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
|
/*
Copyright (c) 2009, 2010 Sun Microsystems, Inc.
Use is subject to license terms.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
#ifndef PFS_ATOMIC_H
#define PFS_ATOMIC_H
/**
@file storage/perfschema/pfs_atomic.h
Atomic operations (declarations).
*/
#include <my_atomic.h>
/** Helper for atomic operations. */
class PFS_atomic
{
public:
static void init();
static void cleanup();
/** Atomic load. */
static inline int32 load_32(volatile int32 *ptr)
{
int32 result;
rdlock(ptr);
result= my_atomic_load32(ptr);
rdunlock(ptr);
return result;
}
/** Atomic load. */
static inline uint32 load_u32(volatile uint32 *ptr)
{
uint32 result;
rdlock(ptr);
result= (uint32) my_atomic_load32((int32*) ptr);
rdunlock(ptr);
return result;
}
/** Atomic store. */
static inline void store_32(volatile int32 *ptr, int32 value)
{
wrlock(ptr);
my_atomic_store32(ptr, value);
wrunlock(ptr);
}
/** Atomic store. */
static inline void store_u32(volatile uint32 *ptr, uint32 value)
{
wrlock(ptr);
my_atomic_store32((int32*) ptr, (int32) value);
wrunlock(ptr);
}
/** Atomic add. */
static inline int32 add_32(volatile int32 *ptr, int32 value)
{
int32 result;
wrlock(ptr);
result= my_atomic_add32(ptr, value);
wrunlock(ptr);
return result;
}
/** Atomic add. */
static inline uint32 add_u32(volatile uint32 *ptr, uint32 value)
{
uint32 result;
wrlock(ptr);
result= (uint32) my_atomic_add32((int32*) ptr, (int32) value);
wrunlock(ptr);
return result;
}
/** Atomic compare and swap. */
static inline bool cas_32(volatile int32 *ptr, int32 *old_value,
int32 new_value)
{
bool result;
wrlock(ptr);
result= my_atomic_cas32(ptr, old_value, new_value);
wrunlock(ptr);
return result;
}
/** Atomic compare and swap. */
static inline bool cas_u32(volatile uint32 *ptr, uint32 *old_value,
uint32 new_value)
{
bool result;
wrlock(ptr);
result= my_atomic_cas32((int32*) ptr, (int32*) old_value,
(uint32) new_value);
wrunlock(ptr);
return result;
}
private:
static my_atomic_rwlock_t m_rwlock_array[256];
static inline my_atomic_rwlock_t *get_rwlock(volatile void *ptr)
{
/*
Divide an address by 8 to remove alignment,
modulo 256 to fall in the array.
*/
uint index= (((intptr) ptr) >> 3) & 0xFF;
my_atomic_rwlock_t *result= &m_rwlock_array[index];
return result;
}
static inline void rdlock(volatile void *ptr)
{
my_atomic_rwlock_rdlock(get_rwlock(ptr));
}
static inline void wrlock(volatile void *ptr)
{
my_atomic_rwlock_wrlock(get_rwlock(ptr));
}
static inline void rdunlock(volatile void *ptr)
{
my_atomic_rwlock_rdunlock(get_rwlock(ptr));
}
static inline void wrunlock(volatile void *ptr)
{
my_atomic_rwlock_wrunlock(get_rwlock(ptr));
}
};
#endif
|
