August 2000
Intermediate to advanced
800 pages
13h 15m
English
Content preview from Core PHP Programming: Using PHP to Build Dynamic Web SitesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Semaphores
PHP offers an extension for using System V semaphores. If your operating system supports this feature, you may add this extension to your installation of PHP. At the time of this writing, only the Solaris, Linux, and AIX operating systems were known to support semaphores.
Semaphores are a way to control a resource so that it is used by a single entity at once, and they were inspired by the flags used to communicate between ships. The idea to use an integer counter to ensure single control of a resource was described first by Edsger Dijkstra in the early 1960s for use in operating systems.
A complete tutorial on semaphores is beyond the scope of this text. Semaphores are a standard topic for college computer science courses, and you ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.