PDF-DREADLOCKS: Efficient Deadlock DetectionMaurice HerlihyJoint work with

TRANSACT 082. 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 . Detection and Avoidance. Prof. Sirer. CS 4410. Cornell University. System Model. There are non-shared computer resources. Maybe more than one instance. Printers, Semaphores, Tape drives, CPU. Processes need access to these resources. . 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.. 1. 6. Deadlocks. 6.1 Deadlocks with Reusable and Consumable. . Resources. 6.2 Approaches to the Deadlock Problem . 6.3 A System Model . Resource Graphs . State Transitions. Deadlock States and Safe States . Concurrency: Deadlock and Starvation. Operating Systems:. Internals and Design Principles. Seventh Edition. By William Stallings. Operating Systems:. Internals and Design Principles. When two trains approach each other at a crossing, both shall come to a full stop and neither shall start up again until the other has gone. Statute passed by the Kansas State Legislature, early in the 20th century.. Tore Larsen. With slides from . T. Plagemann, C. . . Griwodz. , K. Li,. A. . Tanenbaum. and M. van Steen. Resources. Resource allocation is a central OS concern. Examples . of computer resources. CPU. Chapter 6. 2. Outline. Principles of Deadlock. Introduction and conditions for deadlock. Deadlock prevention. Deadlock Avoidance. Deadlock detection. An Integrated deadlock strategy. Concurrency Mechanisms in UNIX, Linux, Solaris and Windows. Reading Assignment. T. M. Pinkston, . “. Deadlock Characterization and Resolution in Interconnection Networks,. ”. Chapter 13 in . Deadlock Resolution in Computer Integrated Systems. , CRC Press 2004. 1. 7.1 System Model. 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. 2. Examples of resource types:. 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. Ben Shelton. Motivation. Concurrent programming is . necessary. Multicore . revolution. Concurrent programming is . difficult, and . p. rogrammers need tools to help them write more reliable concurrent programs. Deadlock . detection. Resource Allocation Graphs. Resource Pool and . C. ounting Semaphores. Dining . Philosophers Problem. Condition Variables . Resource Tables. Deadlock Definition. A . deadlock.  is a situation in which two or more competing actions are each waiting for the other to finish, and thus neither ever does.