Method free_cache

sql/sql_cache.cc:2801–2839

*/

void Query_cache::free_cache()
{
  DBUG_ENTER("Query_cache::free_cache");

  DBUG_ASSERT(m_cache_lock_status == LOCKED_NO_WAIT ||
              m_cache_status == DISABLE_REQUEST);

  /* Destroy locks */
  Query_cache_block *block= queries_blocks;
  if (block)
  {
    do
    {
      Query_cache_query *query= block->query();
      /*
         There will not be new requests but some maybe not finished yet,
         so wait for them by trying lock/unlock
      */
      BLOCK_LOCK_WR(block);
      BLOCK_UNLOCK_WR(block);

      mysql_rwlock_destroy(&query->lock);
      block= block->next;
    } while (block != queries_blocks);
  }

#if defined(DBUG_OFF) && defined(HAVE_MADVISE) &&  defined(MADV_DODUMP)
  if (madvise(cache, query_cache_size+additional_data_size, MADV_DODUMP))
  {
    DBUG_PRINT("warning", ("coudn't mark query cache memory as " DODUMP_STR ": %s",
			 strerror(errno)));
  }
#endif
  my_free(cache);
  make_disabled();
  my_hash_free(&queries);
  my_hash_free(&tables);
  DBUG_VOID_RETURN;
}

/*****************************************************************************
  Free block data