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database invalidation invalidate queries only of given database (BUG#1898)

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bell@sanja.is.com.ua
2003-11-20 18:12:49 +02:00
parent 707e7e8992
commit a1ceb1bd04
3 changed files with 41 additions and 8 deletions
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34
sql/sql_cache.cc
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@@ -1151,9 +1151,29 @@ void Query_cache::invalidate(char *db)
if (query_cache_size > 0)
{
DUMP(this);
/* invalidate_table reduce list while only root of list remain */
while (tables_blocks !=0 )
invalidate_table(tables_blocks);
restart_search:
if (tables_blocks)
{
Query_cache_block *curr= tables_blocks;
Query_cache_block *next;
do
{
next= curr->next;
if (strcmp(db, (char*)(curr->table()->db())) == 0)
invalidate_table(curr);
/*
invalidate_table can freed block on which point 'next' (if
table of this block used only in queries which was deleted
by invalidate_table). As far as we do not allocate new blocks
and mark all headers of freed blocks as 'FREE' (even if they are
merged with other blocks) we can just test type of block
to be sure that block is not deleted
*/
if (next->type == Query_cache_block::FREE)
goto restart_search;
curr= next;
} while (curr != tables_blocks);
}
}
STRUCT_UNLOCK(&structure_guard_mutex);
}
@@ -2158,9 +2178,11 @@ void Query_cache::free_memory_block(Query_cache_block *block)
{
DBUG_ENTER("Query_cache::free_memory_block");
block->used=0;
DBUG_PRINT("qcache",("first_block 0x%lx, block 0x%lx, pnext 0x%lx pprev 0x%lx",
(ulong) first_block, (ulong) block,block->pnext,
(ulong) block->pprev));
block->type= Query_cache_block::FREE; // mark block as free in any case
DBUG_PRINT("qcache",
("first_block 0x%lx, block 0x%lx, pnext 0x%lx pprev 0x%lx",
(ulong) first_block, (ulong) block,block->pnext,
(ulong) block->pprev));
if (block->pnext != first_block && block->pnext->is_free())
block = join_free_blocks(block, block->pnext);