Question

Operating systems in C

17.) The kernel keeps a data structure for each process called the Process Control Block (PCB). When a process is not running, its PCB contains the information that is necessary to restart the process on a CPU. Give examples of information that the PCB must have.

Answer 1

Answer is as follows :

The PCB stands for process control block i.e. used to track the process execution status. PCB contains the information about the process i.e. register , priorities etc.

Some the examples of information that the PCB contains :

• Process state – It stores the respective state of the process.
• Process number – Every process is assigned with a unique id is known as processed which stores the process identifier.
• Register – These are the CPU registers which includes: accumulator, base, registers and general purpose registers.
• Program counter – It stores the counter which contains the address of the next instruction that is to be executed for the process.
• Pointer – It is a stack pointer which is required to be saved when the process is switched from one state to another to retain the current position of the process.
• Memory limits – This field contains the information about memory management system used by operating system. This may include the page tables, segment tables etc.

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