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//@ run-pass
//@ needs-threads
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 ) + 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(1000);
println!("result = {}", result);
assert_eq!(result, 1000);
})
.join().unwrap();
}
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