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Fix possible race condition in Query cache.

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unknown 2013-08-05 17:34:38 +03:00
parent 96340a405a
commit 220623572d
1 changed files with 6 additions and 6 deletions
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12
sql/sql_cache.cc
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@ -1312,17 +1312,17 @@ ulong Query_cache::resize(ulong query_cache_size_arg)
{
BLOCK_LOCK_WR(block);
Query_cache_query *query= block->query();
if (query && query->writer())
if (query->writer())
{
/*
Drop the writer; this will cancel any attempts to store
Drop the writer; this will cancel any attempts to store
the processed statement associated with this writer.
*/
query->writer()->first_query_block= NULL;
query->writer(0);
refused++;
}
BLOCK_UNLOCK_WR(block);
query->unlock_n_destroy();
block= block->next;
} while (block != queries_blocks);
}
@ -4247,11 +4247,11 @@ my_bool Query_cache::move_by_type(uchar **border,
size_t key_length;
key=query_cache_query_get_key((uchar*) block, &key_length, 0);
my_hash_first(&queries, (uchar*) key, key_length, &record_idx);
// Move table of used tables
memmove((char*) new_block->table(0), (char*) block->table(0),
ALIGN_SIZE(n_tables*sizeof(Query_cache_block_table)));
block->query()->unlock_n_destroy();
block->destroy();
// Move table of used tables
memmove((char*) new_block->table(0), (char*) block->table(0),
ALIGN_SIZE(n_tables*sizeof(Query_cache_block_table)));
new_block->init(len);
new_block->type=Query_cache_block::QUERY;
new_block->used=used;