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