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Add AtomicPtr::null #150736

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rust-bors merged 2 commits into from
Jan 8, 2026
+18 −0
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Add AtomicPtr::null #150736

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af69f15
Add AtomicPtr::null
orlp Jan 6, 2026
fff9c62
Add feature to doc example
orlp Jan 6, 2026
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18 changes: 18 additions & 0 deletions library/core/src/sync/atomic.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1550,6 +1550,24 @@ impl<T> AtomicPtr<T> {
unsafe { &*ptr.cast() }
}

/// Creates a new `AtomicPtr` initialized with a null pointer.
///
/// # Examples
///
/// ```
/// #![feature(atomic_ptr_null)]
/// use std::sync::atomic::{AtomicPtr, Ordering};
///
/// let atomic_ptr = AtomicPtr::<()>::null();
/// assert!(atomic_ptr.load(Ordering::Relaxed).is_null());
/// ```
#[inline]
#[must_use]
#[unstable(feature = "atomic_ptr_null", issue = "150733")]
pub const fn null() -> AtomicPtr<T> {
AtomicPtr::new(crate::ptr::null_mut())
}

/// Returns a mutable reference to the underlying pointer.
///
/// This is safe because the mutable reference guarantees that no other threads are
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