Gate Question

Question

Process control block does not contain

1. Process ID
2. User identification number
3. Registers
4. None of the above

Answer 1

Process Control Block (PCB, also called Task Controlling Block) is a data structure in the operating system kernel containing the information needed to manage the scheduling of a particular process.

Process Control Block generally contains-

• A numeric identifier for the process i.e. pid
• 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.
• Identifier of the parent id i.e. ppid
• user identifier (uid) - id of the user responsible for the process.
• CPU registers-  various register set of CPU where process need to be stored for execution for running state
• A list of I/O devices allocated to the process.
• information of page table, memory limits, segment table depending on memory used by the operating system.etc.

So, Process Control Block does contain Process ID, User Identification Number, Registers.

∴ The answer will be Option D) None of the above

Answer 2

• Process id,registers and user identification number all are PCB attributes . So option d is the answer.