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Backport two small cleanups from trunk-iplus tree:

Browse Source 
1) No mutex and no function call if we're not using
plugins.
2) If we're above the table definition cache limit,
delete the oldest unused share, not the share on our hands.

sql/sql_base.cc:
  If we're above the table definition cache limit,
  delete the oldest unused share, not the share on our hands.
sql/sql_lex.cc:
  No mutex and no function call if we're not using
  plugins.
This commit is contained in:
Konstantin Osipov
2010-06-07 18:53:50 +04:00
parent 69f8e58821
commit 29f9fb7a0a
2 changed files with 11 additions and 10 deletions
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14
sql/sql_base.cc
View File

@ -686,7 +686,6 @@ static TABLE_SHARE
void release_table_share(TABLE_SHARE *share)
{
bool to_be_deleted= 0;
DBUG_ENTER("release_table_share");
DBUG_PRINT("enter",
("share: 0x%lx table: %s.%s ref_count: %u version: %lu",
@ -700,7 +699,7 @@ void release_table_share(TABLE_SHARE *share)
{
if (share->version != refresh_version ||
table_def_shutdown_in_progress)
to_be_deleted=1;
my_hash_delete(&table_def_cache, (uchar*) share);
else
{
/* Link share last in used_table_share list */
@ -712,15 +711,14 @@ void release_table_share(TABLE_SHARE *share)
end_of_unused_share.prev= &share->next;
share->next= &end_of_unused_share;
to_be_deleted= (table_def_cache.records > table_def_size);
if (table_def_cache.records > table_def_size)
{
/* Delete the least used share to preserve LRU order. */
my_hash_delete(&table_def_cache, (uchar*) oldest_unused_share);
}
}
}
if (to_be_deleted)
{
DBUG_PRINT("info", ("Deleting share"));
my_hash_delete(&table_def_cache, (uchar*) share);
}
DBUG_VOID_RETURN;
}