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use super::{ReentrantMutex, ReentrantMutexGuard};
use crate::cell::RefCell;
use crate::sync::Arc;
use crate::thread;
#[test]
fn smoke() {
let m = ReentrantMutex::new(());
{
let a = m.lock();
{
let b = m.lock();
{
let c = m.lock();
assert_eq!(*c, ());
}
assert_eq!(*b, ());
}
assert_eq!(*a, ());
}
}
#[test]
fn is_mutex() {
let m = Arc::new(ReentrantMutex::new(RefCell::new(0)));
let m2 = m.clone();
let lock = m.lock();
let child = thread::spawn(move || {
let lock = m2.lock();
assert_eq!(*lock.borrow(), 4950);
});
for i in 0..100 {
let lock = m.lock();
*lock.borrow_mut() += i;
}
drop(lock);
child.join().unwrap();
}
#[test]
fn trylock_works() {
let m = Arc::new(ReentrantMutex::new(()));
let m2 = m.clone();
let _lock = m.try_lock();
let _lock2 = m.try_lock();
thread::spawn(move || {
let lock = m2.try_lock();
assert!(lock.is_none());
})
.join()
.unwrap();
let _lock3 = m.try_lock();
}
pub struct Answer<'a>(pub ReentrantMutexGuard<'a, RefCell<u32>>);
impl Drop for Answer<'_> {
fn drop(&mut self) {
*self.0.borrow_mut() = 42;
}
}
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