Operating System Deadlock Galvin

Critical Section Problem, Synchronization Hardware, Mutex, Semaphore, Monitor, Classic problems in Synchronization

Deadlocks-An Unconditional Waiting Situation in Operating System. We must make sure of This concept well before understanding deep in to Operating System. This PPT will understands you to get how the deadlocks Occur and how can we Detect, avoid and Prevent the deadlocks in Operating Systems.

this ppt is about deadlock - system model , methods of handling deadlock, deadlock avoidance, recovery from deadlock, deadlock detection

This document discusses deadlock detection in distributed systems. It defines deadlock as when a set of processes are permanently blocked waiting for resources held by each other. There are four conditions for deadlock: mutual exclusion, hold and wait, no preemption, and circular wait. Deadlock can be detected using centralized, hierarchical, or distributed approaches. Goldman's distributed algorithm avoids maintaining a continuous wait-for graph by exchanging blocked process lists to detect cycles that indicate deadlocks.

This document discusses deadlocks in operating systems. It defines deadlock as when multiple processes are waiting for resources held by each other in a cyclic manner, resulting in none of the processes making progress. It provides examples and describes the four necessary conditions for deadlock to occur: mutual exclusion, hold and wait, no preemption, and circular wait. It also discusses methods for handling deadlocks, including prevention, avoidance, and recovery techniques like terminating processes or preempting resources.

The document discusses deadlocks in computing systems. It defines deadlocks and related concepts like livelock and starvation. It presents various approaches to deal with deadlocks including detection and recovery, avoidance through runtime checks, and prevention by restricting resource requests. Graph-based algorithms are described for detecting and preventing deadlocks by analyzing resource allocation graphs. The Banker's algorithm is introduced as a static prevention method. Finally, it discusses ways to eliminate the conditions required for deadlocks, like mutual exclusion, hold-and-wait, and circular wait.

In these slides I discussed about deadlock,causes of deadlock,effects of deadlock,conditions of deadlock,resource allocation graph,deadlock handling strategies,deadlock prevention,deadlock avoidance,deadlock avoidance and resolution....I haven't touch algorithms section in these slides.....and last thing I want to say that don't forget to follow me...

There are three main methods for dealing with deadlocks in an operating system: prevention, avoidance, and detection with recovery. Prevention ensures that the necessary conditions for deadlock cannot occur through restrictions on resource allocation. Avoidance uses additional information about future resource needs and requests to determine if allocating resources will lead to an unsafe state. Detection identifies when a deadlock has occurred, then recovery techniques like process termination or resource preemption are used to resolve it. No single approach is suitable for all resource types, so systems often combine methods by applying the optimal one to each resource class.

CPU scheduling allows processes to share the CPU by pausing execution of some processes to allow others to run. The scheduler selects which process in memory runs on the CPU. There are four types of scheduling decisions: when a process pauses for I/O, switches from running to ready, finishes I/O, or terminates. Scheduling can be preemptive, where a higher priority process interrupts a running one, or non-preemptive. Common algorithms are first come first serve, shortest job first, priority, and round robin. Real-time scheduling aims to process data without delays and ensures the highest priority tasks run first.

This chapter discusses process synchronization and solving the critical section problem. It introduces Peterson's solution to the critical section problem and other synchronization methods like mutex locks, semaphores, and monitors. Classical synchronization problems covered include the bounded buffer problem, dining philosophers problem, and readers-writers problem. The chapter aims to present concepts of process synchronization and tools to solve synchronization issues.

Deadlock occurs when two or more competing processes are each waiting for resources held by the other, resulting in all processes waiting indefinitely. There are four conditions required for deadlock: mutual exclusion, hold and wait, no preemption, and circular wait. Techniques to prevent deadlock include attacking each condition: allowing some resources to be shared, requiring processes request all resources at start, allowing preemption of resources, and imposing a global numbering on resource requests.

