Function mpi::ffi::MPI_Win_allocate

pub unsafe extern fn MPI_Win_allocate(size: MPI_Aint,
                                      disp_unit: c_int,
                                      info: MPI_Info,
                                      comm: MPI_Comm,
                                      baseptr: *mut c_void,
                                      win: *mut MPI_Win)
                                      -> c_int