Current File : //usr/include/mysql/server/mysql/service_kill_statement.h
/* Copyright (c) 2013, 2018, MariaDB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
#ifndef MYSQL_SERVICE_KILL_STATEMENT_INCLUDED
#define MYSQL_SERVICE_KILL_STATEMENT_INCLUDED
/**
@file
This service provides functions that allow plugins to support
the KILL statement.
In MySQL support for the KILL statement is cooperative. The KILL
statement only sets a "killed" flag. This function returns the value
of that flag. A thread should check it often, especially inside
time-consuming loops, and gracefully abort the operation if it is
non-zero.
thd_killed(thd)
@return 0 - no KILL statement was issued, continue normally
@return 1 - there was a KILL statement, abort the execution.
thd_kill_level(thd)
@return thd_kill_levels_enum values
*/
#ifdef __cplusplus
extern "C" {
#endif
enum thd_kill_levels {
THD_IS_NOT_KILLED=0,
THD_ABORT_SOFTLY=50, /**< abort when possible, don't leave tables corrupted */
THD_ABORT_ASAP=100, /**< abort asap */
};
extern struct kill_statement_service_st {
enum thd_kill_levels (*thd_kill_level_func)(const MYSQL_THD);
} *thd_kill_statement_service;
/* backward compatibility helper */
#define thd_killed(THD) (thd_kill_level(THD) == THD_ABORT_ASAP)
#ifdef MYSQL_DYNAMIC_PLUGIN
#define thd_kill_level(THD) \
thd_kill_statement_service->thd_kill_level_func(THD)
#else
enum thd_kill_levels thd_kill_level(const MYSQL_THD);
#endif
#ifdef __cplusplus
}
#endif
#endif