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
|
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2009 Sun Microsystems, Inc.
* Copyright 2005-2008 Intel Corporation. All Rights Reserved.
*
* 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, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
namespace drizzled {
namespace internal {
class mutex_wrapper
{
private:
pthread_mutex_t the_mutex;
bool locked;
public:
mutex_wrapper(void)
: the_mutex(),
locked(false)
{
(void) pthread_mutex_init(&the_mutex, NULL);
}
~mutex_wrapper(void)
{
if (locked)
unlock();
pthread_mutex_destroy(&the_mutex);
}
void lock(void)
{
pthread_mutex_lock(&the_mutex);
locked=true;
}
void unlock(void)
{
pthread_mutex_unlock(&the_mutex);
locked=false;
}
};
template<typename T, typename D>
class pthread_traits
{
private:
mutex_wrapper my_lock;
public:
typedef T value_type;
pthread_traits() {}
inline value_type add_and_fetch(volatile value_type *value, D addend )
{
my_lock.lock();
*value += addend;
value_type ret= *value;
my_lock.unlock();
return ret;
}
inline value_type fetch_and_add(volatile value_type *value, D addend )
{
my_lock.lock();
value_type ret= *value;
*value += addend;
my_lock.unlock();
return ret;
}
inline value_type fetch_and_increment(volatile value_type *value)
{
my_lock.lock();
value_type ret= *value;
(*value)++;
my_lock.unlock();
return ret;
}
inline value_type fetch_and_decrement(volatile value_type *value)
{
my_lock.lock();
value_type ret= *value;
(*value)--;
my_lock.unlock();
return ret;
}
inline value_type fetch_and_store(volatile value_type *value,
value_type new_value )
{
my_lock.lock();
value_type ret= *value;
*value= new_value;
my_lock.unlock();
return ret;
}
inline bool compare_and_swap(volatile value_type *value,
value_type new_value,
value_type comparand )
{
my_lock.lock();
bool ret= (*value == comparand);
if (ret)
*value= new_value;
my_lock.unlock();
return ret;
}
inline value_type fetch(const volatile value_type *value) const volatile
{
const_cast<pthread_traits *>(this)->my_lock.lock();
value_type ret= *value;
const_cast<pthread_traits *>(this)->my_lock.unlock();
return ret;
}
inline value_type store_with_release(volatile value_type *value,
value_type new_value)
{
my_lock.lock();
*value= new_value;
value_type ret= *value;
my_lock.unlock();
return ret;
}
}; /* pthread_traits */
} /* namespace internal */
} /* namespace drizzled */
|