a9c1152c4b
This commit removes the `std::local_data` module in favor of a new
`std::thread_local` module providing thread local storage. The module provides
two variants of TLS: one which owns its contents and one which is based on
scoped references. Each implementation has pros and cons listed in the
documentation.
Both flavors have accessors through a function called `with` which yield a
reference to a closure provided. Both flavors also panic if a reference cannot
be yielded and provide a function to test whether an access would panic or not.
This is an implementation of [RFC 461][rfc] and full details can be found in
that RFC.
This is a breaking change due to the removal of the `std::local_data` module.
All users can migrate to the new thread local system like so:
thread_local!(static FOO: Rc<RefCell<Option<T>>> = Rc::new(RefCell::new(None)))
The old `local_data` module inherently contained the `Rc<RefCell<Option<T>>>` as
an implementation detail which must now be explicitly stated by users.
[rfc]: https://github.com/rust-lang/rfcs/pull/461
[breaking-change]
35 lines
909 B
Rust
35 lines
909 B
Rust
// Copyright 2014 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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// force-host
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#![feature(plugin_registrar)]
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extern crate rustc;
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use std::any::Any;
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use std::cell::RefCell;
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use rustc::plugin::Registry;
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struct Foo {
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foo: int
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}
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impl Drop for Foo {
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fn drop(&mut self) {}
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}
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#[plugin_registrar]
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pub fn registrar(_: &mut Registry) {
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thread_local!(static FOO: RefCell<Option<Box<Any+Send>>> = RefCell::new(None));
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FOO.with(|s| *s.borrow_mut() = Some(box Foo { foo: 10 } as Box<Any+Send>));
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}
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