MotorEventNotifySet requests
host notification of the event(s) that are generated by motor
and specified by eventMask, and also specified by
the implementation-specific location pointed to by external
(if external is not NULL).
The event notification information in external is
in addition to the event notification information in eventmask,
i.e, the event notification information in eventmask
and in external is not the same information. Note
that eventmask or external can be NULL
(but not both NULL).
Event notification is enabled for event types specified in eventMask,
a bit mask of MPIEventMask bits associated with the desired MPIEventType
values. Event notification is disabled for event types that are
not specified in eventMask. The MPIEventMask bits
must be set of cleared using the MPIEventMask macros.
The mask of event types generated by a Motor object consists of
bits from MPIEventMaskMOTION and MPIEventMaskAXIS.
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