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130 lines
4.1 KiB
130 lines
4.1 KiB
5 months ago
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/* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
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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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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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*/
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#include "sql/sql_manager.h"
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#include <errno.h>
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#include <sys/types.h>
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#include <time.h>
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#include "my_compiler.h"
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#include "my_dbug.h"
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#include "my_inttypes.h"
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#include "my_loglevel.h"
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#include "my_systime.h"
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#include "my_thread.h" // my_thread_t
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#include "mysql/components/services/log_builtins.h"
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#include "mysql/components/services/mysql_cond_bits.h"
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#include "mysql/components/services/mysql_mutex_bits.h"
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#include "mysql/psi/mysql_cond.h"
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#include "mysql/psi/mysql_mutex.h"
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#include "mysql/psi/mysql_thread.h"
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#include "mysql_com.h"
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#include "mysqld_error.h"
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#include "sql/log.h"
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#include "sql/mysqld.h" // flush_time
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#include "sql/sql_base.h" // tdc_flush_unused_tables
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static bool volatile manager_thread_in_use;
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static bool abort_manager;
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my_thread_t manager_thread;
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mysql_mutex_t LOCK_manager;
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mysql_cond_t COND_manager;
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extern "C" {
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static void *handle_manager(void *arg MY_ATTRIBUTE((unused))) {
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int error = 0;
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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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{
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DBUG_TRACE;
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manager_thread = my_thread_self();
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manager_thread_in_use = 1;
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for (;;) {
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mysql_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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if (reset_flush_time) {
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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 ((!error || error == EINTR) && !abort_manager)
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error = mysql_cond_timedwait(&COND_manager, &LOCK_manager, &abstime);
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} else {
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while ((!error || error == EINTR) && !abort_manager)
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error = mysql_cond_wait(&COND_manager, &LOCK_manager);
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}
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mysql_mutex_unlock(&LOCK_manager);
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if (abort_manager) break;
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if (is_timeout(error)) {
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tdc_flush_unused_tables();
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error = 0;
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reset_flush_time = true;
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}
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}
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manager_thread_in_use = 0;
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} // Can't use DBUG_RETURN after my_thread_end
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my_thread_end();
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return (NULL);
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}
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} // extern "C"
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/* Start handle manager thread */
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void start_handle_manager() {
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DBUG_TRACE;
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abort_manager = false;
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if (flush_time && flush_time != ~(ulong)0L) {
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my_thread_handle hThread;
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int error;
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if ((error = mysql_thread_create(key_thread_handle_manager, &hThread,
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&connection_attrib, handle_manager, 0)))
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LogErr(WARNING_LEVEL, ER_CANT_CREATE_HANDLE_MGR_THREAD, error);
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}
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}
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/* Initiate shutdown of handle manager thread */
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void stop_handle_manager() {
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DBUG_TRACE;
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abort_manager = true;
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mysql_mutex_lock(&LOCK_manager);
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if (manager_thread_in_use) {
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DBUG_PRINT("quit", ("initiate shutdown of handle manager thread: 0x%lx",
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(ulong)manager_thread));
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mysql_cond_signal(&COND_manager);
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}
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mysql_mutex_unlock(&LOCK_manager);
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}
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