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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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6
sql/sql_show.cc
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@ -4424,7 +4424,7 @@ static int fill_schema_table_from_frm(THD *thd, TABLE_LIST *tables,
goto end;
}
share= get_table_share_shortlived(thd, &table_list, GTS_TABLE | GTS_VIEW);
share= tdc_acquire_share_shortlived(thd, &table_list, GTS_TABLE | GTS_VIEW);
if (!share)
{
res= 0;
@ -4476,9 +4476,7 @@ static int fill_schema_table_from_frm(THD *thd, TABLE_LIST *tables,
end_share:
mysql_mutex_lock(&LOCK_open);
release_table_share(share);
mysql_mutex_unlock(&LOCK_open);
tdc_release_share(share);
end:
/*