rust/library/std/src/sys/sync/condvar, branch perf-tmp

library: Migrate from `cfg_if` to `cfg_select`

2025-08-16T12:28:31+00:00

Migrate the standard library from using the external `cfg_if` crate to using the now-built-in `cfg_select` macro. This does not yet eliminate the dependency from `library/std/Cargo.toml`, because while the standard library itself no longer uses `cfg_if`, it also incorporates the `backtrace` crate, which does. Migration assisted by the following vim command (after selecting the full `cfg_if!` invocation): ``` '<,'>s/\(cfg_if::\)\?cfg_if/cfg_select/ | '<,'>s/^\( *\)} else {/\1}\r\1_ => {/c | '<,'>s/^\( *\)} else if #\[cfg(\(.*\))\] /\1}\r\1\2 => /e | '<,'>s/if #\[cfg(\(.*\))\] {/\1 => {/e ``` This is imperfect, but substantially accelerated the process. This prompts for confirmation on the `} else {` since that can also appear inside one of the arms. This also requires manual intervention to handle any multi-line conditions.

use generic Atomic type where possible

2025-04-26T23:18:08+00:00

in core/alloc/std only for now, and ignoring test files Co-authored-by: Pavel Grigorenko

Implement Condvar::wait_timeout for targets without threads

2024-12-18T10:33:15+00:00

This always falls back to sleeping since there is no way to notify a condvar on a target without threads.

Rollup merge of #128184 - joboet:refactor_pthread_sync, r=workingjubilee

2024-12-01T07:15:21+00:00

std: refactor `pthread`-based synchronization The non-trivial code for `pthread_condvar` is duplicated across the thread parking and the `Mutex`/`Condvar` implementations. This PR moves that code into `sys::pal`, which now exposes an `unsafe` wrapper type for `pthread_mutex_t` and `pthread_condvar_t`.

std: clarify comments about initialization

2024-11-30T15:22:56+00:00

update cfgs

2024-11-27T15:14:54+00:00

xous: sync: remove `rustc_const_stable` attribute

2024-10-29T14:43:46+00:00

These functions had `#[rustc_const_stable(feature = "const_locks", since = "1.63.0")]` on them because they were originally taken from `no_threads`. with d066dfd these no longer compile. Since other platforms do not have this attribute, remove it. This fixes the build for Xous. Signed-off-by: Sean Cross

std: refactor `pthread`-based synchronization

2024-10-28T15:56:22+00:00

The non-trivial code for `pthread_condvar` is duplicated across the thread parking and the `Mutex`/`Condvar` implementations. This PR moves that code into `sys::pal`, which now exposes a non-movable wrapper type for `pthread_mutex_t` and `pthread_condvar_t`.

we can now enable the 'const stable fn must be stable' check

2024-10-28T10:48:39+00:00

library: consistently use American spelling for 'behavior'

2024-10-25T10:02:47+00:00