Function dsgesv 

pub unsafe fn dsgesv(
    layout: Layout,
    n: i32,
    nrhs: i32,
    a: &mut [f64],
    lda: i32,
    ipiv: &mut [i32],
    b: &mut [f64],
    ldb: i32,
    x: &mut [f64],
    ldx: i32,
    iter: &mut i32,
) -> i32