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Diffstat (limited to '')
| -rw-r--r-- | sql/sql_manager.cc | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/sql/sql_manager.cc b/sql/sql_manager.cc new file mode 100644 index 00000000..3d3728b9 --- /dev/null +++ b/sql/sql_manager.cc @@ -0,0 +1,164 @@ +/* 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 02110-1335 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 "mariadb.h" +#include "sql_priv.h" +#include "sql_manager.h" +#include "sql_base.h" // flush_tables + +static bool volatile manager_thread_in_use = 0; +static bool abort_manager = false; + +pthread_t manager_thread; +mysql_mutex_t LOCK_manager; +mysql_cond_t COND_manager; + +struct handler_cb { + struct handler_cb *next; + void (*action)(void *); + void *data; +}; + +static struct handler_cb *cb_list; // protected by LOCK_manager + +bool mysql_manager_submit(void (*action)(void *), void *data) +{ + bool result= FALSE; + DBUG_ASSERT(manager_thread_in_use); + struct handler_cb **cb; + mysql_mutex_lock(&LOCK_manager); + cb= &cb_list; + while (*cb) + cb= &(*cb)->next; + *cb= (struct handler_cb *)my_malloc(PSI_INSTRUMENT_ME, + sizeof(struct handler_cb), MYF(MY_WME)); + if (!*cb) + result= TRUE; + else + { + (*cb)->next= NULL; + (*cb)->action= action; + (*cb)->data= data; + } + mysql_cond_signal(&COND_manager); + 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; + my_thread_init(); + DBUG_ENTER("handle_manager"); + + pthread_detach_this_thread(); + manager_thread = pthread_self(); + mysql_mutex_lock(&LOCK_manager); + while (!abort_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 && !cb_list) + error= mysql_cond_timedwait(&COND_manager, &LOCK_manager, &abstime); + + if (error == ETIMEDOUT || error == ETIME) + { + tc_purge(); + error = 0; + reset_flush_time = TRUE; + } + } + else + { + while ((!error || error == EINTR) && !abort_manager && !cb_list) + error= mysql_cond_wait(&COND_manager, &LOCK_manager); + } + + struct handler_cb *cb= cb_list; + cb_list= NULL; + mysql_mutex_unlock(&LOCK_manager); + + while (cb) + { + struct handler_cb *next= cb->next; + cb->action(cb->data); + my_free(cb); + cb= next; + } + mysql_mutex_lock(&LOCK_manager); + } + manager_thread_in_use = 0; + mysql_mutex_unlock(&LOCK_manager); + 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; + { + pthread_t hThread; + int err; + DBUG_EXECUTE_IF("delay_start_handle_manager", my_sleep(1000);); + manager_thread_in_use = 1; + mysql_cond_init(key_COND_manager, &COND_manager,NULL); + mysql_mutex_init(key_LOCK_manager, &LOCK_manager, NULL); + if ((err= mysql_thread_create(key_thread_handle_manager, &hThread, + &connection_attrib, handle_manager, 0))) + sql_print_warning("Can't create handle_manager thread (errno: %M)", err); + } + DBUG_VOID_RETURN; +} + + +/* Initiate shutdown of handle manager thread */ +void stop_handle_manager() +{ + DBUG_ENTER("stop_handle_manager"); + if (manager_thread_in_use) + { + mysql_mutex_lock(&LOCK_manager); + abort_manager = true; + DBUG_PRINT("quit", ("initiate shutdown of handle manager thread: %lu", + (ulong)manager_thread)); + mysql_cond_signal(&COND_manager); + mysql_mutex_unlock(&LOCK_manager); + } + DBUG_VOID_RETURN; +} + |