95 lines
3.6 KiB
C++
95 lines
3.6 KiB
C++
/*
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Copyright (c) 2013, 2018, 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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#include <stddef.h>
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#include "mysql/psi/mysql_socket.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" // ER_*
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#include "sql/conn_handler/channel_info.h" // Channel_info
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#include "sql/conn_handler/connection_handler_impl.h"
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#include "sql/conn_handler/connection_handler_manager.h" // Connection_handler_manager
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#include "sql/mysqld.h" // connection_errors_internal
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#include "sql/mysqld_thd_manager.h" // Global_THD_manager
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#include "sql/protocol_classic.h"
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#include "sql/sql_class.h" // THD
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#include "sql/sql_connect.h" // close_connection
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#include "sql/sql_parse.h" // do_command
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#include "sql/sql_thd_internal_api.h" // thd_set_thread_stack
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bool One_thread_connection_handler::add_connection(Channel_info *channel_info) {
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if (my_thread_init()) {
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connection_errors_internal++;
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channel_info->send_error_and_close_channel(ER_OUT_OF_RESOURCES, 0, false);
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Connection_handler_manager::dec_connection_count();
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return true;
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}
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THD *thd = channel_info->create_thd();
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if (thd == NULL) {
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connection_errors_internal++;
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channel_info->send_error_and_close_channel(ER_OUT_OF_RESOURCES, 0, false);
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Connection_handler_manager::dec_connection_count();
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return true;
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}
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thd->set_new_thread_id();
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/*
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handle_one_connection() is normally the only way a thread would
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start and would always be on the very high end of the stack ,
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therefore, the thread stack always starts at the address of the
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first local variable of handle_one_connection, which is thd. We
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need to know the start of the stack so that we could check for
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stack overruns.
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*/
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thd_set_thread_stack(thd, (char *)&thd);
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thd->store_globals();
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mysql_thread_set_psi_id(thd->thread_id());
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mysql_socket_set_thread_owner(
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thd->get_protocol_classic()->get_vio()->mysql_socket);
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Global_THD_manager *thd_manager = Global_THD_manager::get_instance();
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thd_manager->add_thd(thd);
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bool error = false;
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if (thd_prepare_connection(thd))
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error = true; // Returning true causes inc_aborted_connects() to be called.
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else {
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delete channel_info;
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while (thd_connection_alive(thd)) {
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if (do_command(thd)) break;
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}
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end_connection(thd);
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}
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close_connection(thd, 0, false, false);
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thd->release_resources();
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thd_manager->remove_thd(thd);
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Connection_handler_manager::dec_connection_count();
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delete thd;
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return error;
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}
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