Answer - Deadlock with one process is not possible. Here is the explanation. A deadlock situation can arise if the following four conditions hold simultaneously in a system. - Mutual Exclusion. - Hold and Wait. - No Preemption. - Circular-wait. It is not possible to have circular wait with only one process, thus failing a necessary condition for Circular wait. There is no second process to form a circle with the first one. So it is not possible to have a deadlock involving only one process.