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This commit is extracted from #122036 and adds a new directive to the `compiletest` test runner, `//@ needs-threads`. This is intended to capture the need that a target must implement threading to execute a specific test, typically one that uses `std::thread`. This is primarily done for WebAssembly targets which currently do not have threads by default. This enables transitioning a lot of `//@ ignore-wasm*`-style ignores into a more self-documenting `//@ needs-threads` directive. Additionally the `wasm32-wasi-preview1-threads` target, for example, does actually have threads, but isn't tested in CI at this time. This change enables running these tests for that target, but not other wasm targets.
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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