System Queues

Duration: 5 min

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Module outline

  1. About Course: About the Course
  2. Paper 1 | General Studies: State Wise GK
  3. Paper 1 | Information and Communication Technology: Role of Internet and Web Services, Security in Mobile and Wireless Computing
  4. Paper 1 | Current Affairs: GK- Current Affairs
  5. Paper 2 | Discrete Mathematical Structure: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Probability
  6. Paper 2 | Digital Computer Organization And Architecture: Number System, Number Representation, Sequential Circuits, Combinational Circuit, Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Register Transfer and Microoperations, Control Unit Design, Programming the Basic Computer
  7. Paper 2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  8. Paper 2 | Programming Languages & Object-Oriented Programming Concepts: Java, OOPS with C++, Java Fundamentals, Array, String, IO & References
  9. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  10. Paper 2 | Data Structure And Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Minimum Spanning Trees, Advanced Algorithms
  11. Paper 2 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Unix OS
  12. Paper 2 | Theory Of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Complexity Theory
  13. Paper 2 | Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  14. Paper 2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Transaction Management, Concurrency Control, Database Recovery, Database Security & Authorization, Enhanced Data Models
  15. Paper 2 | Computer Network And Information Security: Introduction to CN, Data Communication, Application Layer, Hardware basics, Cyber Threats and Malware Attacks, Network Security, 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
  16. Paper 2 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  17. Paper 2 | Current Trends & Technologies: Emerging Tech Trends, Approaches to AI, Search Algorithms, Game Playing, Knowledge Representation, Planning, Multi Agent Systems, Fuzzy Sets, Natural Language Processing, Artificial Neural Networks, Genetic Algorithms, Artificial Intelligence, Data Warehousing & Mining, Electronic Data Interchange and E-Commerce, Terms & Abbreviations
  18. Paper 2 | Full Length Mock Tests:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The lecture begins by defining the core objectives of process management, specifically distinguishing between multiprogramming and time sharing to optimize system performance. It then transitions to a detailed explanation of scheduling queues, utilizing diagrams to illustrate how processes are organized in memory using linked lists. Finally, the session concludes with a comprehensive queueing diagram that maps out the lifecycle of a process, including transitions to the CPU, I/O operations, and interrupt handling.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor introduces the fundamental goals of process management. The slide displays text stating, "The objective of multiprogramming is to have some process running at all times, to maximize CPU utilization." He further explains that "The objective of time sharing is to switch the CPU among processes so frequently that users can interact with each program while it is running." He emphasizes that a process scheduler selects an available process for execution, noting that in a single-processor system, there is never more than one running process at a time. The text explicitly states, "To meet these objectives, the process scheduler selects an available process (possibly from a set of several available processes) for execution on the CPU."

  2. 2:00 – 5:00 02:00-05:00

    The topic shifts to "Scheduling Queues." The slide text explains that processes entering the system are placed in a "job queue," while those ready to execute reside in a "ready queue." The instructor points to a diagram showing a linked list structure where a "queue header" contains pointers to the "head" and "tail." He highlights that each Process Control Block (PCB) includes a pointer to the next PCB. The diagram also visualizes device queues for resources like "mag tape unit 0" and "disk unit 0," illustrating how processes wait for specific hardware. The text notes, "A ready-queue header contains pointers to the first and final PCBs in the list."

  3. 5:00 – 5:06 05:00-05:06

    The final segment presents a "Queueing-diagram representation of process scheduling." The slide text clarifies that rectangular boxes represent queues, such as the "ready queue" and device queues, while circles represent resources like the "CPU." The instructor actively annotates the diagram, drawing an arrow labeled "exit" from the CPU to show process termination. He also draws a curved arrow from the "I/O" circle back to the "ready queue," demonstrating how a process returns to the ready state after an I/O operation completes. Other boxes in the diagram include "time slice expired," "fork a child," and "wait for an interrupt," showing various state transitions.

The lecture effectively bridges theoretical objectives with practical implementation details. It moves from high-level goals like CPU utilization to the data structures (linked lists) used to manage processes, and finally to the dynamic state transitions depicted in the queueing diagram. This progression helps students understand not just why scheduling happens, but how it is structurally and logically managed within an operating system.

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