Function mpi::ffi::MPI_Compare_and_swap

pub unsafe extern fn MPI_Compare_and_swap(origin_addr: *const c_void,
                                          compare_addr: *const c_void,
                                          result_addr: *mut c_void,
                                          datatype: MPI_Datatype,
                                          target_rank: c_int,
                                          target_disp: MPI_Aint,
                                          win: MPI_Win)
                                          -> c_int