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/* Copyright (C) 2000, 2002, 2005 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., 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"
ulong volatile manager_status;
bool volatile manager_thread_in_use;
pthread_t manager_thread;
pthread_mutex_t LOCK_manager;
pthread_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;
pthread_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;
}
}
pthread_mutex_unlock(&LOCK_manager);
return result;
}
pthread_handler_t handle_manager(void *arg __attribute__((unused)))
{
int error = 0;
ulong status;
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_status = 0;
manager_thread_in_use = 1;
for (;;)
{
pthread_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 (!manager_status && (!error || error == EINTR) && !abort_loop)
error= pthread_cond_timedwait(&COND_manager, &LOCK_manager, &abstime);
}
else
{
while (!manager_status && (!error || error == EINTR) && !abort_loop)
error= pthread_cond_wait(&COND_manager, &LOCK_manager);
}
status = manager_status;
manager_status = 0;
if (cb == NULL)
{
cb= cb_list;
cb_list= NULL;
}
pthread_mutex_unlock(&LOCK_manager);
if (abort_loop)
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;
}
if (status)
DBUG_PRINT("error", ("manager did not handle something: %lx", status));
}
manager_thread_in_use = 0;
my_thread_end();
DBUG_RETURN(NULL);
}
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