1 // run-pass 2 #![allow(unused_must_use)] 3 // ignore-emscripten no threads support 4 #![feature(rustc_private)] 5 6 extern crate libc; 7 use std::thread; 8 9 mod rustrt { 10 extern crate libc; 11 12 #[link(name = "rust_test_helpers", kind = "static")] 13 extern "C" { rust_dbg_call( cb: extern "C" fn(libc::uintptr_t) -> libc::uintptr_t, data: libc::uintptr_t, ) -> libc::uintptr_t14 pub fn rust_dbg_call( 15 cb: extern "C" fn(libc::uintptr_t) -> libc::uintptr_t, 16 data: libc::uintptr_t, 17 ) -> libc::uintptr_t; 18 } 19 } 20 cb(data: libc::uintptr_t) -> libc::uintptr_t21extern "C" fn cb(data: libc::uintptr_t) -> libc::uintptr_t { 22 if data == 1 { data } else { count(data - 1) + 1 } 23 } 24 count(n: libc::uintptr_t) -> libc::uintptr_t25fn count(n: libc::uintptr_t) -> libc::uintptr_t { 26 unsafe { 27 println!("n = {}", n); 28 rustrt::rust_dbg_call(cb, n) 29 } 30 } 31 main()32pub fn main() { 33 // Make sure we're on a thread with small Rust stacks (main currently 34 // has a large stack) 35 thread::spawn(move || { 36 let result = count(1000); 37 println!("result = {}", result); 38 assert_eq!(result, 1000); 39 }) 40 .join(); 41 } 42