task->workstation_list = NULL;
task->computation_amount = NULL;
task->communication_amount = NULL;
task->workstation_list = NULL;
task->computation_amount = NULL;
task->communication_amount = NULL;
xbt_assert0(workstation_count > 0, "workstation_nb must be positive");
task->workstation_nb = workstation_count;
xbt_assert0(workstation_count > 0, "workstation_nb must be positive");
task->workstation_nb = workstation_count;