Two MPI_Irecv calls are made specifying different buffers and tags, but the same sender and request location. How can one determine that the buffer specified in the first call has valid data?

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Call MPI_Wait twice with the same request

Two MPI_Irecv calls are made specifying different buffers and tags, but the same sender and request location. How can one determine that the buffer specified in the first call has valid data?

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