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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::libc;
use std::task;
mod rustrt {
use std::libc;
#[link(name = "rustrt")]
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 == 1u {
data
} else {
count(data - 1u) + 1u
}
}
fn count(n: uint) -> uint {
unsafe {
println!("n = {}", n);
rustrt::rust_dbg_call(cb, n)
}
}
pub fn main() {
// Make sure we're on a task with small Rust stacks (main currently
// has a large stack)
task::spawn(proc() {
let result = count(1000u);
println!("result = {}", result);
assert_eq!(result, 1000u);
});
}
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