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Add UnwindSafe to Once #90625

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Merged
merged 2 commits into from
Dec 23, 2021
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Add UnwindSafe to Once #90625

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8ad6e5f
Add UnwindSafe to Once
Milo123459 Nov 5, 2021
91161ed
impl RefUnwindSafe for Once
dtolnay Dec 20, 2021
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7 changes: 7 additions & 0 deletions library/std/src/sync/once.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -90,6 +90,7 @@ mod tests;
use crate::cell::Cell;
use crate::fmt;
use crate::marker;
use crate::panic::{RefUnwindSafe, UnwindSafe};
use crate::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
use crate::thread::{self, Thread};

Expand Down Expand Up @@ -123,6 +124,12 @@ unsafe impl Sync for Once {}
#[stable(feature = "rust1", since = "1.0.0")]
unsafe impl Send for Once {}

#[stable(feature = "sync_once_unwind_safe", since = "1.59.0")]
impl UnwindSafe for Once {}

#[stable(feature = "sync_once_unwind_safe", since = "1.59.0")]
impl RefUnwindSafe for Once {}

/// State yielded to [`Once::call_once_force()`]’s closure parameter. The state
/// can be used to query the poison status of the [`Once`].
#[stable(feature = "once_poison", since = "1.51.0")]
Expand Down