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
|
#ifndef SCM_ATOMICS_INTERNAL_H
#define SCM_ATOMICS_INTERNAL_H
/* Copyright (C) 2016
* Free Software Foundation, Inc.
*
* 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 3 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <stdint.h>
#ifdef HAVE_STDATOMIC_H
#include <stdatomic.h>
static inline uint32_t
scm_atomic_subtract_uint32 (uint32_t *loc, uint32_t arg)
{
atomic_uint_least32_t *a_loc = (atomic_uint_least32_t *) loc;
return atomic_fetch_sub (a_loc, arg);
}
static inline _Bool
scm_atomic_compare_and_swap_uint32 (uint32_t *loc, uint32_t *expected,
uint32_t desired)
{
atomic_uint_least32_t *a_loc = (atomic_uint_least32_t *) loc;
return atomic_compare_exchange_weak (a_loc, expected, desired);
}
static inline void
scm_atomic_set_pointer (void **loc, void *val)
{
atomic_uintptr_t *a_loc = (atomic_uintptr_t *) loc;
atomic_store (a_loc, (uintptr_t) val);
}
static inline void *
scm_atomic_ref_pointer (void **loc)
{
atomic_uintptr_t *a_loc = (atomic_uintptr_t *) loc;
return (void *) atomic_load (a_loc);
}
static inline void
scm_atomic_set_scm (SCM *loc, SCM val)
{
atomic_uintptr_t *a_loc = (atomic_uintptr_t *) loc;
atomic_store (a_loc, SCM_UNPACK (val));
}
static inline SCM
scm_atomic_ref_scm (SCM *loc)
{
atomic_uintptr_t *a_loc = (atomic_uintptr_t *) loc;
return SCM_PACK (atomic_load (a_loc));
}
static inline SCM
scm_atomic_swap_scm (SCM *loc, SCM val)
{
atomic_uintptr_t *a_loc = (atomic_uintptr_t *) loc;
return SCM_PACK (atomic_exchange (a_loc, SCM_UNPACK (val)));
}
static inline _Bool
scm_atomic_compare_and_swap_scm (SCM *loc, SCM *expected, SCM desired)
{
atomic_uintptr_t *a_loc = (atomic_uintptr_t *) loc;
return atomic_compare_exchange_weak (a_loc,
(uintptr_t *) expected,
SCM_UNPACK (desired));
}
#else /* HAVE_STDATOMIC_H */
/* Fallback implementation using locks. */
#include "libguile/threads.h"
static scm_i_pthread_mutex_t atomics_lock = SCM_I_PTHREAD_MUTEX_INITIALIZER;
static inline uint32_t
scm_atomic_subtract_uint32 (uint32_t *loc, uint32_t arg)
{
uint32_t ret;
scm_i_pthread_mutex_lock (&atomics_lock);
ret = *loc;
*loc -= arg;
scm_i_pthread_mutex_unlock (&atomics_lock);
return ret;
}
static inline int
scm_atomic_compare_and_swap_uint32 (uint32_t *loc, uint32_t *expected,
uint32_t desired)
{
int ret;
scm_i_pthread_mutex_lock (&atomics_lock);
if (*loc == *expected)
{
*loc = desired;
ret = 1;
}
else
{
*expected = *loc;
ret = 0;
}
scm_i_pthread_mutex_unlock (&atomics_lock);
return ret;
}
static inline void
scm_atomic_set_pointer (void **loc, void *val)
{
scm_i_pthread_mutex_lock (&atomics_lock);
*loc = val;
scm_i_pthread_mutex_unlock (&atomics_lock);
}
static inline void *
scm_atomic_ref_pointer (void **loc)
{
void *ret;
scm_i_pthread_mutex_lock (&atomics_lock);
ret = *loc;
scm_i_pthread_mutex_unlock (&atomics_lock);
return ret;
}
static inline void
scm_atomic_set_scm (SCM *loc, SCM val)
{
scm_i_pthread_mutex_lock (&atomics_lock);
*loc = val;
scm_i_pthread_mutex_unlock (&atomics_lock);
}
static inline SCM
scm_atomic_ref_scm (SCM *loc)
{
SCM ret;
scm_i_pthread_mutex_lock (&atomics_lock);
ret = *loc;
scm_i_pthread_mutex_unlock (&atomics_lock);
return ret;
}
static inline SCM
scm_atomic_swap_scm (SCM *loc, SCM val)
{
SCM ret;
scm_i_pthread_mutex_lock (&atomics_lock);
ret = *loc;
*loc = val;
scm_i_pthread_mutex_unlock (&atomics_lock);
return ret;
}
static inline int
scm_atomic_compare_and_swap_scm (SCM *loc, SCM *expected, SCM desired)
{
int ret;
scm_i_pthread_mutex_lock (&atomics_lock);
if (*loc == *expected)
{
*loc = desired;
ret = 1;
}
else
{
*expected = *loc;
ret = 0;
}
scm_i_pthread_mutex_unlock (&atomics_lock);
return ret;
}
#endif /* HAVE_STDATOMIC_H */
#endif /* SCM_ATOMICS_INTERNAL_H */
|
