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MDEV-4702 - Reduce usage of LOCK_open

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Following variables do not require LOCK_open protection anymore:
- table_def_cache (renamed to tdc_hash) is protected by rw-lock
  LOCK_tdc_hash;
- table_def_shutdown_in_progress doesn't need LOCK_open protection;
- last_table_id use atomics;
- TABLE_SHARE::ref_count (renamed to TABLE_SHARE::tdc.ref_count)
  is protected by TABLE_SHARE::tdc.LOCK_table_share;
- TABLE_SHARE::next, ::prev (renamed to tdc.next and tdc.prev),
  oldest_unused_share, end_of_unused_share are protected by
  LOCK_unused_shares;
- TABLE_SHARE::m_flush_tickets (renamed to tdc.m_flush_tickets)
  is protected by TABLE_SHARE::tdc.LOCK_table_share;
- refresh_version (renamed to tdc_version) use atomics.
This commit is contained in:
Sergey Vojtovich
2013-08-14 12:48:50 +04:00
parent b882a3e83e
commit b7f9c89423
25 changed files with 1651 additions and 1247 deletions
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2
sql/sql_table.cc
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@ -2432,7 +2432,7 @@ int mysql_rm_table_no_locks(THD *thd, TABLE_LIST *tables, bool if_exists,
{
char *end;
/*
It could happen that table's share in the table_def_cache
It could happen that table's share in the table definition cache
is the only thing that keeps the engine plugin loaded
(if it is uninstalled and waits for the ref counter to drop to 0).