------------------------------------------------------------
revno: 2630.4.33
committer: Dmitry Lenev <dlenev@mysql.com>
branch nick: mysql-6.0-3726-w2
timestamp: Fri 2008-06-20 17:11:20 +0400
message:
  WL#3726 "DDL locking for all metadata objects".

  After-review fixes in progress.

  Minimized dependency of mdl.cc on other modules (particularly
  made it independant of mysql_priv.h) in order to be able
  write unit tests for metadata locking subsystem.


sql/ha_ndbcluster_binlog.cc:
  Use newly introduced MAX_MDLKEY_LENGTH constant for allocating
  buffer for object key for metadata locking subsystem.
sql/log_event.cc:
  Use newly introduced MAX_MDLKEY_LENGTH constant for allocating
  buffer for object key for metadata locking subsystem.
sql/mdl.cc:
  Removed dependency on THD class (and thus on mysql_priv.h)
  by using direct access to members of st_my_thread_var instead
  of accessing THD::killed/enter_cond()/exit_cond().
sql/mdl.h:
  Added MAX_MDLKEY_LENGTH constant to be used for allocating
  buffers for key for metadata locking subsystem.
  Added declarations of server kernel functions used by metadata
  locking subsystem to mdl.h in order to decrease dependency of
  mdl.cc on other files.
sql/mysql_priv.h:
  Moved declaration of notify_thread_having_shared_lock() to the
  mdl.h (also renamed it to make clear in metadata locking code
  that it is a callback to SQL-layer).
sql/sql_base.cc:
  Renamed notify_thread_having_shared_lock() to make it clear
  in metadata locking subsystem code that it is a callback
  to SQL layer.
sql/sql_handler.cc:
  Use newly introduced MAX_MDLKEY_LENGTH constant for allocating
  buffer for object key for metadata locking subsystem.
sql/sql_show.cc:
  Use newly introduced MAX_MDLKEY_LENGTH constant for allocating
  buffer for object key for metadata locking subsystem.