Chapter 03
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The document discusses various issues related to deadlocks including: 1) The four conditions required for a deadlock to occur: mutual exclusion, hold and wait, no preemption, and circular wait. 2) Approaches to handling deadlocks such as detection and recovery, avoidance through careful allocation, and prevention by eliminating one of the four conditions. 3) Specific algorithms for deadlock detection, avoidance, and prevention including the banker's algorithm and various graph-based approaches.
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deadlock detection using Goldman's algorithm by ANIKET CHOUDHURY
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Deadlocks
Discuss 4 conditions for deadlocks and 4 deadlock prevention techniques. Solutions like Ostrich Algorithm, and detection techniques with 1 resource type. Deadlock recovery and avoidance.
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A deadlock in OS is a situation in which more than one process is blocked because it is holding a resource and also requires some resource that is acquired by some other process
OS-Part-06.pdf
This document discusses deadlocks, which occur when multiple processes are blocked waiting for resources held by other processes in the system, creating a circular wait. It presents four conditions necessary for deadlock and strategies to prevent or avoid deadlocks, including deadlock detection and recovery, and preventing one of the four conditions through methods like restricting resource allocation or ordering resource requests. The document also covers other related issues like two-phase locking and non-resource deadlocks.
FP 202 Chapter 2 - Part 3
This document discusses deadlocks in operating systems. It defines deadlock as occurring when each process needs a resource held by another process, resulting in a circular wait. Four necessary conditions for deadlock are outlined: mutual exclusion, hold and wait, no preemption, and circular wait. Methods for handling deadlocks include ignoring them, preventing conditions through resource ordering or avoiding unsafe states, and detecting and recovering from deadlocks.
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A deadlock in OS is a situation in which more than one process is blocked because it is holding a resource and also requires some resource that is acquired by some other process
Deadlocks prefinal
This document outlines different methods for handling deadlocks in operating systems, including deadlock prevention, avoidance, detection, and recovery. It discusses the four necessary conditions for deadlock and defines a resource-allocation graph model. For deadlock prevention, it describes ways to ensure that the mutual exclusion, hold and wait, no preemption, and circular wait conditions cannot simultaneously hold through protocols like requesting all resources at start, releasing resources before requesting new ones, preempting held resources, and imposing a total ordering of resource types. Deadlock avoidance uses additional process information to decide if a request should wait. Detection identifies deadlocks in the system state, while recovery terminates processes or preempts resources.
Deadlocksprefinal 161014115456
This document outlines different methods for handling deadlocks in operating systems, including deadlock prevention, avoidance, detection, and recovery. It discusses the four necessary conditions for deadlock and introduces the concept of a resource-allocation graph. For deadlock prevention, it describes ways to ensure that the conditions of mutual exclusion, hold and wait, no preemption, and circular wait do not all occur simultaneously, such as requiring processes to request all resources upfront or imposing a total ordering of resource types. Deadlock avoidance uses additional information about future resource needs to decide if a request can be granted. Detection and recovery methods are employed if deadlocks are allowed to occur.
Operating system Deadlock
1) A deadlock occurs when a set of processes are blocked waiting for resources held by other processes in the set, forming a circular wait.
2) For a deadlock to occur, four necessary conditions must be met: mutual exclusion, hold and wait, no preemption, and circular wait.
3) Deadlocks can be prevented by ensuring that at least one of the four conditions is not met, such as allowing resource preemption or requiring processes request all resources before starting. Deadlock avoidance uses algorithms like Banker's Algorithm to prevent unsafe states that could lead to deadlock.
Deadlocks final
This document summarizes key concepts related to deadlocks in operating systems. It defines the four necessary conditions for deadlock to occur: mutual exclusion, hold and wait, no preemption, and circular wait. It describes methods for handling deadlocks, including deadlock prevention, avoidance, detection, and recovery. Deadlock prevention techniques aim to ensure that at least one of the necessary conditions does not hold, such as imposing an ordering on how resources can be requested. Deadlock avoidance uses additional information to determine if a request could lead to a deadlocked state. Detection and recovery methods allow deadlocks to occur but provide algorithms for identifying and resolving deadlocked processes.
Os module 2 d
The document discusses deadlocks in computer systems and various approaches to handling them. It defines deadlock as when a set of processes are blocked waiting for resources held by each other in a cyclic manner. There are four conditions required for deadlock: mutual exclusion, hold and wait, no preemption, and circular wait. Methods to handle deadlocks include ignoring the problem, preventing deadlocks through design restrictions, avoiding deadlocks by dynamically checking for safety, and detecting and recovering from deadlocks after the fact. The banker's algorithm is presented as an avoidance technique using a resource allocation graph and safety checks.
Deadlock in distribute system by saeed siddik
The document discusses deadlocks in distributed systems, outlining the four conditions required for a deadlock, strategies to handle deadlocks such as ignoring, detecting, preventing, and avoiding them, and algorithms for centralized deadlock detection and distributed deadlock detection and prevention. It provides examples of resource allocation graphs to illustrate deadlock conditions and explains how distributed deadlock detection and prevention algorithms work.
