PPT-Lecture 13 Concurrency Bugs CV rules of thumb: Keep state in addition to CV’s

Lecture 13 Concurrency Bugs CV rules of thumb Keep state in addition to CVs Always do waitsignal with lock held Whenever you acquire a lock recheck state Implementing Join with CV void threadexit. Slide . 1. Too Much Milk. . Person A. 3:00. Arrive home: no milk. 3:05. Leave for store. 3:10. Arrive at store. 3:15. Leave store. 3:20. Arrive home, put milk away. CS 140 Lecture Notes: Concurrency. Sadhna Kumari. OUTLINE. ACID Properties. 2-Phase Commit Protocol. TPS. Serializability. Concurrency Control Protocols. Current Research. Future. References. ACID PROPERTIES. Atomicity: . A . transaction is . on Program . Analysis. Weizmann Institute . of Science. Guy Katz. and David . Harel. Overview. Program analysis: verification, repair, synthesis, . etc. Very desirable, but very difficult. State explosion. Concurrency Topics. 1. Sequential programming notation. 2. Expressing concurrency with . co. and . process. . 3. States and hardware. 4. Atomic actions. 5. Inter-leavings and histories. 6. The finite progress assumption. 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. Database Concurrency Control. 1 Purpose of Concurrency Control. To enforce Isolation (through mutual exclusion) among conflicting transactions. . To preserve database consistency through consistency preserving execution of transactions.. Baris Kasikci, . Weidong. Cui, Xinyang Ge, Ben . Niu. Why Does . In-Production Bug . Diagnosis Matter?. Potential to fix bugs that impact users. Short release cycles make in-house testing challenging. Sadhna Kumari. OUTLINE. ACID Properties. 2-Phase Commit Protocol. TPS. Serializability. Concurrency Control Protocols. Current Research. Future. References. ACID PROPERTIES. Atomicity: . A . transaction is . Understanding and Detecting Real-World Performance Bugs Guoliang Jin, Linhai Song , Xiaoming Shi, Joel Scherpelz and Shan Lu University of Wisconsin–Madison 1 Software Efficiency is Critical Software & the Concurrency Revolution by Sutter & Larus ACM Queue Magazine, Sept. 2005 For CMPS 5433 - Halverson 1 In a Nutshell “The concurrency revolution is primarily a software revolution Slide . 1. Too Much Milk. . Roomate. A. 3:00. Arrive home: no milk. 3:05. Leave for store. 3:10. Arrive at store. 3:15. Leave store. 3:20. Arrive home, put milk away. CS 140 Lecture Notes: Concurrency. -. Bhavya. . Kilari. Dr. . Yanqing. Zhang, . CSc. 8320. PREVIEW. P. ART. I. : . I. NTRODUCTION. Transaction Processing System [. R. Chow & T. Johnson, 1997. (Reduviidae) in the Order Hemiptera. Although there are many kinds of assassin bugs only a few feed on bird and mammal blood — the kissing bugs. The species most commonly encountered in California Different procedures are indicated depending on the level of duplication and the extent of deficiency. Surgery is usually performed in order to improve appearance and prehension. 5. INTRODUCTION. To use the three dimensional motions analysis (3DMA) technique to discern differences between the functional workspace of normal thumbs (n=50) and reconstructed thumbs .