name : 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