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------------------------------------------------------------
revno: 2476.1116.1
committer: davi@mysql.com/endora.local
timestamp: Fri 2007-12-14 10:10:19 -0200
message:
DROP TABLE under LOCK TABLES simultaneous to a FLUSH TABLES
WITH READ LOCK (global read lock) can lead to a deadlock.

The solution is to not wait for the global read lock if the
thread is holding any locked tables.

Related to bugs 23713 and 32395. This issues is being fixed
only on 6.0 because it depends on the fix for bug 25858 --
which was fixed only on 6.0.
This commit is contained in:
Konstantin Osipov
2009-11-20 23:12:57 +03:00
parent 1b34d593b5
commit 98c4476b49
3 changed files with 51 additions and 10 deletions
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15
sql/sql_table.cc
View File

@ -1766,7 +1766,8 @@ void write_bin_log(THD *thd, bool clear_error,
If a table is in use, we will wait for all users to free the table
before dropping it
Wait if global_read_lock (FLUSH TABLES WITH READ LOCK) is set.
Wait if global_read_lock (FLUSH TABLES WITH READ LOCK) is set, but
not if under LOCK TABLES.
RETURN
FALSE OK. In this case ok packet is sent to user
@ -1777,7 +1778,7 @@ void write_bin_log(THD *thd, bool clear_error,
bool mysql_rm_table(THD *thd,TABLE_LIST *tables, my_bool if_exists,
my_bool drop_temporary)
{
bool error= FALSE, need_start_waiters= FALSE;
bool error= FALSE, need_start_waiting= FALSE;
Drop_table_error_handler err_handler(thd->get_internal_handler());
DBUG_ENTER("mysql_rm_table");
@ -1785,13 +1786,9 @@ bool mysql_rm_table(THD *thd,TABLE_LIST *tables, my_bool if_exists,
if (!drop_temporary)
{
if ((error= wait_if_global_read_lock(thd, 0, 1)))
{
my_error(ER_TABLE_NOT_LOCKED_FOR_WRITE, MYF(0), tables->table_name);
if (!thd->locked_tables &&
!(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
DBUG_RETURN(TRUE);
}
else
need_start_waiters= TRUE;
}
/*
@ -1804,7 +1801,7 @@ bool mysql_rm_table(THD *thd,TABLE_LIST *tables, my_bool if_exists,
thd->pop_internal_handler();
if (need_start_waiters)
if (need_start_waiting)
start_waiting_global_read_lock(thd);
if (error)