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

Chapter 27 - Utilities Reference / Constants and Data Types

The Lock Data Type

The lock data type defines a value that is used by the functionOTClearLock and the OTAcquireLock function to ensure that Open Transport does not recursively reenter locked areas of code. The lock data type is defined by the OTLock data type.

typedef UInt8 OTLock;