In C status is a structure of type MPI_Status
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status.source gives actual source process
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status.tag gives the actual message tag
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In Fortran the status is an integer array and different elements give:
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in status(MPI_SOURCE) the actual source process
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in status(MPI_TAG) the actual message tag
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In C and Fortran, the number of elements (called count) in the message can be found from call to
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MPI_GET_COUNT (IN status, IN datatype,
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OUT count, OUT error_message)
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where as usual in C last argument is missing as returned in function call
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