if (xbt_swag_size(sd_global->done_task_set) < sd_global->task_number){
XBT_WARN("Simulation is finished but %d tasks are still not done",
(sd_global->task_number - xbt_swag_size(sd_global->done_task_set)));
if (xbt_swag_size(sd_global->done_task_set) < sd_global->task_number){
XBT_WARN("Simulation is finished but %d tasks are still not done",
(sd_global->task_number - xbt_swag_size(sd_global->done_task_set)));