MPI_Iprobe - Provides a nonblocking test for a message
SYNOPSIS
       C:
            #include <mpi.h>
            int MPI_Iprobe( source, tag, comm, flag, status )
            int         source;
            int         tag;
            int         *flag;
            MPI_Comm    comm;
            MPI_Status  *status;
       C++:
            #include <mpi.h>
            bool Comm::Iprobe(
            int               source,
            int               tag) const
       Fortran:
            INCLUDE "mpif.h" (or USE MPI)
            LOGICAL flag
            INTEGER source, tag, comm, status(MPI_STATUS_SIZE), ierror
            CALL MPI_IPROBE(source, tag, comm, flag, status(MPI_STATUS_SIZE), ierror)
STANDARDS
       This release implements the MPI 1.2 standard, as
       documented by the MPI Forum in the spring 1997 release of
       MPI:  A Message Passing Interface Standard.
DESCRIPTION
       The MPI_Iprobe routine provides a nonblocking test for a
       message.  This routine accepts the following parameters:
       source    Specifes a source rank or MPI_ANY_SOURCE
                 (integer)
       tag       Specifies a tag value or MPI_ANY_TAG (integer)
       comm      Specifies the communicator (handle)
       flag      Returns a value of true if the operation
                 completed (logical)
       ierror    Specifies the return code value for successful
                 completion, which is in MPI_SUCCESS.
                 MPI_SUCCESS is defined in the mpif.h file.
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