RTEMS ITRON 3.0 API User's Guide
In general, an attribute set is built by a bitwise OR of the desired attribute components. The following table lists the set of valid semaphore attributes:
TA_TFIFO - tasks wait by FIFO
TA_TPRI - tasks wait by priority
Attribute values are specifically designed to be mutually exclusive, therefore bitwise OR and addition operations are equivalent as long as each attribute appears exactly once in the component list.
RTEMS ITRON 3.0 API User's Guide
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