'Semaphore mutex 1' diaporamas de présentation

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Basic Synchronization Principles

8. Basic Synchronization Principles. Background. In a multi-programmed OS, processes/threads often need to share resources: printers, files, data in memory, etc. Concurrent access to shared resources may result in inconsistent/improper operation.

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Outline for Today

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Semaphores

Semaphores. The producer-consumer problem using semaphores. Producer/Consumer. Producer down(&empty); down(&mutex); insert_item(item); up(&mutex); up(&full);. N = 6 Semaphore mutex = 1 Semaphore full = 0 Semaphore empty = N. producer1. consumer1. producer2. consumer2. Run queue.

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Processes and Threads Part II

Processes and Threads Part II. 2.1 Processes 2.2 Threads 2.3 Interprocess communication 2.4 Classical IPC problems 2.5 Scheduling. Chapter 2. 2.3 Interprocess Communication 2.3.1 Race Conditions.

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Mutual Exclusion

Mutual Exclusion. Mutual exclusion Critical sections Primitives Implementing it Dekker's alg Peterson's alg Lamport's alg H/W solutions Intro to semaphores. Dijkstra Semaphore. Invented in the 1960s

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CSE 153 Design of Operating Systems Winter 2019

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