Function mpi::ffi::PMPI_Igatherv

pub unsafe extern fn PMPI_Igatherv(sendbuf: *const c_void,
                                   sendcount: c_int,
                                   sendtype: MPI_Datatype,
                                   recvbuf: *mut c_void,
                                   recvcounts: *const c_int,
                                   displs: *const c_int,
                                   recvtype: MPI_Datatype,
                                   root: c_int,
                                   comm: MPI_Comm,
                                   request: *mut MPI_Request)
                                   -> c_int