process control block

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1. Presentation on process control block VIKAS KUMAR SHRIVASTAVA BCA HONOURS First Year BCAH1CA-16023 1

2. What is process control block ? 2

3. Process Control Block Each & every process in the operating system is represented by PROCESS CONTROL BLOCK. Process Control Block also known as Task Controlling Block or Process Table. 3

4. Process Control Block Its is a data structure in the operating system kernel containing the information needed to manage a particular process. The PCB is “ the manifestation(visible) of a process in an operating system” 4

5. Block diagram of PCB 5

6. PROCESS CONTROL BLOCK (PCB) PCB consist of following information~ Pointer . Process state . Program counter . CPU register . CPU scheduling information . Memory management information . Accounting information . I/O status information . 6

7. PROCESS CONTROL BLOCK (PCB) POINTER ~ Its contains the address of another process which is present in the ready queue PROCESS STATE ~ Its contains the information about the state of the process i.e., NEW READY RUNNING WAITING HALTED 7

8. PROCESS CONTROL BLOCK (PCB) program COUNTER - The counter specifies the address of the next instruction to be executed. CPU REGISTERS - The register vary in number and type depending in the type of computer architecture, they include : Accumulators, index register, stack pointer and general purpose registers 8

9. PROCESS CONTROL BLOCK (PCB) CPU SHEDULING INFORMATION – This information includes Process priority Pointer to scheduling queues Other scheduling parameters . MEMORY MANAGEMENT INFORMATION – This information includes Value of base and limit of registers Page tables Segment tables Depending on the memory system used by the operating system. 9

10. PROCESS CONTROL BLOCK (PCB) ACCOUNTING INFORMATION – This information includes amount of CPU and real time used time limit account number job or process number etc. I/O STATUS INFORMATION - This information includes list of I/O devices allocated to the process list of open files etc. Hence, the PCB serves as the repository for any information that may be vary from process to process. 10

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