updating docs to mention usage of AtomicBool
Mouse mentioned we should point out that atomic bool is used by the std lib these days. ( https://github.com/m-ou-se/getrandom/pull/1 )
[fuchsia] Update process info struct
The fuchsia platform is in the process of softly transitioning over to
using a new value for ZX_INFO_PROCESS with a new corresponding struct.
This change migrates libstd.
See [fxrev.dev/510478](https://fxrev.dev/510478) and [fxbug.dev/30751](https://fxbug.dev/30751) for more detail.
Stabilize `unreachable_unchecked` as `const fn`
Closes#53188
This PR stabilizes `core::hint::unreachable_unchecked` as `const fn`. MIRI is able to detect when this method is called. Stabilization was delayed until `const_panic` was stabilized so as to avoid users calling this method in its place (thus resulting in runtime UB). With #89508, that is no longer an issue.
````@rustbot```` label +A-const-eval +A-const-fn +T-lang +S-blocked
(not sure why it's T-lang, but that's what the tracking issue is)
Add abstract namespace support for Unix domain sockets
Hello! The other day I wanted to mess around with UDS in Rust and found that abstract namespaces ([unix(7)](https://man7.org/linux/man-pages/man7/unix.7.html)) on Linux still needed development. I took the approach of adding `_addr` specific public functions to reduce conflicts.
Feature name: `unix_socket_abstract`
Tracking issue: #85410
Further context: #42048
## Non-platform specific additions
`UnixListener::bind_addr(&SocketAddr) -> Result<UnixListener>`
`UnixStream::connect_addr(&SocketAddr) -> Result<()>`
`UnixDatagram::bind_addr(&SocketAddr) -> Result<UnixDatagram>`
`UnixDatagram::connect_addr(&SocketAddr) -> Result<()>`
`UnixDatagram::send_to_addr(&self, &[u8], &SocketAddr) -> Result<usize>`
## Platform-specific (Linux) additions
`SocketAddr::from_abstract_namespace(&[u8]) -> SocketAddr`
`SockerAddr::as_abstract_namespace() -> Option<&[u8]>`
## Example
```rust
#![feature(unix_socket_abstract)]
use std::os::unix::net::{UnixListener, SocketAddr};
fn main() -> std::io::Result<()> {
let addr = SocketAddr::from_abstract_namespace(b"namespace")?; // Linux only
let listener = match UnixListener::bind_addr(&addr) {
Ok(sock) => sock,
Err(err) => {
println!("Couldn't bind: {:?}", err);
return Err(err);
}
};
Ok(())
}
```
## Further Details
The main inspiration for the implementation came from the [nix-rust](https://github.com/nix-rust/nix/blob/master/src/sys/socket/addr.rs#L558) crate but there are also other [historical](c4db0685b1) [attempts](https://github.com/tormol/uds/blob/master/src/addr.rs#L324) with similar approaches.
A comment I did have was with this change, we now allow a `SocketAddr` to be constructed explicitly rather than just used almost as a handle for the return of `peer_addr` and `local_addr`. We could consider adding other explicit constructors (e.g. `SocketAddr::from_pathname`, `SockerAddr::from_unnamed`).
Cheers!
Use BCryptGenRandom instead of RtlGenRandom on Windows.
This removes usage of RtlGenRandom on Windows, in favour of BCryptGenRandom.
BCryptGenRandom isn't available on XP, but we dropped XP support a while ago.
The fuchsia platform is in the process of softly transitioning over to
using a new value for ZX_INFO_PROCESS with a new corresponding struct.
This change migrates libstd.
See fxrev.dev/510478 and fxbug.dev/30751 for more detail.
Avoid allocations and copying in Vec::leak
The [`Vec::leak`] method (#62195) is currently implemented by calling `Vec::into_boxed_slice` and `Box::leak`. This shrinks the vector before leaking it, which potentially causes a reallocation and copies the vector's contents.
By avoiding the conversion to `Box`, we can instead leak the vector without any expensive operations, just by returning a slice reference and forgetting the `Vec`. Users who *want* to shrink the vector first can still do so by calling `shrink_to_fit` explicitly.
**Note:** This could break code that uses `Box::from_raw` to “un-leak” the slice returned by `Vec::leak`. However, the `Vec::leak` docs explicitly forbid this, so such code is already incorrect.
