if (idx != -1) {
XBT_DEBUG("Peer %s got a 'SEND_DATA' message", sg_mailbox_get_name(p->me));
/* move the last pending comm where the finished one was, and decrement */
if (idx != -1) {
XBT_DEBUG("Peer %s got a 'SEND_DATA' message", sg_mailbox_get_name(p->me));
/* move the last pending comm where the finished one was, and decrement */