The document discusses deadlocks in database systems. It defines deadlock as a waiting state where transactions are unable to progress because each is holding a resource needed by another, forming a cyclic dependency. It outlines the four conditions for deadlock - mutual exclusion, hold and wait, no preemption, and circular wait. Methods for handling deadlocks include avoidance, prevention, detection and recovery. Prevention techniques involve locking protocols or transaction rollback with timestamps. Detection uses a wait-for graph to identify cycles indicating deadlocks, and recovery requires selecting victims to rollback to break cycles.

This document summarizes key concepts from Chapter 7 of the textbook Operating System Concepts by Silberschatz, Galvin and Gagne. It discusses deadlocks in computer systems, including their characterization and conditions for their occurrence. It also describes several approaches for handling deadlocks, such as prevention, avoidance, detection and recovery methods. The resource allocation graph and banker's algorithm are presented as techniques for deadlock avoidance when multiple instances of resources are present.

Deadlocks occur when a set of blocked processes each hold resources and wait for resources held by other processes in the set, resulting in a circular wait. The four necessary conditions for deadlock are: mutual exclusion, hold and wait, no preemption, and circular wait. The banker's algorithm is a deadlock avoidance technique that requires processes to declare maximum resource needs upfront. It ensures the system is always in a safe state by delaying resource requests that could lead to an unsafe state where deadlock is possible.

Salman Ahmed presents on deadlocks in computer systems. A deadlock occurs when two programs are preventing each other from accessing shared resources, causing both programs to cease functioning. Deadlocks happen when processes are holding resources and waiting to acquire more resources, but cannot release the initial resources. There are four main approaches to handling deadlocks: prevention, avoidance, detection, and recovery. Prevention eliminates one of the conditions required for a deadlock, while avoidance allows the system to refuse resource requests to avoid entering a deadlocked state.

The document discusses deadlocks in operating systems. It defines deadlock as a situation where a set of processes are blocked waiting for resources held by other processes in the set, resulting in none of the processes making any progress. Four conditions must be met for deadlock to occur: mutual exclusion, hold and wait, no preemption, and circular wait. The document presents examples to illustrate deadlock and discusses different strategies for dealing with it, including deadlock prevention, avoidance, and detection and recovery. It specifically describes the Banker's Algorithm for deadlock avoidance.

Deadlock is a very important topic in operating system. In this presentation slide, try to relate deadlock with real life scenario and find out some solution with two main algorithm- Safety and Banker's Algorithm.

This document discusses deadlocks in operating systems. A deadlock occurs when a set of processes are blocked waiting for resources held by each other in a cyclic manner. Four conditions must be met for a deadlock to occur: mutual exclusion, hold and wait, no preemption, and circular wait. The document outlines strategies for detecting and avoiding deadlocks such as deadlock detection algorithms, safe state models like the Banker's Algorithm, and techniques for preventing the four deadlock conditions.

This document discusses deadlocks in database systems. It explains that deadlocks occur when two or more competing actions get stuck waiting on each other to finish. It then provides an example of a deadlock between two dogs, Tony and Jake, fighting over bones. It demonstrates how to detect and debug deadlocks using MySQL status commands and log files. Finally, it offers best practices like defining proper indexes to avoid deadlocks and handling them through retry logic or manual locking.

Shivangi submitted a document on deadlocks to Tapas Sangiri. The 3-sentence summary is: The document discusses different aspects of deadlocks including definitions, characteristics, methods for handling them such as prevention, avoidance and recovery. Prevention methods aim to ensure a deadlock never occurs by restricting resource allocation in different ways. Avoidance algorithms analyze the resource allocation graph to determine if a system is in a safe state to avoid deadlocks.

This document discusses deadlocks, including the four conditions required for a deadlock, methods to avoid deadlocks like using safe states and Banker's Algorithm, ways to detect deadlocks using wait-for graphs and detection algorithms, and approaches to recover from deadlocks such as terminating processes or preempting resources.

This presentation about Gary L. Peterson's critical section problem solution. this file also provide Java source code to solve.

