Week 12 - July 29-August 2

Introduction

This week we study semaphores. Semaphores provide us with a synchronization mechanism to protect shared resources used by multiple processes.

Videos

Quiz

• Quiz 10 will be on semaphores. Study chapter 53 of The Linux Programming Interface

Lecture Material

• Semaphores - Chapter 53 of The Linux Programming Interface.

Lab

• Lab 9 - Server with Multiple Clients and a Receive Thread with Mutexing.

Assignment(s)

Introduction to Assignment 2.

Sample Code

Semaphores

• Code that demonstrates non-named semaphores can be found in client1.cpp and client2.cpp with their Makefile.
• Code that demonstrates named semaphores that can be used across two processes can be found in client.h, client1.cpp and client2.cpp with its Makefile.
• Code that restricts access to a data base using named semaphores between three processes can be found in client.h, dataBase.cpp, client1.cpp, client2.cpp and client3.cpp with its Makefile.