42 lines
1.4 KiB
Rust
42 lines
1.4 KiB
Rust
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(const_fn, drop_types_in_const)]
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#![feature(cfg_target_thread_local, thread_local_internals)]
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type Foo = std::cell::RefCell<String>;
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#[cfg(target_thread_local)]
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static __KEY: std::thread::__FastLocalKeyInner<Foo> =
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std::thread::__FastLocalKeyInner::new();
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#[cfg(not(target_thread_local))]
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static __KEY: std::thread::__OsLocalKeyInner<Foo> =
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std::thread::__OsLocalKeyInner::new();
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fn __getit() -> std::option::Option<
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&'static std::cell::UnsafeCell<
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std::option::Option<Foo>>>
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{
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__KEY.get() //~ ERROR invocation of unsafe method requires unsafe
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}
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static FOO: std::thread::LocalKey<Foo> =
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std::thread::LocalKey::new(__getit, Default::default);
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//~^ ERROR call to unsafe function requires 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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}).join().unwrap();
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FOO.with(|foo| println!("{}", foo.borrow()));
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}
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