RTEMS C User's Guide
Each API consists of a collection of managers. Each manager is responsible for instances of a particular object class. Classic API Tasks and POSIX Mutexes example classes.
The object Id contains a field indicating the class that an object instance is associated with. This field holds a numerically small non-zero integer. In all APIs, a class value of one is reserved for tasks or threads.
RTEMS C User's Guide
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