Inside Macintosh: Networking With Open Transport / Part 2 - Open Transport Reference

Chapter 27 - Utilities Reference / Functions

Locking Functions

Open Transport provides the following locking functions so that you can protect "critical sections" of your code. Protecting a critical section ensures that this section is accessed by at most one caller. You might want to create such a section if it can be accessed by more than one caller and you want to guarantee each caller exclusive access to that section.