mirror of https://github.com/rust-lang/rust
33 lines
988 B
Rust
33 lines
988 B
Rust
//@ needs-threads
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#![feature(thread_local)]
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#![feature(cfg_target_thread_local, thread_local_internals)]
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use std::cell::RefCell;
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type Foo = std::cell::RefCell<String>;
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#[cfg(target_thread_local)]
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#[thread_local]
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static __KEY: std::thread::local_impl::Key<Foo> = std::thread::local_impl::Key::new();
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#[cfg(not(target_thread_local))]
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static __KEY: std::thread::local_impl::Key<Foo> = std::thread::local_impl::Key::new();
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fn __getit(_: Option<&mut Option<RefCell<String>>>) -> std::option::Option<&'static Foo> {
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__KEY.get(Default::default)
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//~^ ERROR call to unsafe function `Key::<T>::get` is unsafe
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}
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static FOO: std::thread::LocalKey<Foo> = std::thread::LocalKey::new(__getit);
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//~^ ERROR call to unsafe function `LocalKey::<T>::new` is unsafe
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fn main() {
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FOO.with(|foo| println!("{}", foo.borrow()));
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std::thread::spawn(|| {
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FOO.with(|foo| *foo.borrow_mut() += "foo");
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})
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.join()
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.unwrap();
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FOO.with(|foo| println!("{}", foo.borrow()));
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}
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