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------------------------------------------------------------
revno: 2630.4.32
committer: Dmitry Lenev <dlenev@mysql.com>
branch nick: mysql-6.0-3726-w2
timestamp: Thu 2008-06-19 16:39:58 +0400
message:
  WL#3726 "DDL locking for all metadata objects".

  After-review fixes in progress.

  Ensure that metadata locking subsystem properly handles
  out-of-memory conditions. Clarified MDL interface by
  separating release of locks and removal of lock requests
  from the context.
This commit is contained in:
Konstantin Osipov
2009-12-02 19:15:40 +03:00
parent bf2aae0487
commit 0a49fd92d9
8 changed files with 199 additions and 84 deletions
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13
sql/mdl.h
View File

@ -44,7 +44,8 @@ enum enum_mdl_type {MDL_SHARED=0, MDL_SHARED_HIGH_PRIO,
/** States which metadata lock request can have. */
enum enum_mdl_state {MDL_PENDING=0, MDL_ACQUIRED, MDL_PENDING_UPGRADE};
enum enum_mdl_state {MDL_INITIALIZED=0, MDL_PENDING,
MDL_ACQUIRED, MDL_PENDING_UPGRADE};
/**
@ -152,6 +153,7 @@ void mdl_init_lock(MDL_LOCK_DATA *lock_data, char *key, int type,
MDL_LOCK_DATA *mdl_alloc_lock(int type, const char *db, const char *name,
MEM_ROOT *root);
void mdl_add_lock(MDL_CONTEXT *context, MDL_LOCK_DATA *lock_data);
void mdl_remove_lock(MDL_CONTEXT *context, MDL_LOCK_DATA *lock_data);
void mdl_remove_all_locks(MDL_CONTEXT *context);
/**
@ -160,7 +162,7 @@ void mdl_remove_all_locks(MDL_CONTEXT *context);
inline void mdl_set_lock_type(MDL_LOCK_DATA *lock_data, enum_mdl_type lock_type)
{
DBUG_ASSERT(lock_data->state == MDL_PENDING);
DBUG_ASSERT(lock_data->state == MDL_INITIALIZED);
lock_data->type= lock_type;
}
@ -170,14 +172,15 @@ bool mdl_acquire_exclusive_locks(MDL_CONTEXT *context);
bool mdl_upgrade_shared_lock_to_exclusive(MDL_CONTEXT *context,
MDL_LOCK_DATA *lock_data);
bool mdl_try_acquire_exclusive_lock(MDL_CONTEXT *context,
MDL_LOCK_DATA *lock_data);
MDL_LOCK_DATA *lock_data,
bool *conflict);
bool mdl_acquire_global_shared_lock(MDL_CONTEXT *context);
bool mdl_wait_for_locks(MDL_CONTEXT *context);
void mdl_release_locks(MDL_CONTEXT *context);
void mdl_release_all_locks_for_name(MDL_CONTEXT *context,
MDL_LOCK_DATA *lock_data);
void mdl_release_and_remove_all_locks_for_name(MDL_CONTEXT *context,
MDL_LOCK_DATA *lock_data);
void mdl_release_lock(MDL_CONTEXT *context, MDL_LOCK_DATA *lock_data);
void mdl_downgrade_exclusive_lock(MDL_CONTEXT *context,
MDL_LOCK_DATA *lock_data);