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
|
/*---------------------------------------------------------------
* Copyright (c) 1999,2000,2001,2002,2003
* The Board of Trustees of the University of Illinois
* All Rights Reserved.
*---------------------------------------------------------------
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software (Iperf) and associated
* documentation files (the "Software"), to deal in the Software
* without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and
* the following disclaimers.
*
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimers in the documentation and/or other materials
* provided with the distribution.
*
*
* Neither the names of the University of Illinois, NCSA,
* nor the names of its contributors may be used to endorse
* or promote products derived from this Software without
* specific prior written permission.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
* ________________________________________________________________
* National Laboratory for Applied Network Research
* National Center for Supercomputing Applications
* University of Illinois at Urbana-Champaign
* http://www.ncsa.uiuc.edu
* ________________________________________________________________
*
* Condition.h
* by Mark Gates <mgates@nlanr.net>
* -------------------------------------------------------------------
* An abstract class for waiting on a condition variable. If
* threads are not available, this does nothing.
* ------------------------------------------------------------------- */
#ifndef CONDITION_H
#define CONDITION_H
#include "headers.h"
#include "Mutex.h"
#include "util.h"
#if defined( HAVE_POSIX_THREAD )
struct Condition {
pthread_cond_t mCondition;
pthread_mutex_t mMutex;
};
#elif defined( HAVE_WIN32_THREAD )
struct Condition {
HANDLE mCondition;
HANDLE mMutex;
};
#else
struct Condition {
int mCondition;
int mMutex;
};
#endif
struct AwaitMutex {
struct Condition await;
int ready;
};
struct BarrierMutex {
struct Condition await;
struct timeval release_time;
int count;
int timeout;
};
struct ReferenceMutex {
Mutex lock;
int count;
int maxcount;
};
#define Condition_Lock( Cond ) Mutex_Lock( &Cond.mMutex )
#define Condition_Unlock( Cond ) Mutex_Unlock( &Cond.mMutex )
// initialize condition
#if defined( HAVE_POSIX_THREAD )
#define Condition_Initialize( Cond ) do { \
Mutex_Initialize( &(Cond)->mMutex ); \
pthread_cond_init( &(Cond)->mCondition, NULL ); \
} while ( 0 )
#elif defined( HAVE_WIN32_THREAD )
// set all conditions to be broadcast
// unfortunately in Win32 you have to know at creation
// whether the signal is broadcast or not.
#define Condition_Initialize( Cond ) do { \
Mutex_Initialize( &(Cond)->mMutex ); \
(Cond)->mCondition = CreateEvent( NULL, 1, 0, NULL ); \
} while ( 0 )
#else
#define Condition_Initialize( Cond )
#endif
// destroy condition
#if defined( HAVE_POSIX_THREAD )
#define Condition_Destroy( Cond ) do { \
pthread_cond_destroy( &(Cond)->mCondition ); \
Mutex_Destroy( &(Cond)->mMutex ); \
} while ( 0 )
#elif defined( HAVE_WIN32_THREAD )
#define Condition_Destroy( Cond ) do { \
CloseHandle( (Cond)->mCondition ); \
Mutex_Destroy( &(Cond)->mMutex ); \
} while ( 0 )
#else
#define Condition_Destroy( Cond )
#endif
#define Condition_Destroy_Reference(Ref) do { \
Mutex_Destroy(&(Ref)->lock); \
} while ( 0 )
#if defined (HAVE_CLOCK_GETTIME)
#define SETABSTIME(ts, seconds) do { \
clock_gettime(CLOCK_REALTIME, &ts); \
ts.tv_sec += seconds; \
} while (0)
#else
#define SETABSTIME(ts, seconds) do { \
struct timeval t1; \
gettimeofday(&t1, NULL);
ts.tv_sec = t1.tv_sec + inSeconds; \
ts.tv_nsec = t1.tv_sec * 1000; \
} while (0)
#endif
// sleep this thread, waiting for condition signal
#if defined( HAVE_POSIX_THREAD )
#define Condition_Wait( Cond ) pthread_cond_wait( &(Cond)->mCondition, &(Cond)->mMutex )
#elif defined( HAVE_WIN32_THREAD )
// atomically release mutex and wait on condition,
// then re-acquire the mutex
#define Condition_Wait( Cond ) do { \
SignalObjectAndWait( (Cond)->mMutex, (Cond)->mCondition, INFINITE, 0 ); \
Mutex_Lock( &(Cond)->mMutex ); \
} while ( 0 )
#else
#define Condition_Wait( Cond )
#endif
// sleep this thread, waiting for condition signal,
// but bound sleep time by the relative time inSeconds.
#if defined( HAVE_POSIX_THREAD )
#define Condition_TimedWait( Cond, inSeconds ) do { \
struct timespec absTimeout; \
SETABSTIME(absTimeout, inSeconds); \
pthread_cond_timedwait( &(Cond)->mCondition, &(Cond)->mMutex, &absTimeout ); \
} while ( 0 )
#define Condition_TimedLock( Cond, inSeconds ) do { \
struct timespec absTimeout; \
SETABSTIME(absTimeout, inSeconds); \
pthread_mutex_timedlock(&Cond.mMutex, &absTimeout); \
} while ( 0 )
#elif defined( HAVE_WIN32_THREAD )
// atomically release mutex and wait on condition,
// then re-acquire the mutex
#define Condition_TimedWait( Cond, inSeconds ) do { \
SignalObjectAndWait( (Cond)->mMutex, (Cond)->mCondition, inSeconds*1000, false ); \
Mutex_Lock( &(Cond)->mMutex ); \
} while ( 0 )
#else
#define Condition_TimedWait( Cond, inSeconds )
#endif
// send a condition signal to wake one thread waiting on condition
// in Win32, this actually wakes up all threads, same as Broadcast
// use PulseEvent to auto-reset the signal after waking all threads
#if defined( HAVE_POSIX_THREAD )
#define Condition_Signal( Cond ) pthread_cond_signal( &(Cond)->mCondition )
#elif defined( HAVE_WIN32_THREAD )
#define Condition_Signal( Cond ) PulseEvent( (Cond)->mCondition )
#else
#define Condition_Signal( Cond )
#endif
// send a condition signal to wake all threads waiting on condition
#if defined( HAVE_POSIX_THREAD )
#define Condition_Broadcast( Cond ) pthread_cond_broadcast( &(Cond)->mCondition )
#elif defined( HAVE_WIN32_THREAD )
#define Condition_Broadcast( Cond ) PulseEvent( (Cond)->mCondition )
#else
#define Condition_Broadcast( Cond )
#endif
#endif // CONDITION_H
|
