122 lines
3.3 KiB
C++
122 lines
3.3 KiB
C++
/* Copyright (c) 2000, 2016, 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 as published by
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the Free Software Foundation; version 2 of the License.
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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 Foundation,
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 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_manager.h"
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#include "my_thread.h" // my_thread_t
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#include "log.h" // sql_print_warning
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#include "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" void *handle_manager(void *arg MY_ATTRIBUTE((unused)))
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{
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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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DBUG_ENTER("handle_manager");
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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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{
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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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{
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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 ((!error || error == EINTR) && !abort_manager)
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error= mysql_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 ((!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)
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break;
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if (error == ETIMEDOUT || error == ETIME)
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{
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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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DBUG_LEAVE; // 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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/* Start handle manager thread */
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void start_handle_manager()
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{
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DBUG_ENTER("start_handle_manager");
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abort_manager = false;
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if (flush_time && flush_time != ~(ulong) 0L)
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{
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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,
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&hThread, &connection_attrib,
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handle_manager, 0)))
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sql_print_warning("Can't create handle_manager thread (errno= %d)",
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error);
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}
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DBUG_VOID_RETURN;
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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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{
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DBUG_ENTER("stop_handle_manager");
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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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{
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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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DBUG_VOID_RETURN;
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}
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