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
|
// $Id$
#include "ace/Barrier.h"
#if defined (ACE_HAS_THREADS)
#if !defined (__ACE_INLINE__)
#include "ace/Barrier.inl"
#endif /* __ACE_INLINE__ */
#include "ace/Guard_T.h"
#include "ace/OS_NS_errno.h"
#if defined (ACE_HAS_DUMP)
# include "ace/Log_Msg.h"
#endif /* ACE_HAS_DUMP */
ACE_RCSID (ace,
Barrier,
"$Id$")
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
ACE_ALLOC_HOOK_DEFINE(ACE_Sub_Barrier)
void
ACE_Sub_Barrier::dump (void) const
{
#if defined (ACE_HAS_DUMP)
// ACE_TRACE ("ACE_Sub_Barrier::dump");
ACE_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
this->barrier_finished_.dump ();
ACE_DEBUG ((LM_DEBUG, ACE_LIB_TEXT ("running_threads_ = %d"), this->running_threads_));
ACE_DEBUG ((LM_DEBUG, ACE_LIB_TEXT ("\n")));
ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP));
#endif /* ACE_HAS_DUMP */
}
ACE_Sub_Barrier::ACE_Sub_Barrier (unsigned int count,
ACE_Thread_Mutex &lock,
const ACE_TCHAR *name,
void *arg)
: barrier_finished_ (lock, name, arg),
running_threads_ (count)
{
// ACE_TRACE ("ACE_Sub_Barrier::ACE_Sub_Barrier");
}
ACE_ALLOC_HOOK_DEFINE(ACE_Barrier)
void
ACE_Barrier::dump (void) const
{
#if defined (ACE_HAS_DUMP)
// ACE_TRACE ("ACE_Barrier::dump");
ACE_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
this->lock_.dump ();
ACE_DEBUG ((LM_DEBUG, ACE_LIB_TEXT ("current_generation_ = %d"), this->current_generation_));
ACE_DEBUG ((LM_DEBUG, ACE_LIB_TEXT ("\ncount_ = %d"), this->count_));
this->sub_barrier_1_.dump ();
this->sub_barrier_2_.dump ();
ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP));
#endif /* ACE_HAS_DUMP */
}
ACE_Barrier::ACE_Barrier (unsigned int count,
const ACE_TCHAR *name,
void *arg)
: lock_ (name, (ACE_mutexattr_t *) arg),
current_generation_ (0),
count_ (count),
sub_barrier_1_ (count, lock_, name, arg),
sub_barrier_2_ (count, lock_, name, arg)
{
ACE_TRACE ("ACE_Barrier::ACE_Barrier");
this->sub_barrier_[0] = &this->sub_barrier_1_;
this->sub_barrier_[1] = &this->sub_barrier_2_;
}
int
ACE_Barrier::wait (void)
{
ACE_TRACE ("ACE_Barrier::wait");
ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, -1);
ACE_Sub_Barrier *sbp =
this->sub_barrier_[this->current_generation_];
// Check for shutdown...
if (sbp == 0)
{
errno = ESHUTDOWN;
return -1;
}
int retval = 0;
if (sbp->running_threads_ == 1)
{
// We're the last running thread, so swap generations and tell
// all the threads waiting on the barrier to continue on their
// way.
sbp->running_threads_ = this->count_;
// Swap generations.
this->current_generation_ = 1 - this->current_generation_;
sbp->barrier_finished_.broadcast ();
}
else
{
--sbp->running_threads_;
// Block until all the other threads wait().
while (sbp->running_threads_ != this->count_)
sbp->barrier_finished_.wait ();
// We're awake and the count has completed. See if it completed
// because all threads hit the barrier, or because the barrier
// was shut down.
if (this->sub_barrier_[this->current_generation_] == 0)
{
errno = ESHUTDOWN;
retval = -1;
}
}
return retval;
}
int
ACE_Barrier::shutdown (void)
{
ACE_TRACE ("ACE_Barrier::shutdown");
ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, -1);
ACE_Sub_Barrier *sbp =
this->sub_barrier_[this->current_generation_];
// Check for shutdown...
if (sbp == 0)
{
errno = ESHUTDOWN;
return -1;
}
// Flag the shutdown
this->sub_barrier_[0] = 0;
this->sub_barrier_[1] = 0;
// Tell all the threads waiting on the barrier to continue on their way.
sbp->running_threads_ = this->count_;
sbp->barrier_finished_.broadcast ();
return 0;
}
ACE_ALLOC_HOOK_DEFINE(ACE_Thread_Barrier)
ACE_Thread_Barrier::ACE_Thread_Barrier (unsigned int count,
const ACE_TCHAR *name)
: ACE_Barrier (count, name)
{
// ACE_TRACE ("ACE_Thread_Barrier::ACE_Thread_Barrier");
}
void
ACE_Thread_Barrier::dump (void) const
{
#if defined (ACE_HAS_DUMP)
// ACE_TRACE ("ACE_Thread_Barrier::dump");
ACE_Barrier::dump ();
#endif /* ACE_HAS_DUMP */
}
#if 0
ACE_ALLOC_HOOK_DEFINE(ACE_Process_Barrier)
ACE_Process_Barrier::ACE_Process_Barrier (u_int count,
const ACE_TCHAR *name)
: ACE_Barrier (count, USYNC_PROCESS, name)
{
// ACE_TRACE ("ACE_Process_Barrier::ACE_Process_Barrier");
}
void
ACE_Process_Barrier::dump (void) const
{
#if defined (ACE_HAS_DUMP)
// ACE_TRACE ("ACE_Process_Barrier::dump");
ACE_Barrier::dump ();
#endif /* ACE_HAS_DUMP */
}
#endif /* 0 */
ACE_END_VERSIONED_NAMESPACE_DECL
#endif /* ACE_HAS_THREADS */
|
