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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
// -*- C++ -*-
//==========================================================================
/**
* @file Null_Mutex.h
*
* $Id$
*
* Moved from Synch.h.
*
* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
*/
//==========================================================================
#ifndef ACE_NULL_MUTEX_H
#define ACE_NULL_MUTEX_H
#include /**/ "ace/pre.h"
// All methods in this class are inline, so there is no
// need to import or export on Windows. -- CAE 12/18/2003
#include "ace/os_include/os_errno.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Global_Macros.h"
#include "ace/OS_Memory.h"
class ACE_Time_Value;
/**
* @class ACE_Null_Mutex
*
* @brief Implement a do nothing <ACE_Mutex>, i.e., all the methods are
* no ops.
*/
class ACE_Null_Mutex
{
public:
ACE_Null_Mutex (const ACE_TCHAR * = 0)
: lock_ (0) {}
~ACE_Null_Mutex (void) {}
/// Return 0.
int remove (void) {return 0;}
/// Return 0.
int acquire (void) {return 0;}
/// Return -1 with <errno> == <ETIME>.
int acquire (ACE_Time_Value &) {errno = ETIME; return -1;}
/// Return -1 with <errno> == <ETIME>.
int acquire (ACE_Time_Value *) {errno = ETIME; return -1;}
/// Return 0.
int tryacquire (void) {return 0;}
/// Return 0.
int release (void) {return 0;}
/// Return 0.
int acquire_write (void) {return 0;}
/// Return 0.
int tryacquire_write (void) {return 0;}
/// Return 0.
int tryacquire_write_upgrade (void) {return 0;}
/// Return 0.
int acquire_read (void) {return 0;}
/// Return 0.
int tryacquire_read (void) {return 0;}
/// Dump the state of an object.
void dump (void) const {}
/// Declare the dynamic allocation hooks.
//ACE_ALLOC_HOOK_DECLARE;
int lock_; // A dummy lock.
};
#if defined (ACE_USES_OBSOLETE_GUARD_CLASSES)
/**
* @class ACE_Null_Mutex_Guard
*
* @brief This data structure is meant to be used within a method or
* function... It performs automatic aquisition and release of
* an ACE_Null_Mutex.
*
* This class is obsolete and should be replaced by
* ACE_Guard<ACE_Null_Mutex>.
*/
class ACE_Null_Mutex_Guard
{
public:
ACE_Null_Mutex_Guard (ACE_Null_Mutex &) {}
~ACE_Null_Mutex_Guard (void) {}
int remove (void) {return 0;}
int locked (void) {return 1;}
int acquire (void) {return 0;}
int tryacquire (void) {return 0;}
int release (void) {return 0:}
void dump (void) const {}
private:
// = Prevent assignment and initialization.
void operator= (const ACE_Null_Mutex_Guard &);
ACE_Null_Mutex_Guard (const ACE_Null_Mutex_Guard &);
};
#endif /* ACE_USES_OBSOLETE_GUARD_CLASSES */
template <class ACE_LOCK>
class ACE_Guard;
/**
* @class ACE_Guard<ACE_Null_Mutex>
*
* @brief Template specialization of <ACE_Guard> for the
* <ACE_Null_Mutex>.
*
* This specialization is useful since it helps to speedup
* performance of the "Null_Mutex" considerably.
*/
template<>
class ACE_Guard<ACE_Null_Mutex>
{
public:
// = Initialization and termination methods.
ACE_Guard (ACE_Null_Mutex &) {}
ACE_Guard (ACE_Null_Mutex &, int) {}
ACE_Guard (ACE_Null_Mutex &, int, int) {}
#if defined (ACE_WIN32)
~ACE_Guard (void) {}
#endif /* ACE_WIN32 */
int acquire (void) { return 0; }
int tryacquire (void) { return 0; }
int release (void) { return 0; }
void disown (void) {}
int locked (void) { return 1; }
int remove (void) { return 0; }
void dump (void) const {}
private:
// = Prevent assignment and initialization.
ACE_UNIMPLEMENTED_FUNC (void operator= (const ACE_Guard<ACE_Null_Mutex> &))
ACE_UNIMPLEMENTED_FUNC (ACE_Guard (const ACE_Guard<ACE_Null_Mutex> &))
};
template <class ACE_LOCK>
class ACE_Write_Guard;
/**
* @class ACE_Write_Guard<ACE_Null_Mutex>
*
*/
template<>
class ACE_Write_Guard<ACE_Null_Mutex> : public ACE_Guard<ACE_Null_Mutex>
{
public:
ACE_Write_Guard (ACE_Null_Mutex &m)
: ACE_Guard<ACE_Null_Mutex> (m) {}
ACE_Write_Guard (ACE_Null_Mutex &m, int blocked)
: ACE_Guard<ACE_Null_Mutex> (m, blocked) {}
int acquire_write (void) { return 0; }
int acquire (void) { return 0; }
int tryacquire_write (void) { return 0; }
int tryacquire (void) { return 0; }
void dump (void) const {}
};
template <class ACE_LOCK>
class ACE_Read_Guard;
/**
* @class ACE_Read_Guard<ACE_Null_Mutex>
*
*/
template<>
class ACE_Read_Guard<ACE_Null_Mutex> : public ACE_Guard<ACE_Null_Mutex>
{
public:
ACE_Read_Guard (ACE_Null_Mutex &m)
: ACE_Guard<ACE_Null_Mutex> (m) {}
ACE_Read_Guard (ACE_Null_Mutex &m, int blocked)
: ACE_Guard<ACE_Null_Mutex> (m, blocked) {}
int acquire_read (void) { return 0; }
int acquire (void) { return 0; }
int tryacquire_read (void) { return 0; }
int tryacquire (void) { return 0; }
void dump (void) const {}
};
template <class T> class ACE_Malloc_Lock_Adapter_T;
/**
* @class ACE_Malloc_Lock_Adapter_T<ACE_Null_Mutex>
*
*/
template<>
class ACE_Malloc_Lock_Adapter_T<ACE_Null_Mutex>
{
public:
ACE_Null_Mutex * operator () (const ACE_TCHAR *name)
{
ACE_Null_Mutex *p;
ACE_NEW_RETURN (p, ACE_Null_Mutex (name), 0);
return p;
}
};
#include /**/ "ace/post.h"
#endif /* ACE_NULL_MUTEX_H */
|
