XBT_VERB("there is at least one cycle in your task graph");
xbt_dynar_foreach(dag,count,task){
if(task->kind != SD_TASK_COMM_E2E && task->predecessors->empty() && task->inputs->empty()){
XBT_VERB("there is at least one cycle in your task graph");
xbt_dynar_foreach(dag,count,task){
if(task->kind != SD_TASK_COMM_E2E && task->predecessors->empty() && task->inputs->empty()){