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72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/* Copyright (c) 2013, 2018, MariaDB
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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
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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#ifndef MYSQL_SERVICE_KILL_STATEMENT_INCLUDED
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#define MYSQL_SERVICE_KILL_STATEMENT_INCLUDED
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/**
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@file
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This service provides functions that allow plugins to support
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the KILL statement.
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In MySQL support for the KILL statement is cooperative. The KILL
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statement only sets a "killed" flag. This function returns the value
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of that flag. A thread should check it often, especially inside
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time-consuming loops, and gracefully abort the operation if it is
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non-zero.
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thd_killed(thd)
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@return 0 - no KILL statement was issued, continue normally
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@return 1 - there was a KILL statement, abort the execution.
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thd_kill_level(thd)
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@return thd_kill_levels_enum values
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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enum thd_kill_levels {
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THD_IS_NOT_KILLED=0,
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THD_ABORT_SOFTLY=50, /**< abort when possible, don't leave tables corrupted */
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THD_ABORT_ASAP=100, /**< abort asap */
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};
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extern struct kill_statement_service_st {
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enum thd_kill_levels (*thd_kill_level_func)(const MYSQL_THD);
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} *thd_kill_statement_service;
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/* backward compatibility helper */
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#define thd_killed(THD) (thd_kill_level(THD) == THD_ABORT_ASAP)
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#ifdef MYSQL_DYNAMIC_PLUGIN
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#define thd_kill_level(THD) \
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thd_kill_statement_service->thd_kill_level_func(THD)
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#else
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enum thd_kill_levels thd_kill_level(const MYSQL_THD);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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