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Fix for bug #26380: LOCK TABLES + FLUSH LOGS causes deadlock

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The log tables are by nature PERFORMANCE_SCHEMA tables,
which should not be affected by SET GLOBAL READ_ONLY or FLUSH TABLES
WITH READ LOCK.

The implementation of FLUSH TABLES WITH READ LOCK already ignored log tables.
Now with this patch, the implementation of LOCK TABLE also ignore a
global read lock for log tables, which was the missing symmetry.
This commit is contained in:
ramil/ram@mysql.com/ramil.myoffice.izhnet.ru
2007-06-17 09:56:33 +05:00
parent e0adab8ce7
commit f47b82906d
5 changed files with 54 additions and 6 deletions
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8
sql/sql_base.cc
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@ -4018,6 +4018,11 @@ int lock_tables(THD *thd, TABLE_LIST *tables, uint count, bool *need_reopen)
{
DBUG_ASSERT(thd->lock == 0); // You must lock everything at once
TABLE **start,**ptr;
uint lock_flag= MYSQL_LOCK_NOTIFY_IF_NEED_REOPEN;
/* Don't honor the GLOBAL READ LOCK if called from a logger */
if (logger.is_privileged_thread(thd))
lock_flag|= MYSQL_LOCK_IGNORE_GLOBAL_READ_LOCK;
if (!(ptr=start=(TABLE**) thd->alloc(sizeof(TABLE*)*count)))
DBUG_RETURN(-1);
@ -4046,8 +4051,7 @@ int lock_tables(THD *thd, TABLE_LIST *tables, uint count, bool *need_reopen)
}
if (! (thd->lock= mysql_lock_tables(thd, start, (uint) (ptr - start),
MYSQL_LOCK_NOTIFY_IF_NEED_REOPEN,
need_reopen)))
lock_flag, need_reopen)))
{
if (thd->lex->requires_prelocking())
{