Classical synchronization problems

Lecture Operating systems: Lesson 24 - Dr. Syed Mansoor Sarwar. The main topics covered in this lesson include: types of semaphores, counting semaphores, classical synchronization problems, bounded buffer problem, readers and writers problem, dining philosophers problem,...

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Module 6 - Process synchronization. Chapter 6 is concerned with the topic of process synchronization among concurrently executing processes. Concurrency is generally very hard for students to deal with correctly, and so we have tried to introduce it and its problems with the classic process coordination problems: mutual exclusion, bounded-buffer, readers/writers, and so on. An understanding of these problems and their solutions is part of current operating system theory and development.

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Chapter 9 - Process synchronization. This chapter discusses the synchronization requirements of some classic problems in process synchronization and discusses how they can be met by using synchronization features such as semaphores and monitors provided in programming languages and operating systems.

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In this chapter, the following content will be discussed: Background, the critical-section problem, peterson’s solution, synchronization hardware, mutex locks, semaphores, classic problems of synchronization, monitors, synchronization examples, alternative approaches.

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Process Synchronization Background The Critical-Section Problem Peterson’s Solution Synchronization Hardware Semaphores Classic Problems of Synchronization Monitors Synchronization Examples Atomic Transactions Silberschatz, Galvin and Gagne ©2005 .Background Concurrent access to shared data may result in data inconsistency Maintaining data consistency requires mechanisms to ensure the orderly execution of cooperating processes Suppose that we wanted to provide a solution to the consumer-producer problem that fills all the buffers.

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synchronously and BeginInvoke executes the delegate asynchronously. To complete an asynchronous operation initiated using BeginInvoke, you call the Control.EndInvoke method. The BeginInvoke and EndInvoke methods make up a common asynchronous execution pattern known as the Classic Async pattern. The details of this pattern and the options you have available for handling method completion are discussed in recipe 4-2. The Code The following example shows how to update a Windows Forms control from multiple threads.

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