A process is unit of work in operating system. A process is a program in execution. The process is different from the program as program is a passive entity which is a file containing the list of instructions stored on the disk whereas process is an active entity with a program counter specifying the next instruction to execute and a set of associated resources. A process includes:
As process executes, it changes its state. By its current activity, the process can be in one of the following state:
It must be noted that only one process can be running on any processor at any instant, other processes may be in ready or waiting state.
Each process is represented in operating system by Process Control Block (PCB). It contains process specific information:
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Punjab Civil Services 2021