Method unlink_table

sql/sql_cache.cc:3619–3649

void Query_cache::unlink_table(Query_cache_block_table *node)
{
  DBUG_ENTER("Query_cache::unlink_table");
  node->prev->next= node->next;
  node->next->prev= node->prev;
  Query_cache_block_table *neighbour= node->next;
  Query_cache_table *table_block_data= node->parent;
  table_block_data->m_cached_query_count--;

  DBUG_ASSERT(table_block_data->m_cached_query_count >= 0);

  if (neighbour->next == neighbour)
  {
    DBUG_ASSERT(table_block_data->m_cached_query_count == 0);
    /*
      If neighbor is root of list, the list is empty.
      The root of the list is always a table-type block
      which contain exactly one Query_cache_block_table
      node object, thus we can use the block() method
      to calculate the Query_cache_block address.
    */
    Query_cache_block *table_block= neighbour->block();
    double_linked_list_exclude(table_block,
                               &tables_blocks);
    Query_cache_table *header= table_block->table();
    if (header->is_hashed())
      my_hash_delete(&tables,(uchar *) table_block);
    free_memory_block(table_block);
  }
  DBUG_VOID_RETURN;
}

/*****************************************************************************
  Free memory management