### C Library Functions: Fast RAM Semaphores

Function | Header File | Description
__cxchg | builtin.h | Exchanges a character value with a previously stored value.
__lxchg | builtin.h | Exchanges a long integer value with a previously stored value.
__sxchg | builtin.h | Exchanges a short integer value with a previously stored value.

Alphabetical Listing of IBM C and C++ Compilers Functions and Macros