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1sharedvariable2lock1bitbooleaninitiallyFALSE34lock5whileTRUE6whilelockTRUE7busywait89retXACQUIREtestsetlock10ifretFALSE11return121314unlock15XRELEASElockFALSE16 Figu. NASA facts National Aeronautics and Space Administration brPage 2br lanning for each space shuttle mission includes provisions for an unscheduled landing at contingency landing sites in the United States and overseas Several unscheduled landing scen As long as the abort push button is held in the fire suppression system will not release Note When the control unit is programmed for IRI compliance the abort will not be effective after pre discharge When the push button is released the release ci Concurrency Control --- 3. Steve Ko. Computer Sciences and Engineering. University at Buffalo. Recap. Strict execution of transactions?. Delay . both their read and write operations . on an . object until . Events. Option #1. Using Events Table. Choose Date Ranges you wish to analyze. Use Command: EVENTS\ISB FOR LACT>0. Choose Event Option: Table by Month. Check box for ABORT Event and then click OK. Part 2: Software-Based Approaches. Dennis Kafura – CS5204 – Operating Systems. 1. Dennis Kafura – CS5204 – Operating Systems. Word-based STM (Shavit&Touitou). Guarantees lock-freedom. Uses a non-recursive “helping” strategy. Patrick Santos (4465359). 1. Agenda. What is transactional memory (TM)?. Example transactions. Deadlocks and Cache Coherence. Types of TM. Implementations . & proposals . in industry. Sun / Oracle. TRANSACTION. . COMMUNICATION. OUTLINE. P. ART. I. : . I. NTRODUCTION. P. ART. II. : . C. URRENT . R. ESEARCH. P. ART. III. : . F. UTURE . P. OTENTIAL. R. EFERENCES. What is transaction?. Fundamental unit of interconnection b/w client and server processes in database system.. Eventual Consistency. No class next Wednesday. Oscar Office Hours Today 4PM G9 Lounge. Two-phase commit. Coordinator. Suboordinate. PREPARE(T). FW(PREPARE, . T,locks. ,. …). VOTE(T,YES/NO). If all yes. Eventual Consistency. No class next Wednesday. Oscar Office Hours Today 4PM G9 Lounge. Two-phase commit. Coordinator. Suboordinate. PREPARE(T). FW(PREPARE, . T,locks. ,. …). VOTE(T,YES/NO). If all yes. Prof. Smruti R. Sarangi. IIT Delhi. Outline. Multicore Processors. Parallel Programming Pardigms. Transactional Memory: Basics. Software Transactional Memory(STM). Hardware Transactional Memory. Multicores in the last Five Years. EE324. Concurrency Control. General organization of managers for handling transactions.. 2. Two-phase locking is “pessimistic”. Acts to prevent non-serializable schedules from arising: pessimistically assumes conflicts are fairly likely. Aritra Sengupta. Man Cao. Michael D. Bond. and. Milind Kulkarni. 1. Programming Language Semantics? . Data Races. C++ no guarantee of semantics – “catch-fire” semantics . Java provides weak semantics. Eventual Consistency & Dynamo. Two-phase commit. Coordinator. Suboordinate. PREPARE(T). FW(PREPARE, . T,locks. ,. …). VOTE(T,YES/NO). If all yes. . FW(COMMIT). Else. . FW(ABORT). COMMIT/ABORT(T). Kyle J. Hazelwood. Main Injector Department Meeting. May 30, 2018. Last shutdown MI/RR abort BLMs were moved to MBLM40 node.. We now have LQ, LI, LS… devices like the ring. LM devices are soon to be obsoleted.