1 // ignore-windows: No libc on Windows
2
3 // Joining the same thread from multiple threads is undefined behavior.
4
5 #![feature(rustc_private)]
6
7 extern crate libc;
8
9 use std::thread;
10 use std::{mem, ptr};
11
thread_start(_null: *mut libc::c_void) -> *mut libc::c_void12 extern "C" fn thread_start(_null: *mut libc::c_void) -> *mut libc::c_void {
13 // Yield the thread several times so that other threads can join it.
14 thread::yield_now();
15 thread::yield_now();
16 ptr::null_mut()
17 }
18
main()19 fn main() {
20 unsafe {
21 let mut native: libc::pthread_t = mem::zeroed();
22 let attr: libc::pthread_attr_t = mem::zeroed();
23 // assert_eq!(libc::pthread_attr_init(&mut attr), 0); FIXME: this function is not yet implemented.
24 assert_eq!(libc::pthread_create(&mut native, &attr, thread_start, ptr::null_mut()), 0);
25 let mut native_copy: libc::pthread_t = mem::zeroed();
26 ptr::copy_nonoverlapping(&native, &mut native_copy, 1);
27 let handle = thread::spawn(move || {
28 assert_eq!(libc::pthread_join(native_copy, ptr::null_mut()), 0); //~ ERROR: Undefined Behavior: trying to join a detached or already joined thread
29 });
30 assert_eq!(libc::pthread_join(native, ptr::null_mut()), 0);
31 handle.join().unwrap();
32 }
33 }
34