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
|
/* Copyright (C) 2006 MySQL AB
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; version 2 of the License.
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, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include <drizzled/server_includes.h>
#include <drizzled/gettext.h>
#include <drizzled/error.h>
#include <drizzled/plugin_scheduling.h>
#include <drizzled/connect.h>
#include <drizzled/sql_parse.h>
#include <drizzled/session.h>
#include <drizzled/connect.h>
#include <string>
using namespace std;
pthread_attr_t multi_thread_attrib;
static uint32_t max_threads;
static bool add_connection(Session *session)
{
int error;
safe_mutex_assert_owner(&LOCK_thread_count);
(void) pthread_mutex_unlock(&LOCK_thread_count);
if ((error= pthread_create(&session->real_id, &multi_thread_attrib, handle_one_connection, (void*) session)))
return true;
return false;
}
/*
End connection, in case when we are using 'no-threads'
*/
static bool end_thread(Session *session, bool)
{
unlink_session(session); /* locks LOCK_thread_count and deletes session */
pthread_mutex_unlock(&LOCK_thread_count);
pthread_exit(0);
return true; // We should never reach this point
}
static int init(void *p)
{
scheduling_st* func= (scheduling_st *)p;
func->max_threads= max_threads; /* This will create an upper limit on max connections */
func->add_connection= add_connection;
func->end_thread= end_thread;
/* Parameter for threads created for connections */
(void) pthread_attr_init(&multi_thread_attrib);
(void) pthread_attr_setdetachstate(&multi_thread_attrib,
PTHREAD_CREATE_DETACHED);
pthread_attr_setscope(&multi_thread_attrib, PTHREAD_SCOPE_SYSTEM);
return 0;
}
static int deinit(void *)
{
pthread_attr_destroy(&multi_thread_attrib);
return 0;
}
static DRIZZLE_SYSVAR_UINT(max_threads, max_threads,
PLUGIN_VAR_RQCMDARG,
N_("Maximum number of user threads available."),
NULL, NULL, 2048, 1, 4048, 0);
static struct st_mysql_sys_var* system_variables[]= {
DRIZZLE_SYSVAR(max_threads),
NULL
};
drizzle_declare_plugin(multi_thread)
{
DRIZZLE_SCHEDULING_PLUGIN,
"multi_thread",
"0.1",
"Brian Aker",
"One Thread Perl Session Scheduler",
PLUGIN_LICENSE_GPL,
init, /* Plugin Init */
deinit, /* Plugin Deinit */
NULL, /* status variables */
system_variables, /* system variables */
NULL /* config options */
}
drizzle_declare_plugin_end;
|