PPT-CS 140 Lecture Notes: Concurrency
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Slide 1 Too Much Milk With Locks Both threads struct lock l l ockacquire ampl if milk 0 buyMilk lockrelease amp l CS 140 Lecture Notes Locks
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CS 140 Lecture Notes: Concurrency: Transcript
Slide 1 Too Much Milk With Locks Both threads struct lock l l ockacquire ampl if milk 0 buyMilk lockrelease amp l CS 140 Lecture Notes Locks. Œ Ž‘Œ Ž‘Œ’ Ž\fŒ Ž \f \f ’ ‡ “ \f” \f\b \fƒŒ Slide . 1. Too Much Milk With Locks. Both threads:. struct. lock l;. .... l. ock_acquire. (&l);. if (milk == 0) . {. . . buyMilk. ();. }. lock_release. (&. l);. CS 140 Lecture Notes: Locks. Sadhna Kumari. OUTLINE. ACID Properties. 2-Phase Commit Protocol. TPS. Serializability. Concurrency Control Protocols. Current Research. Future. References. ACID PROPERTIES. Atomicity: . A . transaction is . Seminar: Transaction Processing (Bachelor). SS 2009. Dennis . Stratmann. Outline. Goal and Overview. Examine Three Approaches to CC on RD:. 1. Predicate-Oriented Concurrency Control. 2. Relational Update Transactions. \n‹ \t\t Œ\t€Œ \r \t€ \tŽ\n\t\t Œ\t€Œ \r \t€ ‘ \t’“ Slide . 1. Technology Changes. Mid-1980’s. 2012. Change. CPU speed. 15 MHz. 2.5 GHz. 167x. Memory size. 8 MB. 4 GB. 500x. Disk capacity. 30 MB. 500 GB. 16667x. Disk transfer rate. 2 MB/s. 100 MB/s. \r ŒŽ‘’ŒŽŒ‘Œ“\t…\t† ”•’ŒŽ–\b \n„ \n Slide . 1. Access Matrix. File A. File B. File C. Printer 1. Alice. RW. RW. RW. OK. Bob. R. R. RW. OK. Carol. RW. David. RW. OK. Faculty. RW. RW. OK. CS 140 Lecture Notes: Protection. Slide . 2. Access Matrix. Slide . 1. Memory Layout for Process. Code. 0. ∞. Data. Stack. CS 140 Lecture Notes: Linkers. Slide . 2. Creating a Process. Code. 0. ∞. Data. Stack. 101010101010101010101010101010101010101010101010. Œ’ˆŒŒ“”\fŒ•‹‹‰‹––•–‰– “ 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.. Sadhna Kumari. OUTLINE. ACID Properties. 2-Phase Commit Protocol. TPS. Serializability. Concurrency Control Protocols. Current Research. Future. References. ACID PROPERTIES. Atomicity: . A . transaction is . 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 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. 3:25. 3:30. CS 140 Lecture Notes: Concurrency. Slide . 1. Too Much Milk.
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