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Apr 9

State the function of a process control block?

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Apr 9
A process control block (PCB) is a data structure used by an operating system to store information about a specific process. The main functions of a PCB include:

1. Process identification: Each PCB contains a unique identifier for the process, such as a process ID.

2. Process state: The PCB stores the current state of the process, such as running, ready, or waiting.

3. Program counter: The PCB keeps track of the address of the next instruction to be executed by the process.

4. CPU registers: The PCB stores the values of CPU registers for the process, allowing the process to be paused and resumed without losing its state.

5. Process priority: The PCB may store the priority level of the process, which is used by the operating system to determine the order in which processes are executed.

6. Memory management information: The PCB contains information about the memory allocated to the process, such as the base and limit registers.

7. I/O status information: The PCB stores information about any I/O devices that the process is using, such as open files or network connections.

Overall, the PCB plays a crucial role in managing and controlling processes within an operating system, allowing the system to efficiently schedule and execute multiple processes concurrently.

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