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1 office 1 /*---------------------------------------------------------------
2 * Copyright (c) 1999,2000,2001,2002,2003
3 * The Board of Trustees of the University of Illinois
4 * All Rights Reserved.
5 *---------------------------------------------------------------
6 * Permission is hereby granted, free of charge, to any person
7 * obtaining a copy of this software (Iperf) and associated
8 * documentation files (the "Software"), to deal in the Software
9 * without restriction, including without limitation the
10 * rights to use, copy, modify, merge, publish, distribute,
11 * sublicense, and/or sell copies of the Software, and to permit
12 * persons to whom the Software is furnished to do
13 * so, subject to the following conditions:
14 *
15 *
16 * Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and
18 * the following disclaimers.
19 *
20 *
21 * Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimers in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 *
27 * Neither the names of the University of Illinois, NCSA,
28 * nor the names of its contributors may be used to endorse
29 * or promote products derived from this Software without
30 * specific prior written permission.
31 *
32 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
33 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
34 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
35 * NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT
36 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
37 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
38 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE
39 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 * ________________________________________________________________
41 * National Laboratory for Applied Network Research
42 * National Center for Supercomputing Applications
43 * University of Illinois at Urbana-Champaign
44 * http://www.ncsa.uiuc.edu
45 * ________________________________________________________________
46 *
47 * Condition.h
48 * by Mark Gates <mgates@nlanr.net>
49 * -------------------------------------------------------------------
50 * An abstract class for waiting on a condition variable. If
51 * threads are not available, this does nothing.
52 * ------------------------------------------------------------------- */
53  
54 #ifndef CONDITION_H
55 #define CONDITION_H
56  
57 #include "headers.h"
58 #include "Mutex.h"
59 #include "util.h"
60  
61 #if defined( HAVE_POSIX_THREAD )
62 typedef struct Condition {
63 pthread_cond_t mCondition;
64 pthread_mutex_t mMutex;
65 } Condition;
66 #elif defined( HAVE_WIN32_THREAD )
67 typedef struct Condition {
68 HANDLE mCondition;
69 HANDLE mMutex;
70 } Condition;
71 #else
72 typedef struct Condition {
73 int mCondition;
74 int mMutex;
75 } Condition;
76 #endif
77  
78 #define Condition_Lock( Cond ) Mutex_Lock( &Cond.mMutex )
79  
80 #define Condition_Unlock( Cond ) Mutex_Unlock( &Cond.mMutex )
81  
82 // initialize condition
83 #if defined( HAVE_POSIX_THREAD )
84 #define Condition_Initialize( Cond ) do { \
85 Mutex_Initialize( &(Cond)->mMutex ); \
86 pthread_cond_init( &(Cond)->mCondition, NULL ); \
87 } while ( 0 )
88 #elif defined( HAVE_WIN32_THREAD )
89 // set all conditions to be broadcast
90 // unfortunately in Win32 you have to know at creation
91 // whether the signal is broadcast or not.
92 #define Condition_Initialize( Cond ) do { \
93 Mutex_Initialize( &(Cond)->mMutex ); \
94 (Cond)->mCondition = CreateEvent( NULL, 1, 0, NULL ); \
95 } while ( 0 )
96 #else
97 #define Condition_Initialize( Cond )
98 #endif
99  
100 // destroy condition
101 #if defined( HAVE_POSIX_THREAD )
102 #define Condition_Destroy( Cond ) do { \
103 pthread_cond_destroy( &(Cond)->mCondition ); \
104 Mutex_Destroy( &(Cond)->mMutex ); \
105 } while ( 0 )
106 #elif defined( HAVE_WIN32_THREAD )
107 #define Condition_Destroy( Cond ) do { \
108 CloseHandle( (Cond)->mCondition ); \
109 Mutex_Destroy( &(Cond)->mMutex ); \
110 } while ( 0 )
111 #else
112 #define Condition_Destroy( Cond )
113 #endif
114  
115 // sleep this thread, waiting for condition signal
116 #if defined( HAVE_POSIX_THREAD )
117 #define Condition_Wait( Cond ) pthread_cond_wait( &(Cond)->mCondition, &(Cond)->mMutex )
118 #elif defined( HAVE_WIN32_THREAD )
119 // atomically release mutex and wait on condition,
120 // then re-acquire the mutex
121 #define Condition_Wait( Cond ) do { \
122 SignalObjectAndWait( (Cond)->mMutex, (Cond)->mCondition, INFINITE, 0 ); \
123 Mutex_Lock( &(Cond)->mMutex ); \
124 } while ( 0 )
125 #else
126 #define Condition_Wait( Cond )
127 #endif
128  
129 // sleep this thread, waiting for condition signal,
130 // but bound sleep time by the relative time inSeconds.
131 #if defined( HAVE_POSIX_THREAD )
132 #define Condition_TimedWait( Cond, inSeconds ) do { \
133 struct timespec absTimeout; \
134 absTimeout.tv_sec = time( NULL ) + inSeconds; \
135 absTimeout.tv_nsec = 0; \
136 pthread_cond_timedwait( &(Cond)->mCondition, &(Cond)->mMutex, &absTimeout ); \
137 } while ( 0 )
138 #elif defined( HAVE_WIN32_THREAD )
139 // atomically release mutex and wait on condition,
140 // then re-acquire the mutex
141 #define Condition_TimedWait( Cond, inSeconds ) do { \
142 SignalObjectAndWait( (Cond)->mMutex, (Cond)->mCondition, inSeconds*1000, false ); \
143 Mutex_Lock( &(Cond)->mMutex ); \
144 } while ( 0 )
145 #else
146 #define Condition_TimedWait( Cond, inSeconds )
147 #endif
148  
149 // send a condition signal to wake one thread waiting on condition
150 // in Win32, this actually wakes up all threads, same as Broadcast
151 // use PulseEvent to auto-reset the signal after waking all threads
152 #if defined( HAVE_POSIX_THREAD )
153 #define Condition_Signal( Cond ) pthread_cond_signal( &(Cond)->mCondition )
154 #elif defined( HAVE_WIN32_THREAD )
155 #define Condition_Signal( Cond ) PulseEvent( (Cond)->mCondition )
156 #else
157 #define Condition_Signal( Cond )
158 #endif
159  
160 // send a condition signal to wake all threads waiting on condition
161 #if defined( HAVE_POSIX_THREAD )
162 #define Condition_Broadcast( Cond ) pthread_cond_broadcast( &(Cond)->mCondition )
163 #elif defined( HAVE_WIN32_THREAD )
164 #define Condition_Broadcast( Cond ) PulseEvent( (Cond)->mCondition )
165 #else
166 #define Condition_Broadcast( Cond )
167 #endif
168  
169 #endif // CONDITION_H