No Pre-Emption

Duration: 3 min

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Module outline

  1. About Course: About the Course
  2. General Aptitude & Reasoning: Number System, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Speed Time and Distance, Mixture and Alligation, Data Interpretation, Algebra, Probability, Permutation and Combination, Venn Diagram, HCF LCM, Divisibility Rules, Age Problems, Pipe and Cistern, Partnership, Linear Algebra, Sequence and Series (Series), Statistics, Powers and Exponents (Surds and Indices), Arithmetic, Mensuration and Geometry, Calculus, Trigonometry, Vectors, Speed Mathematics and Basic Mathematics, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Analogy, Series (Number and Letter Series) (Numerical Relations and Reasoning), Puzzle Solving (Puzzles), Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Calendar, Seating Arrangements, Coding Decoding, Blood Relations, Directions (Direction Test), Clock, Analytical Reasoning (Counting Figures Reasoning), Ranking, Order and Sequence, Logical Sequence Of Words, Inequality, Data Sufficiency, Cubes & Dices
  3. Computer Networks & Cybersecurity: 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
  4. Programming, Data Structures & Algorithms: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, OOPS with C++, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  5. AI, Machine Learning, Big Data & Cloud: Emerging Tech Trends, Artificial Intelligence, Big Data Systems, Approaches to AI, Search Algorithms, Knowledge Representation, Cloud Computing
  6. Digital Logic & Computer Organization: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, 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. TOC & Compiler: 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, 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
  8. Discrete Mathematics: Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic
  9. Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Unix OS, Linux OS, Distributed Systems
  10. Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management, Object Oriented Technology, HTML Basics, JavaScript-Basics, Java, XML
  11. Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, Data Warehousing & Mining, Enhanced Data Models, NoSQL
  12. Other Recurring CS Topics: Basics of Computer Graphics, 2-D Geometrical Transforms and Viewing, Multimedia
  13. Live Classes: ISRO Live classes
  14. Full Mock Test:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video lecture focuses on the 'No pre-emption' condition in deadlock handling strategies within operating systems. The instructor, Sanchit Jain Sir, breaks down the specific rules governing resource allocation when pre-emption is not strictly forbidden but managed under certain conditions. He explains the step-by-step logic a system follows when a process requests resources: checking availability, checking if another waiting process holds them, and handling the waiting state. The lecture includes visual aids on the slide and hand-drawn diagrams to clarify the flow of resource pre-emption between processes.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor begins by analyzing the slide titled 'No pre-emption'. He reads the first bullet point: 'if a process requests some resources, we first check whether they are available. If they are, we allocate them.' He then moves to the second point, explaining that if resources are not available, the system checks if they are allocated to another process waiting for additional resources. If this condition is met, the system pre-empts the resources from the waiting process and allocates them to the requesting process. To illustrate this, he draws a diagram on the screen with 'R' representing a resource and 'P' representing a process, showing an arrow indicating the transfer of resources from one to the other.

  2. 2:00 – 3:18 02:00-03:18

    The lecture proceeds to the third bullet point: 'If the resources are neither available nor held by a waiting process, the requesting process must wait.' The instructor emphasizes that while waiting, the process's own resources may be pre-empted if another process requests them. He then explains the final condition: a process can only be restarted when it is allocated the new resources it requested and recovers any resources that were pre-empted while it was waiting. He gestures to emphasize the recovery aspect of the process restart, ensuring the student understands that the process must regain its lost resources before continuing execution.

The video provides a detailed walkthrough of the 'No pre-emption' condition in deadlock handling. It clarifies that pre-emption is conditional. The system first checks availability. If unavailable, it looks for a waiting process holding the resource to pre-empt from. If no such process exists, the requester waits. During this wait, the requester is vulnerable to having its own resources taken by others. The process only resumes execution once it secures the requested resources and regains any previously held resources that were taken away. This structured approach ensures that resources are managed efficiently without causing indefinite blocking, balancing the needs of multiple processes in the system effectively.

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