Extend the table definition cache to allow to store definitions of
* views
* stored procedures and functions
* generally, any type of metadata
* the locking mechanism should allow coordination between multiple caches, while
minimizing serialization of threads.
The current TDC API is:
struct TABLE_SHARE
{
TABLE *used_tables;
TABLE *unused_tables;
void *frm_data;
};
/**
Return a table share instance if it's in the cache
The share shall be released to the TDC after it's
not used with tdc_release_share().
*/
TABLE_SHARE *
tdc_find_share(const char *name);
/**
Find or insert a new share. Looks up the share on disk and
reads the .frm.
*/
TABLE_SHARE *
tdc_find_or_insert_share(const char *name);
/**
Should follow each call to tdc_find_share() or
tdc_find_or_insert_share()
*/
void
tdc_release_share(TABLE_SHARE *share);
/**
Remove the share from the TDC.
@precondition The share has no tables associated with it.
*/
void
tdc_remove_share(const char *name);
/**
Move a table from unused_tables to used_tables list
*/
void
tdc_use_table(TABLE_SHARE *share, TABLE *table);
/**
Move the table in the opposite direction.
*/
void
tdc_unuse_table(TABLE_SHARE *share, TABLE *table);
/**
Add a new table to used_tables list.
*/
void
tdc_add_table(TABLE_SHARE *share, TABLE *table);
/**
Remove the table from unused_tables list.
*/
void
tdc_remove_table(TABLE_SHARE *share, TABLE *table);
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