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
220
221
222
223
224
225
226
227
228
229
230
231
|
// Copyright (C) 2007 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_MULTITHREADED_OBJECT_EXTENSIOn_CPP
#define DLIB_MULTITHREADED_OBJECT_EXTENSIOn_CPP
#include "multithreaded_object_extension.h"
namespace dlib
{
// ----------------------------------------------------------------------------------------
multithreaded_object::
multithreaded_object (
):
s(m_),
is_running_(false),
should_stop_(false),
threads_started(0)
{
}
// ----------------------------------------------------------------------------------------
multithreaded_object::
~multithreaded_object (
)
{
DLIB_ASSERT(number_of_threads_alive() == 0,
"\tmultithreaded_object::~multithreaded_object()"
<< "\n\tYou have let a multithreaded object destruct itself before terminating its threads"
<< "\n\tthis: " << this
);
}
// ----------------------------------------------------------------------------------------
void multithreaded_object::
clear (
)
{
auto_mutex M(m_);
stop();
wait();
dead_threads.clear();
is_running_ = false;
should_stop_ = false;
}
// ----------------------------------------------------------------------------------------
bool multithreaded_object::
is_running (
) const
{
auto_mutex M(m_);
return is_running_;
}
// ----------------------------------------------------------------------------------------
unsigned long multithreaded_object::
number_of_threads_registered (
) const
{
auto_mutex M(m_);
return thread_ids.size() + dead_threads.size();
}
// ----------------------------------------------------------------------------------------
unsigned long multithreaded_object::
number_of_threads_alive (
) const
{
auto_mutex M(m_);
return threads_started;
}
// ----------------------------------------------------------------------------------------
void multithreaded_object::
wait (
) const
{
auto_mutex M(m_);
DLIB_ASSERT(thread_ids.is_in_domain(get_thread_id()) == false,
"\tvoid multithreaded_object::wait()"
<< "\n\tYou can NOT call this function from one of the threads registered in this object"
<< "\n\tthis: " << this
);
while (threads_started > 0)
s.wait();
}
// ----------------------------------------------------------------------------------------
void multithreaded_object::
start (
)
{
auto_mutex M(m_);
const unsigned long num_threads_registered = dead_threads.size() + thread_ids.size();
// start any dead threads
for (unsigned long i = threads_started; i < num_threads_registered; ++i)
{
if (create_new_thread<multithreaded_object,&multithreaded_object::thread_helper>(*this) == false)
{
should_stop_ = true;
is_running_ = false;
throw thread_error();
}
++threads_started;
}
is_running_ = true;
should_stop_ = false;
s.broadcast();
}
// ----------------------------------------------------------------------------------------
void multithreaded_object::
pause (
)
{
auto_mutex M(m_);
is_running_ = false;
}
// ----------------------------------------------------------------------------------------
void multithreaded_object::
stop (
)
{
auto_mutex M(m_);
should_stop_ = true;
is_running_ = false;
s.broadcast();
}
// ----------------------------------------------------------------------------------------
bool multithreaded_object::
should_stop (
) const
{
auto_mutex M(m_);
DLIB_ASSERT(thread_ids.is_in_domain(get_thread_id()),
"\tbool multithreaded_object::should_stop()"
<< "\n\tYou can only call this function from one of the registered threads in this object"
<< "\n\tthis: " << this
);
while (is_running_ == false && should_stop_ == false)
s.wait();
return should_stop_;
}
// ----------------------------------------------------------------------------------------
multithreaded_object::raii_thread_helper::
raii_thread_helper(
multithreaded_object& self_,
thread_id_type id_
) : self(self_), id(id_){}
multithreaded_object::raii_thread_helper::
~raii_thread_helper()
{
auto_mutex M(self.m_);
if (self.thread_ids.is_in_domain(id))
{
mfp temp;
thread_id_type id_temp;
self.thread_ids.remove(id,id_temp,temp);
// put this thread's registered function back into the dead_threads queue
self.dead_threads.enqueue(temp);
}
--self.threads_started;
// If this is the last thread to terminate then
// signal that that is the case.
if (self.threads_started == 0)
{
self.is_running_ = false;
self.should_stop_ = false;
self.s.broadcast();
}
}
// ----------------------------------------------------------------------------------------
void multithreaded_object::
thread_helper(
)
{
mfp mf;
thread_id_type id = get_thread_id();
// this guy's destructor does all the necessary cleanup in this function
raii_thread_helper raii(*this, id);
// if there is a dead_thread sitting around then pull it
// out and put it into mf
{
auto_mutex M(m_);
if (dead_threads.size() > 0)
{
dead_threads.dequeue(mf);
mfp temp(mf);
thread_ids.add(id,temp);
}
}
if (mf.is_set())
{
// call the registered thread function
mf();
}
}
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_MULTITHREADED_OBJECT_EXTENSIOn_CPP
|
