rust/tests/fail/sync/libc_pthread_rwlock_read_wrong_owner.rs

//@ignore-target-windows: No libc on Windows

#![feature(rustc_private)]

use std::cell::UnsafeCell;
use std::sync::Arc;
use std::thread;

struct RwLock(UnsafeCell<libc::pthread_rwlock_t>);

unsafe impl Send for RwLock {}
unsafe impl Sync for RwLock {}

fn new_lock() -> Arc<RwLock> {
    Arc::new(RwLock(UnsafeCell::new(libc::PTHREAD_RWLOCK_INITIALIZER)))
}

fn main() {
    unsafe {
        let lock = new_lock();
        assert_eq!(libc::pthread_rwlock_rdlock(lock.0.get() as *mut _), 0);

        let lock_copy = lock.clone();
        thread::spawn(move || {
            assert_eq!(libc::pthread_rwlock_unlock(lock_copy.0.get() as *mut _), 0); //~ ERROR: Undefined Behavior: unlocked an rwlock that was not locked by the active thread
        })
        .join()
        .unwrap();
    }
}