TAILIEUCHUNG - Lecture Operating system concepts (Fifth edition): Module 6 - Avi Silberschatz, Peter Galvin

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. | Module 6: Process Synchronization Background The Critical-Section Problem Synchronization Hardware Semaphores Classical Problems of Synchronization Critical Regions Monitors Synchronization in Solaris 2 Atomic Transactions Operating System Concepts Background Concurrent access to shared data may result in data inconsistency. Maintaining data consistency requires mechanisms to ensure the orderly execution of cooperating processes. Shared-memory solution to bounded-butter problem (Chapter 4) allows at most n – 1 items in buffer at the same time. A solution, where all N buffers are used is not simple. Suppose that we modify the producer-consumer code by adding a variable counter, initialized to 0 and incremented each time a new item is added to the buffer Operating System Concepts Bounded-Buffer Shared data type item = ; var buffer array [0n-1] of item; in, out: 0n-1; counter: 0n; in, out, counter := 0; Producer process repeat produce an item in nextp while counter = n do .

• Hệ điều hành
• Operating system concepts
• Lecture Operating system concepts
• Operating system
• Hệ điều hành
• Computer system organization
• Process synchronization
• Operating system services
• Operating system structures
• Operating system design
• Operating system structure
• Operating System Debugging
• Operating System Generation
• Types of System Calls
• Computer system structures
• File system interface
• File system implementation
• Computer system architecture
• The Linux system