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
|
/**
* Many similar implementations exist. See for example libwsbm
* or the linux kernel include/atomic.h
*
* No copyright claimed on this file.
*
*/
#ifndef P_ATOMIC_H
#define P_ATOMIC_H
#include "p_compiler.h"
#include "p_defines.h"
#ifdef __cplusplus
extern "C" {
#endif
#if (defined(PIPE_CC_GCC))
struct pipe_atomic {
int32_t count;
};
#define p_atomic_set(_v, _i) ((_v)->count = (_i))
#define p_atomic_read(_v) ((_v)->count)
static INLINE boolean
p_atomic_dec_zero(struct pipe_atomic *v)
{
#ifdef __i386__
unsigned char c;
__asm__ __volatile__("lock; decl %0; sete %1":"+m"(v->count), "=qm"(c)
::"memory");
return c != 0;
#else /* __i386__*/
return (__sync_sub_and_fetch(&v->count, 1) == 0);
#endif /* __i386__*/
}
static INLINE void
p_atomic_inc(struct pipe_atomic *v)
{
#ifdef __i386__
__asm__ __volatile__("lock; incl %0":"+m"(v->count));
#else /* __i386__*/
(void) __sync_add_and_fetch(&v->count, 1);
#endif /* __i386__*/
}
static INLINE void
p_atomic_dec(struct pipe_atomic *v)
{
#ifdef __i386__
__asm__ __volatile__("lock; decl %0":"+m"(v->count));
#else /* __i386__*/
(void) __sync_sub_and_fetch(&v->count, 1);
#endif /* __i386__*/
}
static INLINE int32_t
p_atomic_cmpxchg(struct pipe_atomic *v, int32_t old, int32_t new)
{
return __sync_val_compare_and_swap(&v->count, old, new);
}
#else /* (defined(PIPE_CC_GCC)) */
#include "pipe/p_thread.h"
/**
* This implementation should really not be used.
* Add an assembly port instead. It may abort and
* doesn't destroy used mutexes.
*/
struct pipe_atomic {
pipe_mutex mutex;
int32_t count;
};
static INLINE void
p_atomic_set(struct pipe_atomic *v, int32_t i)
{
int ret;
ret = pipe_mutex_init(v->mutex);
if (ret)
abort();
pipe_mutex_lock(v->mutex);
v->count = i;
pipe_mutex_unlock(v->mutex);
}
static INLINE int32_t
p_atomic_read(struct pipe_atomic *v)
{
int32_t ret;
pipe_mutex_lock(v->mutex);
ret = v->count;
pipe_mutex_unlock(v->mutex);
return ret;
}
static INLINE void
p_atomic_inc(struct pipe_atomic *v)
{
pipe_mutex_lock(v->mutex);
++v->count;
pipe_mutex_unlock(v->mutex);
}
static INLINE void
p_atomic_dec(struct pipe_atomic *v)
{
pipe_mutex_lock(v->mutex);
--v->count;
pipe_mutex_unlock(v->mutex);
}
static INLINE boolean
p_atomic_dec_zero(struct pipe_atomic *v)
{
boolean ret;
pipe_mutex_lock(v->mutex);
ret = (--v->count == 0);
pipe_mutex_unlock(v->mutex);
return ret;
}
static INLINE int32_t
p_atomic_cmpxchg(struct pipe_atomic *v, int32_t old, int32_t new)
{
int32_t ret;
pipe_mutex_lock(v->mutex);
ret = v->count;
if (ret == old)
v->count = new;
pipe_mutex_unlock(v->mutex);
return ret;
}
#endif /* (defined(PIPE_CC_GCC)) */
#ifdef __cplusplus
}
#endif
#endif /* P_ATOMIC_H */
|
