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
|
/* Copyright (C) 2000, 2002, 2005 MySQL AB, 2008-2009 Sun Microsystems, Inc
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
* sql_manager.cc
* This thread manages various maintenance tasks.
*
* o Flushing the tables every flush_time seconds.
* o Berkeley DB: removing unneeded log files.
*/
#include "mysql_priv.h"
static bool volatile manager_thread_in_use;
static bool abort_manager;
pthread_t manager_thread;
mysql_mutex_t LOCK_manager;
mysql_cond_t COND_manager;
struct handler_cb {
struct handler_cb *next;
void (*action)(void);
};
static struct handler_cb * volatile cb_list;
bool mysql_manager_submit(void (*action)())
{
bool result= FALSE;
struct handler_cb * volatile *cb;
mysql_mutex_lock(&LOCK_manager);
cb= &cb_list;
while (*cb && (*cb)->action != action)
cb= &(*cb)->next;
if (!*cb)
{
*cb= (struct handler_cb *)my_malloc(sizeof(struct handler_cb), MYF(MY_WME));
if (!*cb)
result= TRUE;
else
{
(*cb)->next= NULL;
(*cb)->action= action;
}
}
mysql_mutex_unlock(&LOCK_manager);
return result;
}
pthread_handler_t handle_manager(void *arg __attribute__((unused)))
{
int error = 0;
struct timespec abstime;
bool reset_flush_time = TRUE;
struct handler_cb *cb= NULL;
my_thread_init();
DBUG_ENTER("handle_manager");
pthread_detach_this_thread();
manager_thread = pthread_self();
manager_thread_in_use = 1;
for (;;)
{
mysql_mutex_lock(&LOCK_manager);
/* XXX: This will need to be made more general to handle different
* polling needs. */
if (flush_time)
{
if (reset_flush_time)
{
set_timespec(abstime, flush_time);
reset_flush_time = FALSE;
}
while ((!error || error == EINTR) && !abort_manager)
error= mysql_cond_timedwait(&COND_manager, &LOCK_manager, &abstime);
}
else
{
while ((!error || error == EINTR) && !abort_manager)
error= mysql_cond_wait(&COND_manager, &LOCK_manager);
}
if (cb == NULL)
{
cb= cb_list;
cb_list= NULL;
}
mysql_mutex_unlock(&LOCK_manager);
if (abort_manager)
break;
if (error == ETIMEDOUT || error == ETIME)
{
flush_tables();
error = 0;
reset_flush_time = TRUE;
}
while (cb)
{
struct handler_cb *next= cb->next;
cb->action();
my_free((uchar*)cb, MYF(0));
cb= next;
}
}
manager_thread_in_use = 0;
DBUG_LEAVE; // Can't use DBUG_RETURN after my_thread_end
my_thread_end();
return (NULL);
}
/* Start handle manager thread */
void start_handle_manager()
{
DBUG_ENTER("start_handle_manager");
abort_manager = false;
if (flush_time && flush_time != ~(ulong) 0L)
{
pthread_t hThread;
if (mysql_thread_create(key_thread_handle_manager,
&hThread, &connection_attrib, handle_manager, 0))
sql_print_warning("Can't create handle_manager thread");
}
DBUG_VOID_RETURN;
}
/* Initiate shutdown of handle manager thread */
void stop_handle_manager()
{
DBUG_ENTER("stop_handle_manager");
abort_manager = true;
mysql_mutex_lock(&LOCK_manager);
if (manager_thread_in_use)
{
DBUG_PRINT("quit", ("initiate shutdown of handle manager thread: 0x%lx",
(ulong)manager_thread));
mysql_cond_signal(&COND_manager);
}
mysql_mutex_unlock(&LOCK_manager);
DBUG_VOID_RETURN;
}
|
