File: gatomic.h

package info (click to toggle)
glib2.0 2.58.3-2+deb10u2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, buster-backports, sid
  • size: 48,956 kB
  • sloc: ansic: 452,656; xml: 16,781; python: 6,149; makefile: 3,776; sh: 1,499; perl: 1,140; cpp: 9
file content (291 lines) | stat: -rw-r--r-- 15,272 bytes parent folder | download | duplicates (2)
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
/*
 * Copyright © 2011 Ryan Lortie
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Ryan Lortie <desrt@desrt.ca>
 */

#ifndef __G_ATOMIC_H__
#define __G_ATOMIC_H__

#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
#error "Only <glib.h> can be included directly."
#endif

#include <glib/gtypes.h>

G_BEGIN_DECLS

GLIB_AVAILABLE_IN_ALL
gint                    g_atomic_int_get                      (const volatile gint *atomic);
GLIB_AVAILABLE_IN_ALL
void                    g_atomic_int_set                      (volatile gint  *atomic,
                                                               gint            newval);
GLIB_AVAILABLE_IN_ALL
void                    g_atomic_int_inc                      (volatile gint  *atomic);
GLIB_AVAILABLE_IN_ALL
gboolean                g_atomic_int_dec_and_test             (volatile gint  *atomic);
GLIB_AVAILABLE_IN_ALL
gboolean                g_atomic_int_compare_and_exchange     (volatile gint  *atomic,
                                                               gint            oldval,
                                                               gint            newval);
GLIB_AVAILABLE_IN_ALL
gint                    g_atomic_int_add                      (volatile gint  *atomic,
                                                               gint            val);
GLIB_AVAILABLE_IN_2_30
guint                   g_atomic_int_and                      (volatile guint *atomic,
                                                               guint           val);
GLIB_AVAILABLE_IN_2_30
guint                   g_atomic_int_or                       (volatile guint *atomic,
                                                               guint           val);
GLIB_AVAILABLE_IN_ALL
guint                   g_atomic_int_xor                      (volatile guint *atomic,
                                                               guint           val);

GLIB_AVAILABLE_IN_ALL
gpointer                g_atomic_pointer_get                  (const volatile void *atomic);
GLIB_AVAILABLE_IN_ALL
void                    g_atomic_pointer_set                  (volatile void  *atomic,
                                                               gpointer        newval);
GLIB_AVAILABLE_IN_ALL
gboolean                g_atomic_pointer_compare_and_exchange (volatile void  *atomic,
                                                               gpointer        oldval,
                                                               gpointer        newval);
GLIB_AVAILABLE_IN_ALL
gssize                  g_atomic_pointer_add                  (volatile void  *atomic,
                                                               gssize          val);
GLIB_AVAILABLE_IN_2_30
gsize                   g_atomic_pointer_and                  (volatile void  *atomic,
                                                               gsize           val);
GLIB_AVAILABLE_IN_2_30
gsize                   g_atomic_pointer_or                   (volatile void  *atomic,
                                                               gsize           val);
GLIB_AVAILABLE_IN_ALL
gsize                   g_atomic_pointer_xor                  (volatile void  *atomic,
                                                               gsize           val);

GLIB_DEPRECATED_IN_2_30_FOR(g_atomic_int_add)
gint                    g_atomic_int_exchange_and_add         (volatile gint  *atomic,
                                                               gint            val);

G_END_DECLS

#if defined(G_ATOMIC_LOCK_FREE) && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)

/* We prefer the new C11-style atomic extension of GCC if available */
#if defined(__ATOMIC_SEQ_CST) && !defined(__clang__)

/* This assumes sizeof(int) is 4: gatomic.c statically
 * asserts that (using G_STATIC_ASSERT at top-level in a header was
 * problematic, see #730932) */

