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
|
/* Copyright (C) 2021-2023 Free Software Foundation, Inc.
Contributed by Oracle.
This file is part of GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include "DbeThread.h"
#include "util.h"
#include "vec.h"
static void
cleanup_free_mutex (void* arg) {
// pthread_mutex_t *p_mutex = (pthread_mutex_t *) arg;
// if (p_mutex)
// pthread_mutex_unlock (p_mutex);
}
static void*
thread_pool_loop (void* arg)
{
DbeThreadPool *thrp = (DbeThreadPool*) arg;
Dprintf (DEBUG_THREADS, "thread_pool_loop:%d starting thread=%llu\n",
__LINE__, (unsigned long long) pthread_self ());
/* set my cancel state to 'enabled', and cancel type to 'defered'. */
pthread_setcancelstate (PTHREAD_CANCEL_ENABLE, NULL);
pthread_setcanceltype (PTHREAD_CANCEL_DEFERRED, NULL);
/* set thread cleanup handler */
pthread_cleanup_push (cleanup_free_mutex, (void*) & (thrp->p_mutex));
for (;;)
{
DbeQueue *q = thrp->get_queue ();
if (q)
{ /* a request is pending */
Dprintf (DEBUG_THREADS,
"thread_pool_loop:%d thread=%llu queue=%d start\n",
__LINE__, (unsigned long long) pthread_self (), q->id);
q->func (q->arg);
Dprintf (DEBUG_THREADS,
"thread_pool_loop:%d thread=%llu queue=%d done\n",
__LINE__, (unsigned long long) pthread_self (), q->id);
delete q;
continue;
}
if (thrp->no_new_queues)
{
Dprintf (DEBUG_THREADS, "thread_pool_loop:%d exit thread=%llu\n",
__LINE__, (unsigned long long) pthread_self ());
pthread_exit (NULL);
}
Dprintf (DEBUG_THREADS,
"thread_pool_loop:%d before pthread_cond_wait thread=%llu\n",
__LINE__, (unsigned long long) pthread_self ());
pthread_mutex_lock (&thrp->p_mutex);
pthread_cond_wait (&thrp->p_cond_var, &thrp->p_mutex);
Dprintf (DEBUG_THREADS,
"thread_pool_loop:%d after pthread_cond_wait thread=%llu\n",
__LINE__, (unsigned long long) pthread_self ());
pthread_mutex_unlock (&thrp->p_mutex);
}
// never reached, but we must use it here. See `man pthread_cleanup_push`
pthread_cleanup_pop (0);
}
DbeThreadPool::DbeThreadPool (int _max_threads)
{
static const int DBE_NTHREADS_DEFAULT = 4;
char *s = getenv ("GPROFNG_DBE_NTHREADS");
if (s)
{
max_threads = atoi (s);
if (max_threads < 0)
max_threads = 0;
if (_max_threads > 0 && max_threads < _max_threads)
max_threads = _max_threads;
}
else
{
max_threads = _max_threads;
if (max_threads < 0)
max_threads = DBE_NTHREADS_DEFAULT;
}
Dprintf (DEBUG_THREADS, "DbeThreadPool:%d max_threads %d ---> %d\n",
__LINE__, _max_threads, max_threads);
pthread_mutex_init (&p_mutex, NULL);
pthread_cond_init (&p_cond_var, NULL);
threads = new Vector <pthread_t>(max_threads);
queue = NULL;
last_queue = NULL;
no_new_queues = false;
queues_cnt = 0;
total_queues = 0;
}
DbeThreadPool::~DbeThreadPool ()
{
delete threads;
}
DbeQueue *
DbeThreadPool::get_queue ()
{
pthread_mutex_lock (&p_mutex);
DbeQueue *q = queue;
Dprintf (DEBUG_THREADS,
"get_queue:%d thr: %lld id=%d queues_cnt=%d threads_cnt=%d max_threads=%d\n",
__LINE__, (unsigned long long) pthread_self (),
q ? q->id : -1, queues_cnt, (int) threads->size (), max_threads);
if (q)
{
queue = q->next;
queues_cnt--;
}
pthread_mutex_unlock (&p_mutex);
return q;
}
void
DbeThreadPool::put_queue (DbeQueue *q)
{
if (max_threads == 0)
{
// nothing runs in parallel
q->id = ++total_queues;
Dprintf (DEBUG_THREADS, NTXT ("put_queue:%d thr=%lld max_threads=%d queue (%d) runs on the worked thread\n"),
__LINE__, (unsigned long long) pthread_self (), max_threads, q->id);
q->func (q->arg);
delete q;
return;
}
pthread_mutex_lock (&p_mutex);
// nothing runs in parallel
q->id = ++total_queues;
Dprintf (DEBUG_THREADS, "put_queue:%d thr=%lld max_threads=%d queue (%d)\n",
__LINE__, (unsigned long long) pthread_self (), max_threads, q->id);
if (queue)
{
last_queue->next = q;
last_queue = q;
}
else
{
queue = q;
last_queue = q;
}
queues_cnt++;
Dprintf (DEBUG_THREADS,
"put_queue:%d id=%d queues_cnt=%d threads_cnt=%d max_threads=%d\n",
__LINE__, q->id, queues_cnt, (int) threads->size (), max_threads);
if (queues_cnt > threads->size () && threads->size () < max_threads)
{
pthread_t thr;
int r = pthread_create (&thr, NULL, thread_pool_loop, (void *) this);
Dprintf (DEBUG_THREADS,
"put_queue:%d pthread_create returns %d thr=%llu\n",
__LINE__, r, (unsigned long long) thr);
if (r)
fprintf (stderr, GTXT ("pthread_create failed. errnum=%d (%s)\n"), r,
STR (strerror (r)));
else
threads->append (thr);
}
pthread_cond_signal (&p_cond_var);
pthread_mutex_unlock (&p_mutex);
}
void
DbeThreadPool::wait_queues ()
{
pthread_mutex_lock (&p_mutex);
no_new_queues = true;
pthread_mutex_unlock (&p_mutex);
pthread_cond_broadcast (&p_cond_var);
for (;;) // Run requests on the worked thread too
{
DbeQueue *q = get_queue ();
if (q == NULL)
break;
Dprintf (DEBUG_THREADS, "wait_queues:%d thread=%llu queue=%d start\n",
__LINE__, (unsigned long long) pthread_self (), q->id);
q->func (q->arg);
Dprintf (DEBUG_THREADS, "wait_queues:%d thread=%llu queue=%d done\n",
__LINE__, (unsigned long long) pthread_self (), q->id);
delete q;
}
for (int i = 0, sz = threads->size (); i < sz; i++)
{
void *retval;
pthread_join (threads->get (i), &retval);
}
}
DbeQueue::DbeQueue (int (*_func) (void *arg), void *_arg)
{
func = _func;
arg = _arg;
next = NULL;
}
DbeQueue::~DbeQueue () { }
|
