'Turn 1' diaporamas de présentation

Softrare Reliability Methods

Softrare Reliability Methods. Prof. Doron A. Peled Bar Ilan University, Israel And Univeristy of warwick, UK. Version 2008. Some related books:. Mainly:. Also:. Use software engineering methodologies to develop the code. Use formal methods during code development.

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Chapter 6: Process Synchronization

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Solution to Race Condition: Mutual Exclusion and Synchronization

Solution to Race Condition: Mutual Exclusion and Synchronization. Problems with concurrent execution. Concurrent processes (or threads) often need to share data (maintained either in shared memory or files) and resources

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Background

Background. Concurrent access to shared data may result in data inconsistency Maintaining data consistency requires mechanisms to ensure the orderly execution of cooperating processes (i.e., processes share memory or use message passing to cooperate). Example:

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Enforcing Concurrent Temporal Behaviors

Enforcing Concurrent Temporal Behaviors. Doron Peled, Dept. of CS University of Warwick. Verification of systems. Modeling (translating). Code, Design. Some representation. Verifying. Counterexample. Checking against original code. Failed. Some feedback information.

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Synchronization II

Synchronization II. We will be looking at synchronization in two kinds of systems: Shared memory systems Mutual exclusion Semaphores Message passing systems Time in distributed systems Mutual exclusion Election in distributed systems. Shared Memory Coordination.

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Background

Background. Concurrent access to shared data may result in data inconsistency Maintaining data consistency requires mechanisms to ensure the orderly execution of cooperating processes Recall Producer/Consumer problem in Chapter 4.

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Operating Systems, 122

Operating Systems, 122. Practical Session 5, Synchronization. 1. Motivation. Multiprocessing needs some tools for managing shared resources Printers Files Data Bases. 2. Conditions for a good Solution.

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Unrealistic dialogue: speech in drama versus speech in real life Dan McIntyre

Unrealistic dialogue: speech in drama versus speech in real life Dan McIntyre. How like naturally-occurring speech is dramatic dialogue?.

501 views • 36 slides

Operating Systems

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Specification Formalisms

Specification Formalisms. Book: Chapter 5. Properties of formalisms. Formal. Unique interpretation. Intuitive. Simple to understand (visual). Succinct. Spec. of reasonable size. Effective. Check that there are no contradictions. Check that the spec. is implementable.

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A Critical Section

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A Refinement Calculus for Promela

A Refinement Calculus for Promela. Asankhaya Sharma Department of Computer Science National University of Singapore ICECCS 2013. Formal Development. Model Checking. Informal. Informal. Generate Executable Code from Formal Model of System. Code Synthesis. The SPIN Model Checker.

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Concurrency Intro

Concurrency Intro. Interleaving (multiprogramming) produces many problems Relative speed of two processes is not generally predictable Must be careful when sharing global resources O.S. Data Structures, Files, etc. Protecting system from bad processes

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1. What are the various real-time CPU scheduling algorithms. Explain each one in brief.

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Retaking Vierville

Retaking Vierville. ASL Scenario S1. Allies: Major E Germans: Ireland94 5-20 Feb 2010. AAR.

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The Dining Philosophers Problem

The Dining Philosophers Problem. The Dining Philosophers. Philosopher (int i) { while (TRUE) {// Think (wait for forks) then Eat P (fork[i]); // test left fork P (fork[(i+1) mod 5]); // test right fork eat(); V (fork[(i+1) mod 5]); V (fork[i]); } }

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Guaranteed Wealth

Imagine Guaranteed Wealth app sitting on your computer that turns $250 into $425 all day long. Visit site - http://themes.sarkis-design.com/guaranteed-wealth/

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Guardians

Deployment. Assault. Kommandos. Tact. Tact. Warp. Scorp. Tact. P. O. Tact. O. A. HT. Guardians. Reap. K. D. O. WT. D. GENE. Scout. GAUNT. C. TERM. WAR. BOYZ. G. NOBZ. K. Reserves:. O. Objective (there were more of these) Ork: G=Ghazakull, K=Killa Kan, D=Deffkopta

321 views • 8 slides