sql_manager.cpp
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or
- (at your option) any later version.
- 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"
- #include "sql_manager.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;
- extern "C" pthread_handler_decl(handle_manager,arg __attribute__((unused)))
- {
- int error = 0;
- ulong status;
- struct timespec abstime;
- bool reset_flush_time = TRUE;
- 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 && !abort_loop)
- error = pthread_cond_timedwait(&COND_manager, &LOCK_manager, &abstime);
- }
- else
- while (!manager_status && !error && !abort_loop)
- error = pthread_cond_wait(&COND_manager, &LOCK_manager);
- status = manager_status;
- manager_status = 0;
- pthread_mutex_unlock(&LOCK_manager);
- if (abort_loop)
- break;
- if (error) /* == ETIMEDOUT */
- {
- flush_tables();
- error = 0;
- reset_flush_time = TRUE;
- }
- #ifdef HAVE_BERKELEY_DB
- if (status & MANAGER_BERKELEY_LOG_CLEANUP)
- {
- berkeley_cleanup_log_files();
- status &= ~MANAGER_BERKELEY_LOG_CLEANUP;
- }
- #endif
- if (status)
- DBUG_PRINT("error", ("manager did not handle something: %lx", status));
- }
- manager_thread_in_use = 0;
- my_thread_end();
- DBUG_RETURN(NULL);
- }