Function mpi::ffi::PMPI_Win_allocate

pub unsafe extern fn PMPI_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