[`Vec::leak`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.leak
Optimize VecDeque::append
Optimize `VecDeque::append` to do unsafe copy rather than iterating through each element.
On my `Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz`, the benchmark shows 37% improvements:
```
Master:
custom-bench vec_deque_append 583164 ns/iter
custom-bench vec_deque_append 550040 ns/iter
Patched:
custom-bench vec_deque_append 349204 ns/iter
custom-bench vec_deque_append 368164 ns/iter
```
Additional notes on the context: this is the third attempt to implement a non-trivial version of `VecDeque::append`, the last two are reverted due to unsoundness or regression, see:
- https://github.com/rust-lang/rust/pull/52553, reverted in https://github.com/rust-lang/rust/pull/53571
- https://github.com/rust-lang/rust/pull/53564, reverted in https://github.com/rust-lang/rust/pull/54851
Both cases are covered by existing tests.
Signed-off-by: tabokie <xy.tao@outlook.com>
The PR had some unforseen perf regressions that are not as easy to find.
Revert the PR for now.
This reverts commit 6ae8912a3e7d2c4c775024f58a7ba4b1aedc4073, reversing
changes made to 86d6d2b7389fe1b339402c1798edae8b695fc9ef.
Fix ctrl-c causing reads of stdin to return empty on Windows.
Pressing ctrl+c (or ctrl+break) on Windows caused a blocking read of stdin to unblock and return empty, unlike other platforms which continue to block.
On ctrl-c, `ReadConsoleW` will return success, but also set `LastError` to `ERROR_OPERATION_ABORTED`.
This change detects this case, and re-tries the call to `ReadConsoleW`.
Fixes#89177. See issue for further details.
Tested on Windows 7 and Windows 10 with both MSVC and GNU toolchains
Add `const_eval_select` intrinsic
Adds an intrinsic that calls a given function when evaluated at compiler time, but generates a call to another function when called at runtime.
See https://github.com/rust-lang/const-eval/issues/7 for previous discussion.
r? `@oli-obk.`
Improve `std:🧵:available_parallelism` docs
_Tracking issue: https://github.com/rust-lang/rust/issues/74479_
This PR reworks the documentation of `std:🧵:available_parallelism`, as requested [here](https://github.com/rust-lang/rust/pull/89324#issuecomment-934343254).
## Changes
The following changes are made:
- We've removed prior mentions of "hardware threads" and instead centers the docs around "parallelism" as a resource available to a program.
- We now provide examples of when `available_parallelism` may return numbers that differ from the number of CPU cores in the host machine.
- We now mention that the amount of available parallelism may change over time.
- We make note of which platform components we don't take into account which more advanced users may want to take note of.
- The example has been updated, which should be a bit easier to use.
- We've added a docs alias to `num-cpus` which provides similar functionality to `available_parallelism`, and is one of the most popular crates on crates.io.
---
Thanks!
r? `@BurntSushi`
The unifying theme for this commit is weak, admittedly. I put together a
list of "expensive" functions when I originally proposed this whole
effort, but nobody's cared about that criterion. Still, it's a decent
way to bite off a not-too-big chunk of work.
Given the grab bag nature of this commit, the messages I used vary quite
a bit.
fix minor spelling error in Poll::ready docs
Fixes minor spelling error in the proposed `Poll::ready` docs. Not that my opinion matters, but +1 on the original PR (#89651), it reads much nicer to me than the `ready!` macro.
Add #[must_use] to is_condition tests
I threw in `std::path::Path::has_root` for funsies.
A continuation of #89718.
Parent issue: #89692
r? ```@joshtriplett```
Add #[must_use] to non-mutating verb methods
These are methods that could be misconstrued to mutate their input, similar to #89694. I gave each one a different custom message.
I wrote that `upgrade` and `downgrade` don't modify the input pointers. Logically they don't, but technically they do...
Parent issue: #89692
r? ```@joshtriplett```
Add #[must_use] to From::from and Into::into
Risk of churn: **High**
Magic 8-Ball says: **Outlook not so good**
I figured I'd put this out there. If we don't do it now maybe we save it for a rainy day.
Parent issue: #89692
r? `@joshtriplett`
