> ------------------------------------------------------------
> revno: 2818.1.39
> revision-id: gshchepa@mysql.com-20091201102444-yw166t3audrojo9s
> parent: joro@sun.com-20091127160731-6h2fahbh4409i841
> committer: Gleb Shchepa <gshchepa@mysql.com>
> branch nick: mysql-5.0-bugteam
> timestamp: Tue 2009-12-01 14:24:44 +0400
> message:
>   Bug #38883 (reopened): thd_security_context is not thread safe, crashes?
>   
>   The bug 38816 changed the lock that protects THD::query from
>   LOCK_thread_count to LOCK_thd_data, but didn't update the associated
>   InnoDB functions.
>   
>   1. The innobase_mysql_prepare_print_arbitrary_thd and the
>   innobase_mysql_end_print_arbitrary_thd InnoDB functions have been
>   removed, since now we have a per-thread mutex: now we don't need to wrap
>   several inter-thread access tries to THD::query with a single global
>   LOCK_thread_count lock, so we can simplify the code.
>   
>   2. The innobase_mysql_print_thd function has been modified to lock
>   LOCK_thd_data in direct way.