No Pre-Emption

Duration: 3 min

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Inside: a video lesson and guided study material.

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 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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