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
|
/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
The GNU C 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.
The GNU C 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 the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _ATOMIC_H
#define _ATOMIC_H 1
#include <stdlib.h>
#include <bits/atomic.h>
#ifndef atomic_compare_and_exchange_acq
# define atomic_compare_and_exchange_acq(mem, newval, oldval) \
({ __typeof (__arch_compare_and_exchange_32_acq (mem, newval, oldval)) \
__result; \
if (sizeof (*mem) == 1) \
__result = __arch_compare_and_exchange_8_acq (mem, newval, oldval); \
else if (sizeof (*mem) == 2) \
__result = __arch_compare_and_exchange_16_acq (mem, newval, oldval); \
else if (sizeof (*mem) == 4) \
__result = __arch_compare_and_exchange_32_acq (mem, newval, oldval); \
else if (sizeof (*mem) == 8) \
__result = __arch_compare_and_exchange_64_acq (mem, newval, oldval); \
else \
abort (); \
__result; })
#endif
#ifndef atomic_compare_and_exchange_rel
# define atomic_compare_and_exchange_rel(mem, oldval, newval) \
atomic_compare_and_exchange_acq (mem, oldval, newval)
#endif
/* Store NEWVALUE in *MEM and return the old value. */
#ifndef atomic_exchange
# define atomic_exchange(mem, newvalue) \
({ __typeof (*mem) __oldval; \
__typeof (mem) __memp = (mem); \
__typeof (*mem) __value = (newvalue); \
\
do \
__oldval = (*__memp); \
while (__builtin_expect (atomic_compare_and_exchange_acq (__memp, \
__value, \
__oldval), 0));\
\
__oldval; })
#endif
/* Add VALUE to *MEM and return the old value of *MEM. */
#ifndef atomic_exchange_and_add
# define atomic_exchange_and_add(mem, value) \
({ __typeof (*mem) __oldval; \
__typeof (mem) __memp = (mem); \
__typeof (*mem) __value = (value); \
\
do \
__oldval = (*__memp); \
while (__builtin_expect (atomic_compare_and_exchange_acq (__memp, \
__oldval \
+ __value, \
__oldval), 0));\
\
__oldval; })
#endif
#ifndef atomic_add
# define atomic_add(mem, value) (void) atomic_exchange_and_add (mem, value)
#endif
#ifndef atomic_increment
# define atomic_increment(mem) atomic_add (mem, 1)
#endif
#ifndef atomic_increment_and_test
# define atomic_increment_and_test(mem) \
(atomic_exchange_and_add (mem, 1) == 0)
#endif
#ifndef atomic_decrement
# define atomic_decrement(mem) atomic_add (mem, -1)
#endif
#ifndef atomic_decrement_and_test
# define atomic_decrement_and_test(mem) \
(atomic_exchange_and_add (mem, -1) == 0)
#endif
/* Decrement *MEM if it is > 0, and return the old value. */
#ifndef atomic_decrement_if_positive
# define atomic_decrement_if_positive(mem) \
({ __typeof (*mem) __val; \
__typeof (*mem) __oldval; \
__typeof (mem) __memp; \
\
__val = *__memp; \
do \
{ \
if (__builtin_expect (__val <= 0, 0)) \
break; \
__oldval = __val; \
__val = atomic_compare_and_exchange_acq (__memp, __oldval - 1, \
__oldval); \
} \
while (__builtin_expect (__val != __oldval, 0)); \
__val; })
#endif
#ifndef atomic_add_negative
# define atomic_add_negative(mem, value) \
(atomic_exchange_and_add (mem, value) < 0)
#endif
#ifndef atomic_add_zero
# define atomic_add_zero(mem, value) \
(atomic_exchange_and_add (mem, value) == 0)
#endif
#ifndef atomic_bit_set
# define atomic_bit_set(mem, bit) \
(void) atomic_bit_test_set(mem, bit)
#endif
#ifndef atomic_bit_test_set
# define atomic_bit_test_set(mem, bit) \
({ __typeof (*mem) __oldval; \
__typeof (mem) __memp = (mem); \
__typeof (*mem) __mask = (1 << (bit)); \
\
do \
__oldval = (*__memp); \
while (__builtin_expect (atomic_compare_and_exchange_acq (__memp, \
__oldval \
| __mask, \
__oldval), 0));\
\
__oldval & __mask; })
#endif
#ifndef atomic_full_barrier
# define atomic_full_barrier() __asm ("" ::: "memory")
#endif
#ifndef atomic_read_barrier
# define atomic_read_barrier() atomic_full_barrier()
#endif
#ifndef atomic_write_barrier
# define atomic_write_barrier() atomic_full_barrier()
#endif
#endif /* atomic.h */
|
