_and_retold(var, mask);
#else
ethr_sint_t res;
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var, res = *var; *var &= mask);
return res;
#endif
}
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_read_bor)(ethr_atomic_t *var,
ethr_sint_t mask)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_or_retold(var, mask);
#else
ethr_sint_t res;
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var, res = *var; *var |= mask);
return res;
#endif
}
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_xchg)(ethr_atomic_t *var, ethr_sint_t new)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_xchg(var, new);
#else
ethr_sint_t res;
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var, res = *var; *var = new);
return res;
#endif
}
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_cmpxchg)(ethr_atomic_t *var,
ethr_sint_t new,
ethr_sint_t exp)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_cmpxchg(var, new, exp);
#else
ethr_sint_t res;
ETHR_ATOMIC_OP_FALLBACK_IMPL__(var,
{
res = *var;
if (__builtin_expect(res == exp, 1))
*var = new;
});
return res;
#endif
}
/*
* Important memory barrier requirements.
*
* The following atomic operations *must* supply a memory barrier of
* at least the type specified by its suffix:
* _acqb = acquire barrier
* _relb = release barrier
*/
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_read_acqb)(ethr_atomic_t *var)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_read_acqb(var);
#else
return ETHR_INLINE_FUNC_NAME_(ethr_atomic_read)(var);
#endif
}
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_inc_read_acqb)(ethr_atomic_t *var)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_inc_return_acqb(var);
#else
return ETHR_INLINE_FUNC_NAME_(ethr_atomic_inc_read)(var);
#endif
}
static ETHR_INLINE void
ETHR_INLINE_FUNC_NAME_(ethr_atomic_set_relb)(ethr_atomic_t *var,
ethr_sint_t val)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
ethr_native_atomic_set_relb(var, val);
#else
ETHR_INLINE_FUNC_NAME_(ethr_atomic_set)(var, val);
#endif
}
static ETHR_INLINE void
ETHR_INLINE_FUNC_NAME_(ethr_atomic_dec_relb)(ethr_atomic_t *var)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
ethr_native_atomic_dec_relb(var);
#else
ETHR_INLINE_FUNC_NAME_(ethr_atomic_dec)(var);
#endif
}
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_dec_read_relb)(ethr_atomic_t *var)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_dec_return_relb(var);
#else
return ETHR_INLINE_FUNC_NAME_(ethr_atomic_dec_read)(var);
#endif
}
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_cmpxchg_acqb)(ethr_atomic_t *var,
ethr_sint_t new,
ethr_sint_t exp)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_cmpxchg_acqb(var, new, exp);
#else
return ETHR_INLINE_FUNC_NAME_(ethr_atomic_cmpxchg)(var, new, exp);
#endif
}
static ETHR_INLINE ethr_sint_t
ETHR_INLINE_FUNC_NAME_(ethr_atomic_cmpxchg_relb)(ethr_atomic_t *var,
ethr_sint_t new,
ethr_sint_t exp)
{
#ifdef ETHR_HAVE_NATIVE_ATOMICS
return ethr_native_atomic_cmpxchg_relb(var, new, exp);
#else
return ETHR_INLINE_FUNC_NAME_(ethr_atomic_cmpxchg)(var, new, exp);
#endif
}
#endif /* ETHR_TRY_INLINE_FUNCS */
#endif
|
