Function close_thread_table

sql/sql_base.cc:1020–1081

/* move one table to free list */

void close_thread_table(THD *thd, TABLE **table_ptr)
{
  TABLE *table= *table_ptr;
  handler *file= table->file;
  DBUG_ENTER("close_thread_table");
  DBUG_PRINT("tcache", ("table: '%s'.'%s' %p", table->s->db.str,
                        table->s->table_name.str, table));
  DBUG_ASSERT(!file->keyread_enabled());
  DBUG_ASSERT(file->inited == handler::NONE);

  /*
    The metadata lock must be released after giving back
    the table to the table cache.
  */
  DBUG_ASSERT(thd->mdl_context.is_lock_owner(MDL_key::TABLE,
                                             table->s->db.str,
                                             table->s->table_name.str,
                                             MDL_SHARED) ||
              thd->mdl_context.is_lock_warrantee(MDL_key::TABLE,
                                                 table->s->db.str,
                                                 table->s->table_name.str,
                                                 MDL_SHARED));
  table->vcol_cleanup_expr(thd);
  table->mdl_ticket= NULL;

  file->update_global_table_stats();
  file->update_global_index_stats();
  if (unlikely(file->handler_stats) && file->handler_stats->active)
  {
    Exec_time_tracker *tracker;
    if ((tracker= file->get_time_tracker()))
      file->handler_stats->engine_time+= tracker->get_cycles();
    thd->handler_stats.add(file->handler_stats);
  }
  /*
    This lock is needed to allow THD::notify_shared_lock() to
    traverse the thd->open_tables list without having to worry that
    some of the tables are removed from under it
  */

  mysql_mutex_lock(&thd->LOCK_thd_data);
  *table_ptr=table->next;
  mysql_mutex_unlock(&thd->LOCK_thd_data);

  if (! table->needs_reopen())
  {
    /* Avoid having MERGE tables with attached children in table cache. */
    file->extra(HA_EXTRA_DETACH_CHILDREN);
    /* Free memory and reset for next loop. */
    free_field_buffers_larger_than(table, MAX_TDC_BLOB_SIZE);
    file->ha_reset();
  }

  /*
    Do this *before* entering the TABLE_SHARE::tdc.LOCK_table_share
    critical section.
  */
  MYSQL_UNBIND_TABLE(file);