Q. Explain about diffrent Process State?

Process State

• When process executes, it changes its state. Process state is defined as the current activity of the process. Fig belowdisplays the general form of the process state transition diagram. Process state comprises five states. Each process is in one of the states. The states are listed below.

1.  New

2.  Ready

3.  Running

4.  Waiting

5.  Terminated (exist)

1.  New: A process that has just been created.

2. Ready: Ready processes are waiting to have processor allocated to them by the operating system so that they can run.

3.  Running: Process which is currently being executed. A running process possesses all resources required for its execution comprising the processor.

4.  Waiting: A process which can't execute till some event takes place like the completion of an I/O operation. The running process can become suspended by invoking an I/O module.

5.  Terminated: A process that has been released from the pool of executable processes by operating system.

Diagram for Process State

• Whenever processes changes state, the operating system reacts by placing the process PCB in the list that corresponds to its new state. Only one process can be running on any processor at any instant and many processes may be ready and waiting state.