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https://github.com/MariaDB/server.git
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95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/*
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* sql_manager.cc
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* This thread manages various maintenance tasks.
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*
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* o Flushing the tables every flush_time seconds.
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* o Berkeley DB: removing unneeded log files.
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*/
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#include "mysql_priv.h"
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#include "sql_manager.h"
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ulong volatile manager_status;
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bool volatile manager_thread_in_use;
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pthread_t manager_thread;
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pthread_mutex_t LOCK_manager;
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pthread_cond_t COND_manager;
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pthread_handler_t handle_manager(void *arg __attribute__((unused)))
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{
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int error = 0;
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ulong status;
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struct timespec abstime;
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bool reset_flush_time = TRUE;
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my_thread_init();
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DBUG_ENTER("handle_manager");
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pthread_detach_this_thread();
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manager_thread = pthread_self();
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manager_status = 0;
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manager_thread_in_use = 1;
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for (;;)
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{
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pthread_mutex_lock(&LOCK_manager);
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/* XXX: This will need to be made more general to handle different
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* polling needs. */
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if (flush_time)
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{
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if (reset_flush_time)
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{
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set_timespec(abstime, flush_time);
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reset_flush_time = FALSE;
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}
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while (!manager_status && !error && !abort_loop)
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error = pthread_cond_timedwait(&COND_manager, &LOCK_manager, &abstime);
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}
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else
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while (!manager_status && !error && !abort_loop)
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error = pthread_cond_wait(&COND_manager, &LOCK_manager);
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status = manager_status;
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manager_status = 0;
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pthread_mutex_unlock(&LOCK_manager);
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if (abort_loop)
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break;
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if (error) /* == ETIMEDOUT */
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{
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flush_tables();
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error = 0;
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reset_flush_time = TRUE;
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}
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#ifdef HAVE_BERKELEY_DB
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if (status & MANAGER_BERKELEY_LOG_CLEANUP)
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{
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berkeley_cleanup_log_files();
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status &= ~MANAGER_BERKELEY_LOG_CLEANUP;
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}
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#endif
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if (status)
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DBUG_PRINT("error", ("manager did not handle something: %lx", status));
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}
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manager_thread_in_use = 0;
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my_thread_end();
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DBUG_RETURN(NULL);
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}
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