Os case study word
This document discusses deadlocks in operating systems. It defines deadlock as a situation where a set of processes are blocked waiting for resources held by each other in a circular chain. The four necessary conditions for deadlock are discussed: mutual exclusion, hold and wait, no preemption, and circular wait. Methods for handling deadlocks include prevention, detection, recovery, and avoidance. Prevention removes one of the necessary conditions. Detection identifies when a deadlock occurs. Recovery breaks existing deadlocks through preemption, rollback, or killing processes. Avoidance anticipates potential deadlocks through algorithms like the Banker's algorithm.
Module3
This document discusses deadlocks in computer systems. It defines the four necessary conditions for deadlock and introduces resource allocation graphs to model deadlock states. It describes three main approaches to handling deadlocks: prevention, detection and recovery, and ignoring the problem. The rest of the document focuses on techniques for deadlock prevention, including holding and waiting, no preemption, and circular wait conditions. It also covers deadlock avoidance using safe state models, resource allocation graphs, and Banker's algorithm to determine if a resource request would result in an unsafe state.
Deadlock
A deadlock occurs when a set of processes are blocked because each process is holding a resource and waiting for another resource held by another process in the set, creating a circular wait. Four necessary conditions must be met for a deadlock to occur: mutual exclusion, hold and wait, no preemption, and circular wait. Deadlocks can be handled through deadlock avoidance, detection and recovery, or prevention. Avoidance methods like Banker's Algorithm use safe state models to prevent deadlocks, while detection algorithms use resource allocation graphs to detect deadlocks. Once detected, deadlocks are recovered through process termination or resource preemption.
Deadlock in Operating System
This PPT gives the detailed information about Deadlocks in Operating System, Cases of Deadlock, Deadlocks in File Request
Deadlocks in Database
Deadlocks in Dedicated device Allocation
Deadlocks in Multiple device allocation
Deadlocks in Spooling
Deadlocks in a Network
Deadlocks in Disk Sharing
Deadlock Prevention and Recovery
Process Synchronization And Deadlocks
The document discusses process synchronization and deadlocks. It introduces race conditions, critical sections, and solutions to synchronize processes like semaphores. Classical problems like the dining philosophers problem and bridge crossing example are presented. Deadlocks are characterized by conditions like mutual exclusion, hold and wait, no preemption and circular wait. Methods to handle deadlocks include prevention through ordering of resource requests and avoidance using resource allocation states.
Deadlocks by wani zahoor
Deadlocks occur when multiple processes are waiting for resources held by other processes in the set, creating a circular wait. The four conditions for deadlock are mutual exclusion, hold and wait, no preemption, and circular wait. Deadlocks can be addressed through prevention, avoidance, detection, or recovery. Prevention eliminates one of the four conditions. Detection identifies deadlocked processes and resources. Recovery options include terminating all or one deadlocked process at a time until the cycle is broken, or preempting resources from processes until the cycle is broken.
Unit iv: Deadlocks
The document discusses deadlocks in operating systems. It defines deadlock as when a set of processes are blocked because each is holding a resource needed by another. Four conditions must hold for deadlock: mutual exclusion, hold and wait, no preemption, and circular wait. Methods to handle deadlocks include detection, prevention, avoidance, and recovery. Prevention uses timestamping schemes like wait-die and wound-wait. Avoidance uses wait-for graphs to prevent cycles. Recovery aborts processes or preempts resources.
Chapter06
Deadlock occurs when a set of processes are permanently blocked waiting for resources held by other processes in the set. There are four necessary conditions for deadlock: mutual exclusion, hold and wait, no preemption, and circular wait. Deadlock can be prevented by ensuring that one of the conditions is not met through various techniques like requiring processes request all resources at once or defining a resource ordering. Deadlock can also be avoided by checking if a requested allocation would lead to an unsafe state through methods like the banker's algorithm. Once deadlock occurs, processes can be aborted or have resources preempted to resolve the deadlock.
Gp1242 007 oer ppt
This document discusses deadlocks in operating systems. It defines deadlock as when a set of blocked processes each hold a resource and wait for a resource held by another process. It then covers methods for handling deadlocks such as prevention, avoidance, detection, and recovery. Prevention ensures deadlock conditions cannot occur. Avoidance allows the system to deny requests that could lead to deadlock. Detection identifies when a deadlock has occurred. Recovery breaks deadlocks by terminating or preempting processes.
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This chapter discusses case studies involving users of the MS-DOS operating system and references related materials. It examines the MS-DOS system and how users interacted with it by presenting specific examples and experiences of people working with the technology. Brief citations are made to other sources for further information on the topics covered.
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The document discusses file systems and their implementation. It covers topics like files, directories, file structures, file types, file operations, memory mapping, directory structures, shared files, disk space management, file system reliability, and performance. Example file systems discussed include UNIX, MS-DOS, Windows 98, and log-structured file systems.
