rust/src/libstd/sync, branch 1.29.2

Merge remote-tracking branches 'ljedrz/dyn_libcore', 'ljedrz/dyn_libstd' and 'ljedrz/dyn_libterm' into dyn-rollup

2018-07-25T01:25:02+00:00

sync::Once: Use Acquire on the hot path, and explain why we don't use it elsewhere

2018-07-17T18:51:31+00:00

Uncapitalize "If"

2018-07-12T00:19:41+00:00

remove sync::Once::call_once 'static

2018-07-11T02:47:59+00:00

- [std: Rewrite the `sync` modulehttps://github.com/rust-lang/rust/commit/71d4e77db8ad4b6d821da7e5d5300134ac95974e) (Nov 2014) ```diff - pub fn doit(&self, f: ||) { + pub fn doit(&'static self, f: ||) { ``` > ```text > The second layer is the layer provided by `std::sync` which is intended to be > the thinnest possible layer on top of `sys_common` which is entirely safe to > use. There are a few concerns which need to be addressed when making these > system primitives safe: > > * Once used, the OS primitives can never be **moved**. This means that they > essentially need to have a stable address. The static primitives use > `&'static self` to enforce this, and the non-static primitives all use a > `Box` to provide this guarantee. > ``` The author of this diff is @alexcrichton. `sync::Once` contains only a pointer to (privately hidden) `Waiter`s, which are all stack-allocated. The `'static` bound to `sync::Once` is thus unnecessary to guarantee that any OS primitives are non-relocatable. See https://internals.rust-lang.org/t/sync-once-per-instance/7918 for more context.

Deny bare trait objects in `src/libstd`.

2018-07-10T18:35:36+00:00

Rename alloc::arc to alloc::sync, to match std::sync

2018-06-29T12:01:33+00:00

libstd: add an RAII utility for sys_common::mutex::Mutex

2018-06-17T07:18:32+00:00

Signed-off-by: NODA, Kai

Update the `Once` docs to use `Once::new`

2018-05-24T12:09:42+00:00

Add `Once::new` as a way of constructing a `Once`

2018-05-24T12:08:47+00:00

Add explanation for #[must_use] on mutex guards

2018-05-07T17:26:28+00:00