Function mpi::ffi::MPI_Irecv

pub unsafe extern fn MPI_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