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//@ run-pass
#![allow(stable_features)]
//@ needs-threads
#![feature(thread_local_try_with)]
use std::sync::atomic::{AtomicUsize, Ordering};
use std::thread;
struct Foo {
cnt: usize,
}
thread_local!(static FOO: Foo = Foo::init());
static CNT: AtomicUsize = AtomicUsize::new(0);
impl Foo {
fn init() -> Foo {
let cnt = CNT.fetch_add(1, Ordering::SeqCst);
if cnt == 0 {
FOO.with(|_| {});
}
Foo { cnt: cnt }
}
}
impl Drop for Foo {
fn drop(&mut self) {
if self.cnt == 1 {
FOO.with(|foo| assert_eq!(foo.cnt, 0));
} else {
assert_eq!(self.cnt, 0);
if FOO.try_with(|_| ()).is_ok() {
panic!("should not be in valid state");
}
}
}
}
fn main() {
thread::spawn(|| {
FOO.with(|_| {});
})
.join()
.unwrap();
}
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