Function init_slave

sql/slave.cc:654–755

/* Initialize slave structures */

int init_slave()
{
  DBUG_ENTER("init_slave");
  int error= 0;

#ifdef HAVE_PSI_INTERFACE
  init_slave_psi_keys();
#endif

  if (start_slave_deadlock_handler_thread())
    return 1;

  if (global_rpl_thread_pool.init(opt_slave_parallel_threads))
    return 1;

  slave_background_thread_gtid_loaded= false;
  mysql_manager_submit(bg_rpl_load_gtid_slave_state, NULL);

  // hijacking global_rpl_thread_pool cond here - it's only once on startup
  mysql_mutex_lock(&global_rpl_thread_pool.LOCK_rpl_thread_pool);
  while (!slave_background_thread_gtid_loaded)
    mysql_cond_wait(&global_rpl_thread_pool.COND_rpl_thread_pool,
                    &global_rpl_thread_pool.LOCK_rpl_thread_pool);
  mysql_mutex_unlock(&global_rpl_thread_pool.LOCK_rpl_thread_pool);

  /*
    This is called when mysqld starts. Before client connections are
    accepted. However bootstrap may conflict with us if it does START SLAVE.
    So it's safer to take the lock.
  */

  master_info_index= new Master_info_index;
  if (!master_info_index || master_info_index->init_all_master_info())
  {
    sql_print_error("Failed to initialize multi master structures");
    DBUG_RETURN(1);
  }
  if (!(active_mi= new Master_info(&default_master_connection_name,
                                   relay_log_recovery)) ||
      active_mi->error())
  {
    delete active_mi;
    active_mi= 0;
    sql_print_error("Failed to allocate memory for the Master Info structure");
    goto err;
  }

  if (master_info_index->add_master_info(active_mi, FALSE))
  {
    delete active_mi;
    active_mi= 0;
    goto err;
  }

  /*
    If master_host is not specified, try to read it from the master_info file.
    If master_host is specified, create the master_info file if it doesn't
    exists.