Session 14 Synchronization with Semaphores | Linux Programming | Linux Application Programming
Introduction to GNU/Linux Semaphores
Discussion of Binary and Counting Semaphores
Creating and Configuring Semaphores
Acquiring and Releasing Semaphores
Single Semaphores or Semaphore Arrays
The ipcs and ipcrm Utilities for Semaphores
In this session, we’ll explore the topic of semaphores. GNU/Linux provides both binary and counting semaphores using the same POSIX compliant API function set. We’ll also investigate semaphores in GNU/Linux and their similarities with some of the other IPC mechanisms.
A semaphore is nothing more than a variable that is protected. It provides a means to restrict access to a resource that is shared amongst two or more processes. Two operations are permitted, commonly called acquire and release. The acquire operation allows a process to take the semaphore, and if it has already been acquired, then the process blocks until it’s available. If a process has the semaphore, it can release it, which allows other processes to acquire it. The process of releasing a semaphore automatically wakes up the next process awaiting it on the acquire operation.
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