PPT-Deadlocks What is a Deadlock

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 Detection Is this system deadlocked and if so which processes are involved. Chapter 7: Deadlocks. The Deadlock Problem. System Model. Deadlock Characterization. Methods for Handling Deadlocks. Deadlock Prevention. Deadlock Avoidance. Deadlock Detection . Recovery from Deadlock . Mark Stanovich. Operating Systems. COP 4610. Deadlocks. Resource:. Something a thread waits for. Deadlocks. : Occur when threads are waiting for resources with circular dependencies. Often involve . . Network Architecture. Shubhendu. S. . Mukherjee. , Peter . Bannon. , Steven Lang, Aaron Spink, and David Webb. Alpha Development Group, Compaq. HOT Interconnects 9 (2001). Presented by John Ingalls. What is it?. What is concurrency?. Concurrency is not a new idea…. Concurrency was first developed by the ancient Babylonians.. They thought about stuff, walked, and chewed gum … all at the same time.. DEADLOCKS. Manju Muralidharan . Priya. Objective. At the end of this presentation, you will know:. What is a Deadlock?. Preventing and Avoiding Deadlocks. Detecting Deadlocks. Recovery Schemes. 2. CS 561 Deadlocks. DEADLOCKS. To be discussed…. Definition of deadlock. Example of deadlock. Resource allocation graph. Strategies to handle deadlock. - . Deadlock Prevention. - . Deadlock Avoidance. - . Reading Assignment. T. M. Pinkston, . “. Deadlock Characterization and Resolution in Interconnection Networks,. ”. Chapter 13 in . Deadlock Resolution in Computer Integrated Systems. , CRC Press 2004. Scheduling. Damian Gordon. Process Scheduling Policies. What are good policies to schedule processes?. Process Scheduling Policies. What are good policies to schedule processes?. Maximum Throughput. Minimize Response Time. Reading Assignment. T. M. Pinkston, . “. Deadlock Characterization and Resolution in Interconnection Networks,. ”. Chapter 13 in . Deadlock Resolution in Computer Integrated Systems. , CRC Press 2004. In order to talk about deadlocks in a system, it’s helpful to have a model of the system. A . system consists of a set of resources. The resources can be grouped into types. Processes compete to have (unique) access to instances of the types. IEEE TC. , May 1987. F. . Silla. , and J. . Duato. , “Improving the Efficiency of Adaptive Routing in Networks with Irregular Topology,” . HIPC. 1997. J. . Duato. “A New Theory of Deadlock-Free Adaptive Routing in Wormhole Networks,” . BYU CS 345. Concurrency. 2. CS 345. Stalling’s Chapter. #. Project. 1: Computer System Overview. 2: Operating System Overview. 4. P1:. Shell. 3: Process Description and Control. 4: Threads. 4. P2: Tasking. Spring 2013. Deadlocks. Dan Tsafrir (13/5/2013). Partially based on slides by Hagit Attiya. OS (234123) - spring 2013 - deadlocks. 1. Text @ OS notes book. Much of the material appears in Section 3.2 in Feitelson’s OS notes book. OPERATING SYSTEMS . DEADLOCKS. 7: Deadlocks. 2. What Is In This Chapter?. What is a deadlock?. Staying Safe: Preventing and Avoiding Deadlocks. Living Dangerously: Let the deadlock happen, then detect it and recover from it..