Function mpi::ffi::PMPI_Irecv

pub unsafe extern fn PMPI_Irecv(buf: *mut c_void,
                                count: c_int,
                                datatype: MPI_Datatype,
                                source: c_int,
                                tag: c_int,
                                comm: MPI_Comm,
                                request: *mut MPI_Request)
                                -> c_int