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use crate::park::Unpark;
use crate::time::driver::Inner;
use crate::time::Instant;
use loom::thread;
use std::sync::atomic::Ordering;
use std::sync::Arc;
struct MockUnpark;
impl Unpark for MockUnpark {
fn unpark(&self) {}
}
#[test]
fn balanced_incr_and_decr() {
const OPS: usize = 100;
fn incr(inner: Arc<Inner>) {
for _ in 0..OPS {
inner.increment().expect("increment should not have failed");
thread::yield_now();
}
}
fn decr(inner: Arc<Inner>) {
let mut ops_performed = 0;
while ops_performed < OPS {
if inner.num(Ordering::Relaxed) > 0 {
ops_performed += 1;
inner.decrement();
}
thread::yield_now();
}
}
loom::model(|| {
let unpark = Box::new(MockUnpark);
let instant = Instant::now();
let inner = Arc::new(Inner::new(instant, unpark));
let incr_inner = inner.clone();
let decr_inner = inner.clone();
let incr_hndle = thread::spawn(move || incr(incr_inner));
let decr_hndle = thread::spawn(move || decr(decr_inner));
incr_hndle.join().expect("should never fail");
decr_hndle.join().expect("should never fail");
assert_eq!(inner.num(Ordering::SeqCst), 0);
})
}
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