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Merge bk-internal.mysql.com:/home/bk/mysql-5.0-runtime

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into  mockturtle.local:/home/dlenev/src/mysql-5.0-bg25044


sql/sql_table.cc:
  Auto merged
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unknown
2007-01-20 14:10:20 +03:00
parent 6c6a2785e9 ac5e6f60a8
commit a854d46cef
5 changed files with 162 additions and 39 deletions
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25
sql/sql_table.cc
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@ -3163,19 +3163,30 @@ view_err:
if (!(alter_info->flags & ~(ALTER_RENAME | ALTER_KEYS_ONOFF)) &&
!table->s->tmp_table) // no need to touch frm
{
VOID(pthread_mutex_lock(&LOCK_open));
switch (alter_info->keys_onoff) {
case LEAVE_AS_IS:
error= 0;
break;
case ENABLE:
/*
wait_while_table_is_used() ensures that table being altered is
opened only by this thread and that TABLE::TABLE_SHARE::version
of TABLE object corresponding to this table is 0.
The latter guarantees that no DML statement will open this table
until ALTER TABLE finishes (i.e. until close_thread_tables())
while the fact that the table is still open gives us protection
from concurrent DDL statements.
*/
VOID(pthread_mutex_lock(&LOCK_open));
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN);
VOID(pthread_mutex_unlock(&LOCK_open));
error= table->file->enable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
/* COND_refresh will be signaled in close_thread_tables() */
break;
case DISABLE:
VOID(pthread_mutex_lock(&LOCK_open));
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN);
VOID(pthread_mutex_unlock(&LOCK_open));
error=table->file->disable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
/* COND_refresh will be signaled in close_thread_tables() */
break;
@ -3188,6 +3199,16 @@ view_err:
error= 0;
}
VOID(pthread_mutex_lock(&LOCK_open));
/*
Unlike to the above case close_cached_table() below will remove ALL
instances of TABLE from table cache (it will also remove table lock
held by this thread). So to make actual table renaming and writing
to binlog atomic we have to put them into the same critical section
protected by LOCK_open mutex. This also removes gap for races between
access() and mysql_rename_table() calls.
*/
if (!error && (new_name != table_name || new_db != db))
{
thd->proc_info="rename";