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Chapter 10
This document discusses various topics related to UNIX and Linux operating systems including:
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2) It describes security in UNIX and covers topics like processes, signals, system calls, shells, threads, and the ls command.
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Chapter 11
The document discusses various technical aspects of the Windows 2000 operating system, including its history, programming, system structure, processes and threads, memory management, input/output, file system, security, and caching. It provides details on topics such as the different versions of Windows 2000, the registry, hardware abstraction layer, object management, environment subsystems, scheduling, booting, virtual memory, paging, device drivers, file input/output calls, file system structure, file name lookup, file compression and encryption, access tokens, and security application programming interfaces.
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This document discusses various topics related to operating system design including the nature of the design problem, interface design, implementation, performance, project management, paradigms, implementation layers, naming, static versus dynamic structures, hiding hardware dependencies, space-time trade-offs, caching, software team structure, and the role of experience in design.
Op Sy 03 Ch 00
This study guide outlines the chapters and topics to be covered in an operating systems course to help students organize their studying and earn a passing grade. It recommends students study the relevant textbook sections, solve problems at the end of each section, and practice with past exams. The guide then lists the chapter titles and section numbers to be covered in the course.
Op Sy 03 Ch 01
This chapter introduces operating systems by discussing their importance for computer systems and historical development. It explains that an operating system manages a computer's basic functions including its hardware, software, and how programs are executed. The chapter outlines the four generations of operating systems from the first mainframe systems to today's widely used platforms. It also describes different approaches for structuring operating systems such as monolithic, layered, virtual machine, and micro-kernel models.
Op Sy 03 Ch 21
This chapter discusses processes and how they work in an operating system. It covers what a process is, how processes can execute sequentially or concurrently, how concurrency is implemented, process tables, switching between processes, shared code, process states, and the parent-child relationship between processes.
Op Sy 03 Ch 22
This document discusses process scheduling in operating systems. It covers types of scheduling like first-come, first-served (FCFS), round robin, priority scheduling, and shortest job first. It also mentions scheduling criteria like performance and describes factors like scheduling algorithms and interrupt-driven clocks that are important to scheduling.
Op Sy 03 Ch 23
This document discusses interprocess communication and solutions to common synchronization problems that can occur between processes like producer-consumer problems and race conditions. It covers topics like critical sections, mutual exclusion, starvation, deadlocks, semaphores, and message passing as techniques for processes to coordinate work and share resources without interfering with each other.
Op Sy 03 Ch 24
This document discusses deadlocks in computing systems. It defines deadlock and outlines the necessary conditions for a deadlock to occur, including mutual exclusion, hold and wait, no preemption, and circular wait. It then presents several approaches to handling deadlocks, such as prevention through resource allocation strategies, avoidance using algorithms like the Banker's Algorithm, detection of deadlocks, and recovery which may require system reboot.
Op Sy 03 Ch 25
This chapter discusses threads and how they relate to processes and data structures. It covers the characteristics of threads such as being lightweight processes that can run concurrently within the same process. The chapter also looks at how tasks can use multiple threads to improve parallelism, throughput, and responsiveness through concurrency and communication between threads.
Op Sy 03 Ch 31
This document discusses memory management techniques including storage hierarchies, important memory terms, contiguous and dynamic memory allocation, memory maps, partitions, relocation, placement algorithms, and virtual memory. It covers concepts such as buddy systems and issues with memory management like performance and problems that can arise.
Op Sy 03 Ch 32
Virtual memory addresses the problems of memory management by using secondary storage like hard disks to simulate more main memory than is physically installed. It implements an address translation system using page tables and segmentation to map virtual addresses to physical addresses, with techniques like paging, segmentation, two-level page tables, and translation lookaside buffers. This allows programs to behave as if they have vastly more memory than actually available.
Op Sy 03 Ch 33
This document discusses various policies and algorithms used by operating systems for virtual memory management, including fetch policies, page replacement policies, and algorithms like optimal page replacement, NRU, FIFO, LRU, NFU, and working set. It covers topics like placement policies, scope of replacements, hardware and software LRU implementations, and load control policies for cleaning and resident set management.
Op Sy 03 Ch 41
The document discusses file systems, including their objectives of storing and retrieving files, how they organize files in directories, and how they manage disk space using techniques like contiguous allocation, linked lists, and bitmaps. It also covers topics like ensuring file system reliability through consistency checks and improving performance through efficient file positioning and access. The file system implementation section describes common approaches used in Unix and Windows like inodes and directory structures.
Op Sy 03 Ch 51
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- 1. Deadlocks Chapter 3 3.1. Resource 3.2. Introduction to deadlocks 3.3. The ostrich algorithm 3.4. Deadlock detection and recovery 3.5. Deadlock avoidance 3.6. Deadlock prevention 3.7. Other issues