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NotifyEvent first checks to
see if the type field of status matches a bit in the
event mask maintained by a Notify object (notify).
IF
the type field of status matches a bit in the event
mask,
AND
the event source list maintained by the Notify object (notify)
is empty or the source field of status
matches a source in the event source list,
THEN
a Notify object (notify) will place the event in a FIFO event queue
and signal that an event has been received.
If a thread is waiting for event notification (after having called
mpiNotifyEventWait(notify)), the signal will awaken it. Otherwise,
the next call to mpiNotifyEventWait(notify) will return immediately
with status.
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