mirror of
https://github.com/MariaDB/server.git
synced 2025-11-03 14:33:32 +03:00
134 lines
3.3 KiB
C++
134 lines
3.3 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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struct handler_cb {
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struct handler_cb *next;
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void (*action)(void);
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};
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static struct handler_cb * volatile cb_list;
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bool mysql_manager_submit(void (*action)())
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{
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bool result= FALSE;
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struct handler_cb * volatile *cb;
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pthread_mutex_lock(&LOCK_manager);
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cb= &cb_list;
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while (*cb && (*cb)->action != action)
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cb= &(*cb)->next;
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if (!*cb)
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{
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*cb= (struct handler_cb *)my_malloc(sizeof(struct handler_cb), MYF(MY_WME));
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if (!*cb)
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result= TRUE;
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else
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{
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(*cb)->next= NULL;
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(*cb)->action= action;
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}
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}
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pthread_mutex_unlock(&LOCK_manager);
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return result;
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}
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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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struct handler_cb *cb= NULL;
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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 || error == EINTR) && !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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{
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while (!manager_status && (!error || error == EINTR) && !abort_loop)
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error= pthread_cond_wait(&COND_manager, &LOCK_manager);
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}
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status = manager_status;
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manager_status = 0;
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if (cb == NULL)
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{
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cb= cb_list;
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cb_list= NULL;
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}
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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 || error == ETIME)
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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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while (cb)
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{
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struct handler_cb *next= cb->next;
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cb->action();
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my_free((gptr)cb, MYF(0));
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cb= next;
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}
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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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