Process Control Block

Duration: 5 min

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Inside: a video lesson and guided study material.

Module outline

  1. Communication Round: Vocabulary, Subject Verb Agreement (Verb Noun Agreement), Tenses, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Direct and Indirect Speech, Active Passive Voice (Voice), Verbal Analogy (Word Based Analogy), Articles, Preposition, Conjunction, Sentence Construction, English Writing Ability, Communication Assessment
  2. Quantitative Aptitude: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Speed Time and Distance, Percentage, Average, Powers and Exponents (Surds and Indices), Time and Work, Mensuration and Geometry, Age Problems, Pipe and Cistern, Probability, Profit and Loss, Simple Interest and Compound Interest, Algebra
  3. Analytical and Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Directions (Direction Test), Ranking, Order and Sequence, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Logical Sequence Of Words, Puzzle Solving (Puzzles), Syllogisms, Seating Arrangements, Calendar, Clock, Blood Relations, Cubes & Dices, Venn Diagram, Analytical Reasoning (Counting Figures Reasoning)
  4. Cognizant Gaming Aptitude: Gamified / Game Based Aptitude
  5. Java (Cluster 1): Java
  6. ANSI SQL MySQL (Cluster 1,2,3): SQL
  7. HTML, CSS, JavaScript (Cluster 1,3): HTML, CSS, JavaScript
  8. Python (Cluster 2): Python for Placements by Yash Sir
  9. Cloud Fundamentals (Cluster 2): Emerging Tech Trends
  10. C# (Cluster 3): C#
  11. OOPs: Object Oriented Programming (OOPS)
  12. Technical Assessment (Coding): Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Pseudo Codes
  13. Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  14. DBMS: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  15. Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  16. Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security, Mobile Technology, Cloud Computing and IoT, Cyber and Info Security
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The lecture introduces the Process Control Block (PCB) as the critical data structure used by operating systems to represent and manage processes. Often called a task control block, the PCB serves as a repository for all information that varies from process to process. The instructor details the specific fields contained within a PCB, explaining how they allow the OS to track process state, manage memory, and handle scheduling. Key components include process state, program counter, CPU registers, memory limits, and lists of open files. The discussion emphasizes the importance of saving this state information during interrupts to ensure processes can be resumed correctly.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor begins by defining the PCB, stating on the slide that "Each process is represented in the operating system by a process control block (PCB)." He explains it is a repository for information associated with a specific process. The slide lists fields such as "process state," "process number," "program counter," "registers," "memory limits," and "list of open files." He elaborates on "Process state," noting it can be new, ready, running, waiting, or halted. He defines "Program counter" as indicating the address of the next instruction to be executed. He starts discussing "CPU registers," mentioning they vary in number and type depending on the computer architecture, including accumulators and index registers.

  2. 2:00 – 5:00 02:00-05:00

    The instructor continues explaining "CPU registers," stating that along with the program counter, this state information must be saved when an interrupt occurs. The slide updates to show more detailed categories: "CPU-scheduling information," "Memory-management information," and "Accounting information." He explains that scheduling information includes process priority and pointers to scheduling queues. Memory-management information may include base and limit registers, page tables, or segment tables. Accounting information includes time used, time limits, and account numbers. He also mentions "I/O status information," which includes the list of open files and devices used. He gestures towards the slide, emphasizing how these fields allow the OS to manage resources effectively.

  3. 5:00 – 5:05 05:00-05:05

    The video concludes with the instructor reinforcing the structure of the PCB. The slide shows the "list of open files" and an ellipsis, indicating that the structure can contain additional fields. He summarizes that the PCB is essential for the OS to maintain the context of a process, allowing it to be paused and resumed without losing its state.

The lecture provides a comprehensive overview of the Process Control Block, moving from basic definitions to detailed field descriptions. By categorizing information into scheduling, memory management, and accounting, the instructor illustrates how the OS abstracts process details. This structure is fundamental for context switching and ensuring that multiple processes can run concurrently without interfering with each other's state.

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