The document discusses deadlock in computer systems. It defines deadlock and lists necessary conditions for deadlock including mutual exclusion, hold and wait, no preemption, and circular wait. It also discusses strategies for dealing with deadlock such as detection, recovery, and prevention/avoidance. The resource allocation graph (RAG) model is introduced as a way to represent system states and detect deadlock. Algorithms like Banker's algorithm aim to avoid deadlock by ensuring safe allocation of resources.

The document discusses solutions to the critical section problem where multiple processes need exclusive access to shared resources. It defines the critical section problem and requirements for a solution. It then presents three algorithms using shared variables to coordinate access between two processes in a way that satisfies mutual exclusion, progress, and bounded waiting.

This document outlines the key aspects of deadlocks in operating systems. It defines the necessary conditions for a deadlock to occur as mutual exclusion, hold and wait, no preemption, and circular wait. A resource-allocation graph is used to model resource usage, where a cycle indicates a potential deadlock. Deadlocks can be prevented by avoiding one of the necessary conditions, or can be detected using the graph model to identify cycles. Upon detection, processes may need to be terminated or have resources preempted to recover from the deadlock.

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.

This document discusses different approaches to handling deadlocks in operating systems, including prevention, avoidance, detection, and recovery. Deadlock prevention methods restrain how processes request resources to ensure deadlocks cannot occur. Deadlock avoidance uses information about maximum resource needs to dynamically monitor the system's allocation state and ensure it never enters an unsafe state where deadlock is possible. The Banker's Algorithm is presented as a deadlock avoidance technique that models the system and checks if allocating resources leaves the system in a safe state.

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.

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.

The document summarizes key topics about deadlocks in operating systems including deadlock characterization, prevention, and avoidance. It defines deadlock as a set of blocked processes where each process is waiting for a resource held by another in the set. Four conditions must be met for deadlock to occur: mutual exclusion, hold and wait, no preemption, and circular wait. Deadlock prevention methods ensure systems never enter a deadlock state while avoidance uses a safe state algorithm and resource ordering to dynamically prevent unsafe states.

Senthilkanth,MCA.. The following ppt's full topic covers Operating System for BSc CS, BCA, MSc CS, MCA students.. 1.Introduction 2.OS Structures 3.Process 4.Threads 5.CPU Scheduling 6.Process Synchronization 7.Dead Locks 8.Memory Management 9.Virtual Memory 10.File system Interface 11.File system implementation 12.Mass Storage System 13.IO Systems 14.Protection 15.Security 16.Distributed System Structure 17.Distributed File System 18.Distributed Co Ordination 19.Real Time System 20.Multimedia Systems 21.Linux 22.Windows

This chapter discusses deadlocks in computer systems. It defines deadlock as a situation where a set of blocked processes are each holding resources and waiting for additional resources held by other processes in the set, resulting in a circular wait. The chapter presents methods for handling deadlocks including deadlock prevention, avoidance, detection, and recovery. It describes the basic conditions for deadlock and models like the resource allocation graph used to analyze deadlock states. Banker's algorithm is provided as an example of a deadlock avoidance strategy.

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.

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 occurs when multiple processes are blocked waiting for resources held by other processes in the set, resulting in no forward progress. There are four conditions required for deadlock: mutual exclusion, hold and wait, no preemption, and circular wait. Deadlock can be handled through prevention, avoidance, detection, and recovery. Prevention ensures one of the four conditions is never satisfied. Avoidance allows resource allocation if it does not lead to an unsafe state. Detection identifies when deadlock occurs. Recovery regains resources by terminating processes or preempting resources.

Deadlocks occur in operating systems when processes are blocked waiting for resources held by other blocked processes, forming a circular wait. There are four conditions for deadlock: mutual exclusion, hold and wait, no preemption, and circular wait. Deadlocks can be modeled using a resource allocation graph (RAG) with processes and resources as nodes and request/assignment edges. A cycle in the RAG indicates a deadlock. Detection algorithms work by maintaining a wait-for graph (WFG) and periodically searching for cycles, while avoidance methods analyze resource requests to allow only safe sequences.