| //@ run-pass |
| //@ needs-threads |
| // This time we're testing repeatedly going up and down both stacks to |
| // make sure the stack pointers are maintained properly in both |
| // directions |
| |
| use std::thread; |
| |
| #[link(name = "rust_test_helpers", kind = "static")] |
| extern "C" { |
| pub fn rust_dbg_call( |
| cb: extern "C" fn(u64) -> u64, |
| data: u64, |
| ) -> u64; |
| } |
| |
| extern "C" fn cb(data: u64) -> u64 { |
| if data == 1 { data } else { count(data - 1) + count(data - 1) } |
| } |
| |
| fn count(n: u64) -> u64 { |
| unsafe { |
| println!("n = {}", n); |
| rust_dbg_call(cb, n) |
| } |
| } |
| |
| pub fn main() { |
| // Make sure we're on a thread with small Rust stacks (main currently |
| // has a large stack) |
| thread::spawn(move || { |
| let result = count(12); |
| println!("result = {}", result); |
| assert_eq!(result, 2048); |
| }) |
| .join().unwrap(); |
| } |
