xbt_dynar_t hosts = MSG_hosts_as_dynar();
MSG_process_create("dream_master", dream_master, NULL, xbt_dynar_getfirst_as(hosts, msg_host_t));
xbt_dynar_free(&hosts);
xbt_dynar_t hosts = MSG_hosts_as_dynar();
MSG_process_create("dream_master", dream_master, NULL, xbt_dynar_getfirst_as(hosts, msg_host_t));
xbt_dynar_free(&hosts);