Little Book of Semaphores https://greenteapress.com/wp/semaphores/ https://greenteapress.com/wp/semaphores/ while not on the front page is a really good book

Little Book of Semaphores https://greenteapress.com/wp/semaphores/ https://greenteapress.com/wp/semaphores/ while not on the front page is a really good book that you should read if you are interested in multithreaded programming. It has a bunch of interesting puzzles and solutions. Even if you don't use semaphores, these exercises will be useful in increasing your understanding.