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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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4
sql/sql_parse.cc
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@ -1600,8 +1600,8 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
(int) thread_count, (ulong) thd->query_id,
current_global_status_var->long_query_count,
current_global_status_var->opened_tables,
refresh_version,
cached_open_tables(),
tdc_refresh_version(),
tc_records(),
(uint) (queries_per_second1000 / 1000),
(uint) (queries_per_second1000 % 1000));
#ifdef EMBEDDED_LIBRARY