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/* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
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 */
/*
* 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 "sql_priv.h"
#include "sql_manager.h"
#include "unireg.h" // REQUIRED: for other includes
#include "sql_base.h" // flush_tables
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;
DBUG_ASSERT(manager_thread_in_use);
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();
mysql_cond_init(key_COND_manager, &COND_manager,NULL);
mysql_mutex_init(key_LOCK_manager, &LOCK_manager, NULL);
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)
{
tdc_flush_unused_tables();
error = 0;
reset_flush_time = TRUE;
}
while (cb)
{
struct handler_cb *next= cb->next;
cb->action();
my_free(cb);
cb= next;
}
}
manager_thread_in_use = 0;
mysql_mutex_destroy(&LOCK_manager);
mysql_cond_destroy(&COND_manager);
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;
int error;
if ((error= mysql_thread_create(key_thread_handle_manager,
&hThread, &connection_attrib,
handle_manager, 0)))
sql_print_warning("Can't create handle_manager thread (errno= %d)",
error);
}
DBUG_VOID_RETURN;
}
/* Initiate shutdown of handle manager thread */
void stop_handle_manager()
{
DBUG_ENTER("stop_handle_manager");
abort_manager = true;
if (manager_thread_in_use)
{
mysql_mutex_lock(&LOCK_manager);
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;
}
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