// ignore-windows: Concurrency on Windows is not supported yet.

// Joining the same thread from multiple threads is undefined behavior.

#![feature(rustc_private)]

extern crate libc;

use std::thread;
use std::{mem, ptr};

extern "C" fn thread_start(_null: *mut libc::c_void) -> *mut libc::c_void {
    thread::yield_now();
    thread::yield_now();
    ptr::null_mut()
}

fn main() {
    unsafe {
        let mut native: libc::pthread_t = mem::zeroed();
        let attr: libc::pthread_attr_t = mem::zeroed();
        // assert_eq!(libc::pthread_attr_init(&mut attr), 0); FIXME: this function is not yet implemented.
        assert_eq!(libc::pthread_create(&mut native, &attr, thread_start, ptr::null_mut()), 0);
        let mut native_copy: libc::pthread_t = mem::zeroed();
        ptr::copy_nonoverlapping(&native, &mut native_copy, 1);
        let handle = thread::spawn(move || {
            assert_eq!(libc::pthread_join(native_copy, ptr::null_mut()), 0); //~ ERROR: Undefined Behavior: trying to join a detached or already joined thread
        });
        assert_eq!(libc::pthread_join(native, ptr::null_mut()), 0);
        handle.join().unwrap();
    }
}

// ignore-windows: Concurrency on Windows is not supported yet.

// Joining the same thread from multiple threads is undefined behavior.

#![feature(rustc_private)]

extern crate libc;

use std::thread;
use std::{mem, ptr};

extern "C" fn thread_start(_null: *mut libc::c_void) -> *mut libc::c_void {
    ptr::null_mut()
}

fn main() {
    unsafe {
        let mut native: libc::pthread_t = mem::zeroed();
        let attr: libc::pthread_attr_t = mem::zeroed();
        // assert_eq!(libc::pthread_attr_init(&mut attr), 0); FIXME: this function is not yet implemented.
        assert_eq!(libc::pthread_create(&mut native, &attr, thread_start, ptr::null_mut()), 0);
        let mut native_copy: libc::pthread_t = mem::zeroed();
        ptr::copy_nonoverlapping(&native, &mut native_copy, 1);
        let handle = thread::spawn(move || {
            assert_eq!(libc::pthread_join(native_copy, ptr::null_mut()), 0); //~ ERROR: Undefined Behavior: trying to join a detached or already joined thread
        });
        assert_eq!(libc::pthread_join(native, ptr::null_mut()), 0);
        handle.join().unwrap();
    }
}

--- 
+++ 
@@ -10,6 +10,8 @@
 use std::{mem, ptr};
 
 extern "C" fn thread_start(_null: *mut libc::c_void) -> *mut libc::c_void {
+    thread::yield_now();
+    thread::yield_now();
     ptr::null_mut()
 }
 
Make multiple threads to try to join a thread while it is still running.
