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Add the thd_kill_statement service that provides read access to the thd->killed flag.
This service will obsolete thd_killed() from the plugin.h, we'll remove this declaration, but keep the function in the sql_class.cc until the text major plugin API version change.
The service can look like this:
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 */ }; #define thd_killed(THD) (thd_kill_level(THD) == THD_ABORT_ASAP) enum thd_kill_levels thd_kill_level(const MYSQL_THD);
it maps the internal bitmap of various kill states into few levels that a plugin needs to care about.
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