process control block example

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This specifies the process state i.e. Figure: process control block PCB Inter-process communication information in PCB. Though the details of these structures are system-dependent, common elements fall in three main categories: Process table contains the information what the operating system must know to manage and control process switching, including the process location and process attributes. Operating system maintains the information to manage process. Thread control block new, ready, running, waiting or terminated. | Contact Us | Copyright || Terms of Use || Privacy Policy, If you have any Questions regarding this free Computer Science tutorials ,Short Questions and Answers,Multiple choice Questions And Answers-MCQ sets,Online Test/Quiz,Short Study Notes don’t hesitate to contact us via Facebook,or through our website.Email us @, Copyright || Terms of Use || Privacy Policy. Question-1 Explain Process Control Block (PCB). OS can count the different parameters like the usage of hard disk, CPU and RAM etc. To implement the process model, the operating system maintains a table (an array of structures) called the process table, with one entry per process, these entries are known as Process Control Block. For example, pointers to other process control blocks inside any process control block allows the creation of those queues of processes in various scheduling states. Data structuring for processes is often done in terms of process control blocks. In multitasking operating systems, the PCB stores data needed for correct and efficient process management. The following are the various information that is contained byprocess control block: Naming the process Pointer: – The process for which we are creating PCB is the structure that the process connects … If there are more than one process, then, PCB also will be more than one according to the process and all the PCB will be in link list. When a process executes, it passes through different states. Process Number. This shows the number of the particular … the program counter, this state information must be saved when an interrupt occurs, to allow the process to be continued correctly afterward. The process control block stores the register content also known as execution content of the processor when it was blocked from running. Every process will get one process control block. Sometimes a process works independently and sometimes some processes work together to achieve a big task. Various fields and information stored in PCB are given as below: In practice, which fields the process table has is highly system dependent, but this figure gives a general idea of the kinds of information needed, You may be interested in: Each process contains some more information other than its address space. Figure above shows some of the more important fields in a typical system. Some of these data items are explained with the help of the given diagram − The following are the data items − Process State. States of a process are as following- Accounting information in PCB. The process control stores many data items that are needed for efficient process management. 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