#define g_atomic_int_get(atomic) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
    (void) (0 ? *(atomic) ^ *(atomic) : 1);                                  \
    (gint) __atomic_load_4 ((atomic), __ATOMIC_SEQ_CST);                     \
  }))
#define g_atomic_int_set(atomic, newval) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
    (void) (0 ? *(atomic) ^ (newval) : 1);                                   \
    __atomic_store_4 ((atomic), (newval), __ATOMIC_SEQ_CST);                 \
  }))

#if GLIB_SIZEOF_VOID_P == 8

#define g_atomic_pointer_get(atomic) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
    guint64 gapg_temp = __atomic_load_8 ((atomic), __ATOMIC_SEQ_CST);        \
    (gpointer) gapg_temp;                                                    \
  }))
#define g_atomic_pointer_set(atomic, newval) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
    (void) (0 ? (gpointer) *(atomic) : NULL);                                \
    __atomic_store_8 ((atomic), (gsize) (newval), __ATOMIC_SEQ_CST);         \
  }))

#else /* GLIB_SIZEOF_VOID_P == 8 */

/* This assumes that if sizeof(void *) is not 8, then it is 4:
 * gatomic.c statically asserts that (using G_STATIC_ASSERT
 * at top-level in a header was problematic, see #730932) */

#define g_atomic_pointer_get(atomic) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
    guint32 gapg_temp = __atomic_load_4 ((atomic), __ATOMIC_SEQ_CST);        \
    (gpointer) gapg_temp;                                                    \
  }))
#define g_atomic_pointer_set(atomic, newval) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
    (void) (0 ? (gpointer) *(atomic) : NULL);                                \
    __atomic_store_4 ((atomic), (gsize) (newval), __ATOMIC_SEQ_CST);         \
  }))

#endif /* GLIB_SIZEOF_VOID_P == 8 */

#else /* defined(__ATOMIC_SEQ_CST) */

#define g_atomic_int_get(atomic) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
    (void) (0 ? *(atomic) ^ *(atomic) : 1);                                  \
    __sync_synchronize ();                                                   \
    (gint) *(atomic);                                                        \
  }))
#define g_atomic_int_set(atomic, newval) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
    (void) (0 ? *(atomic) ^ (newval) : 1);                                   \
    *(atomic) = (newval);                                                    \
    __sync_synchronize ();                                                   \
  }))
#define g_atomic_pointer_get(atomic) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
    __sync_synchronize ();                                                   \
    (gpointer) *(atomic);                                                    \
  }))
#define g_atomic_pointer_set(atomic, newval) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
    (void) (0 ? (gpointer) *(atomic) : NULL);                                \
    *(atomic) = (__typeof__ (*(atomic))) (gsize) (newval);                   \
    __sync_synchronize ();                                                   \
  }))

#endif /* !defined(__ATOMIC_SEQ_CST) */

#define g_atomic_int_inc(atomic) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
    (void) (0 ? *(atomic) ^ *(atomic) : 1);                                  \
    (void) __sync_fetch_and_add ((atomic), 1);                               \
  }))
#define g_atomic_int_dec_and_test(atomic) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
    (void) (0 ? *(atomic) ^ *(atomic) : 1);                                  \
    __sync_fetch_and_sub ((atomic), 1) == 1;                                 \
  }))
#define g_atomic_int_compare_and_exchange(atomic, oldval, newval) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
    (void) (0 ? *(atomic) ^ (newval) ^ (oldval) : 1);                        \
    __sync_bool_compare_and_swap ((atomic), (oldval), (newval)) ? TRUE : FALSE; \
  }))
#define g_atomic_int_add(atomic, val) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
    (void) (0 ? *(atomic) ^ (val) : 1);                                      \
    (gint) __sync_fetch_and_add ((atomic), (val));                           \
  }))
#define g_atomic_int_and(atomic, val) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
    (void) (0 ? *(atomic) ^ (val) : 1);                                      \
    (guint) __sync_fetch_and_and ((atomic), (val));                          \
  }))
#define g_atomic_int_or(atomic, val) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
    (void) (0 ? *(atomic) ^ (val) : 1);                                      \
    (guint) __sync_fetch_and_or ((atomic), (val));                           \
  }))
#define g_atomic_int_xor(atomic, val) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
    (void) (0 ? *(atomic) ^ (val) : 1);                                      \
    (guint) __sync_fetch_and_xor ((atomic), (val));                          \
  }))

