Is it possible to have a deadlock situation involving only o

Is it possible to have a deadlock situation involving only one single process? If no, explain your answer. Explain the conditions of a deadlock situation in a system. Consider the following snapshot of a system: Answer the following questions using the banker\'s algorithm. What is the content of the matrix Need? Is the system in a safe state? If so, what is the sequence of processes? If a request from process PI arrives for (0, 4, 2, 0) can the request be granted immediately? Assume the following situation in a system: Illustrate that situation by means of the general resource graph, and use the deadlock detection algorithm to evaluate the resulting system state.

Solution

Ans.1) It is not possible to have a deadlock involving only one single process. The deadlock involves a circular “hold-and-wait” condition between two or more processes, so “one” process cannot hold a resource, yet be waiting for another resource that it is holding. In addition, deadlock is not possible between two threads in a process, because it is the process that holds resources, not the thread that is, each thread has access to the resources held by the process.

Ans.2) Necessary conditions

A deadlock situation can arise if and only if all of the following conditions hold simultaneously in a system^:

Ans.3) a. The values of Need for processes P0 through P4 respectively are (0, 0, 0, 0), (0, 7, 5, 0),
(1,0, 0, 2), (0, 0, 2, 0), and (0, 6, 4, 2).
b. Yes. With Available being equal to (1,5, 2, 0), either process P0 or P3 could run. Once
process P3 runs, it releases its resources, which allow all other existing processes to run.
c. Yes, it can. This results in the value of Available being (1, 1, 0, 0). One ordering of
processes that can finish is P0, P2, P3, P1, and P4.