Solaris’ turnstiles

Although Solaris is now mostly defunct, its influence remains substantial; technologies pioneered by Solaris can still be found across a wide range of software

A lot of Solaris' inventions have been described and talked about ad nauseam (such as the Slab Allocator), but one I rarely see discussed is its use of turnstiles.

Despite being relatively obscure, the idea has quietly spread far beyond Solaris. Variations of it can now be found in major operating systems, web browsers, and language runtimes. In fact, you're probably using several implementations of the same basic concept right now!

Loic Gregoire

I'm not going to pretend to understand all of this, but I know you people do, and many of you will definitely find this interesting to read. Also note that Gregoire develops their own operating system kernel called zag.