#define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
    (void) (0 ? (gpointer) *(atomic) : NULL);                                \
    __sync_bool_compare_and_swap ((atomic), (oldval), (newval)) ? TRUE : FALSE; \
  }))
#define g_atomic_pointer_add(atomic, val) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
    (void) (0 ? (gpointer) *(atomic) : NULL);                                \
    (void) (0 ? (val) ^ (val) : 1);                                          \
    (gssize) __sync_fetch_and_add ((atomic), (val));                         \
  }))
#define g_atomic_pointer_and(atomic, val) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
    (void) (0 ? (gpointer) *(atomic) : NULL);                                \
    (void) (0 ? (val) ^ (val) : 1);                                          \
    (gsize) __sync_fetch_and_and ((atomic), (val));                          \
  }))
#define g_atomic_pointer_or(atomic, val) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
    (void) (0 ? (gpointer) *(atomic) : NULL);                                \
    (void) (0 ? (val) ^ (val) : 1);                                          \
    (gsize) __sync_fetch_and_or ((atomic), (val));                           \
  }))
#define g_atomic_pointer_xor(atomic, val) \
  (G_GNUC_EXTENSION ({                                                       \
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer));                 \
    (void) (0 ? (gpointer) *(atomic) : NULL);                                \
    (void) (0 ? (val) ^ (val) : 1);                                          \
    (gsize) __sync_fetch_and_xor ((atomic), (val));                          \
  }))

#else /* defined(G_ATOMIC_LOCK_FREE) && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4) */

#define g_atomic_int_get(atomic) \
  (g_atomic_int_get ((gint *) (atomic)))
#define g_atomic_int_set(atomic, newval) \
  (g_atomic_int_set ((gint *) (atomic), (gint) (newval)))
#define g_atomic_int_compare_and_exchange(atomic, oldval, newval) \
  (g_atomic_int_compare_and_exchange ((gint *) (atomic), (oldval), (newval)))
#define g_atomic_int_add(atomic, val) \
  (g_atomic_int_add ((gint *) (atomic), (val)))
#define g_atomic_int_and(atomic, val) \
  (g_atomic_int_and ((guint *) (atomic), (val)))
#define g_atomic_int_or(atomic, val) \
  (g_atomic_int_or ((guint *) (atomic), (val)))
#define g_atomic_int_xor(atomic, val) \
  (g_atomic_int_xor ((guint *) (atomic), (val)))
#define g_atomic_int_inc(atomic) \
  (g_atomic_int_inc ((gint *) (atomic)))
#define g_atomic_int_dec_and_test(atomic) \
  (g_atomic_int_dec_and_test ((gint *) (atomic)))

#define g_atomic_pointer_get(atomic) \
  (g_atomic_pointer_get (atomic))
#define g_atomic_pointer_set(atomic, newval) \
  (g_atomic_pointer_set ((atomic), (gpointer) (newval)))
#define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
  (g_atomic_pointer_compare_and_exchange ((atomic), (gpointer) (oldval), (gpointer) (newval)))
#define g_atomic_pointer_add(atomic, val) \
  (g_atomic_pointer_add ((atomic), (gssize) (val)))
#define g_atomic_pointer_and(atomic, val) \
  (g_atomic_pointer_and ((atomic), (gsize) (val)))
#define g_atomic_pointer_or(atomic, val) \
  (g_atomic_pointer_or ((atomic), (gsize) (val)))
#define g_atomic_pointer_xor(atomic, val) \
  (g_atomic_pointer_xor ((atomic), (gsize) (val)))

#endif /* defined(__GNUC__) && defined(G_ATOMIC_OP_USE_GCC_BUILTINS) */

#endif /* __G_ATOMIC_H__ */