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// run-pass
#![allow(unused_must_use)]
// ignore-emscripten no threads support
#![feature(rustc_private)]
extern crate libc;
use std::thread;
mod rustrt {
extern crate libc;
#[link(name = "rust_test_helpers", kind = "static")]
extern {
pub fn rust_dbg_call(cb: extern "C" fn(libc::uintptr_t) -> libc::uintptr_t,
data: libc::uintptr_t)
-> libc::uintptr_t;
}
}
extern fn cb(data: libc::uintptr_t) -> libc::uintptr_t {
if data == 1 {
data
} else {
count(data - 1) + 1
}
}
fn count(n: libc::uintptr_t) -> libc::uintptr_t {
unsafe {
println!("n = {}", n);
rustrt::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();
}
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