'Deadlock prevention' diaporamas de présentation

Deadlocks

Deadlocks. CS 3060. Imagine a narrow set of stairs, only wide enough for one person to pass. However, the landings are big enough for several people to stand. Wait. Deadlock. Preemptable and Non-preemptable Resources.

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Concurrency: Deadlock and Starvation

Concurrency: Deadlock and Starvation. Chapter 5. Deadlock. Permanent blocking of a set of processes that either compete for system resources or communicate with each other No efficient solution Involve conflicting needs for resources by two or more processes. Bridge Crossing Example.

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Deadlock

Deadlock. Deadlock is a situation where a process or a set of processes is blocked on an event that never occurs Processes while holding some resources may request for additional allocation of resources which are held by other processes Processes are in circular wait for the resources.

1.01k views • 50 slides

Chapter 8 Deadlocks

Chapter 8 Deadlocks. Outline. System Model Deadlock Characterization Methods for Handling Deadlocks Deadlock Prevention Deadlock Avoidance Deadlock Detection Recovery from Deadlock Combined Approach to Deadlock Handling. The Deadlock Problem.

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CSC 322 Operating Systems Concepts Lecture - 29: b y Ahmed Mumtaz Mustehsan

CSC 322 Operating Systems Concepts Lecture - 29: b y Ahmed Mumtaz Mustehsan. Special Thanks To: Tanenbaum , Modern Operating Systems 3 e, (c) 2008 Prentice-Hall, Inc . (Chapter-6) Silberschatz , Galvin and Gagne 2002, Operating System Concepts,

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Operating Systems, 122

Operating Systems, 122. Practical Session 8 Deadlocks. Deadlocks. The ultimate form of starvation. A set of processes is deadlocked if each process in the set is waiting for an event that only another process in the set can cause. Conditions for Deadlock.

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Concurrency: Deadlock and Starvation

Concurrency: Deadlock and Starvation. Chapter 6. Deadlock. Permanent blocking of a set of processes that either compete for system resources or communicate with each other Involves conflicting needs for resources by two or more processes There is no satisfactory solution in the general case

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Deadlock Solutions

Deadlock Solutions. CS 241 March 28 , 2012 University of Illinois. Announcements. Office hours today: 3-4 and 5-6 In between: Talk by Tom Wenisch Energy efficiency in warehouse-scale computers 4pm, in 3405 SC Midterm exams: you may look at them through the end of this week

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CH 3 Deadlock

CH 3 Deadlock. When 2 (or more) processes remain blocked forever !. Process a Down x Gets x Down y Blocks. Process b Down y Gets y Down x Blocks. How can this happen?. Both are blocked forever !. Resources. Things for which we request exclusive access.

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Chapter 16: Concurrency Control

Lock-Based Protocols Timestamp-Based Protocols Validation-Based Protocols (Optimistic Conc. Control) Multiple Granularity Multiversion Schemes Deadlock Handling Insert and Delete Operations. Chapter 16: Concurrency Control. A lock is a mechanism to control concurrent access to a data item

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Deadlocks

Deadlocks. * Deadlock: definitions * Deadlock detection and recovery * Deadlock avoidance * Deadlock prevention. The Deadlock Problem.

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Computer Systems Principles Deadlock

Computer Systems Principles Deadlock. Emery Berger and Mark Corner University of Massachusetts Amherst. Deadlocks. Deadlock = condition where two threads/processes wait on each other. thread A printer->wait(); disk->wait();. thread B disk->wait(); printer->wait();. 2.

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Deadlock

Deadlock. Permanent blocking of a set of process that compete for system resources or communicate with each other. Conditions that characterizes deadlock Mutual exclusion Hold and wait No pre-emption Circular wait. P 5. R 1. R 3. R 4. P 1. P 2. P 3. P 4. R 2. R 5.

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Chapter 7: Deadlocks

Chapter 7: Deadlocks. Chapter 7: Deadlocks. The Deadlock Problem System Model Deadlock Characterization Methods for Handling Deadlocks Deadlock Prevention Deadlock Avoidance Deadlock Detection Recovery from Deadlock. What is a Deadlock?.

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Chapter 16 : Concurrency Control

Chapter 16 : Concurrency Control. A lock is a mechanism to control concurrent access to a data item Data items can be locked in two modes : 1 . exclusive (X) mode . Data item can be both read as well as written. X-lock is requested using lock-X instruction.

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CSE451 NT Deadlocks Autumn 2002

CSE451 NT Deadlocks Autumn 2002. Gary Kimura Lecture #10 October 21, 2002. Your job week #4. Readings in Silberschatz Chapter 8 No homework this week instead there is a midterm exam on Friday. Today.

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Deadlocks

Deadlocks. pp. 309. System Model. A process may utilize a resource in only the following sequence:. Request Use Release. Necessary Conditions. ???????????????? ????? necessary condition ??? ???????? ?????????? ????????. Mutual exclusion (non-sharable)

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Deadlock and Starvation

Deadlock : A set of Processes holding resources and blocked waiting for others held by a processes in the same wait set. Starvation : Resource is always granted to other waiting processes Example : 2 tape drives, P 1 and P 2 each hold one and need both

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Lecture 7: Deadlock

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Review Question

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