mpi.probe uses the source and tag of incoming message to set a
mpi.iprobe does the same except it is a nonblocking call,
i.e., returns immediately.
the source of incoming message or mpi.any.source() for any source.
a tag number or mpi.any.tag() for any tag.
a communicator number
a status number
mpi.send or other nonblocking sends are used to send
a message, the receiver may not know the exact length before receiving
mpi.probe is used to probe the incoming message and put some
information into a status. Then the exact length can be found by using
mpi.get.count to such a status. If the wild card
mpi.any.tag are used, then one
mpi.get.sourcetag to find the exact source or tag of
mpi.probe returns 1 only after a matching message has been found.
mpi.iproble returns TRUE if there is a message that can be
received; FALSE otherwise.
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