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