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use crate::boxed::Box;
use crate::cell::RefCell;
use crate::pin::Pin;
use crate::sync::Arc;
use crate::sys_common::remutex::{ReentrantMutex, ReentrantMutexGuard};
use crate::thread;
#[test]
fn smoke() {
let m = unsafe {
let mut m = Box::pin(ReentrantMutex::new(()));
m.as_mut().init();
m
};
let m = m.as_ref();
{
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 = unsafe {
// FIXME: Simplify this if Arc gets an Arc::get_pin_mut.
let mut m = Arc::new(ReentrantMutex::new(RefCell::new(0)));
Pin::new_unchecked(Arc::get_mut_unchecked(&mut m)).init();
Pin::new_unchecked(m)
};
let m2 = m.clone();
let lock = m.as_ref().lock();
let child = thread::spawn(move || {
let lock = m2.as_ref().lock();
assert_eq!(*lock.borrow(), 4950);
});
for i in 0..100 {
let lock = m.as_ref().lock();
*lock.borrow_mut() += i;
}
drop(lock);
child.join().unwrap();
}
#[test]
fn trylock_works() {
let m = unsafe {
// FIXME: Simplify this if Arc gets an Arc::get_pin_mut.
let mut m = Arc::new(ReentrantMutex::new(()));
Pin::new_unchecked(Arc::get_mut_unchecked(&mut m)).init();
Pin::new_unchecked(m)
};
let m2 = m.clone();
let _lock = m.as_ref().try_lock();
let _lock2 = m.as_ref().try_lock();
thread::spawn(move || {
let lock = m2.as_ref().try_lock();
assert!(lock.is_none());
})
.join()
.unwrap();
let _lock3 = m.as_ref().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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