Struct SpscRing 

pub struct SpscRing<T: Copy + Default> { /* private fields */ }

Lock-free single-producer single-consumer ring buffer.

The hot path for audio data. No heap allocation after initialization. Uses atomic head/tail pointers with cache-line padding to prevent false sharing.

Performance

• Wait-free on the fast path (atomic store/load only)
• Power-of-two capacity for bitwise modulo (single-cycle AND vs multi-cycle DIV)
• Bounded memory, no allocation after init

Safety

This buffer is safe for concurrent use by exactly one producer and one consumer. Multiple producers or multiple consumers will cause data races.

Implementations

impl<T: Copy + Default> SpscRing<T>

pub fn new(capacity: usize) -> Self

Create a new ring buffer with the given capacity.

Capacity is rounded up to the next power of two for efficient modulo.

Panics

Panics if capacity is 0.

pub fn capacity(&self) -> usize

Returns the usable capacity of the buffer.

pub fn len(&self) -> usize

Returns the number of items currently available to read.

pub fn is_empty(&self) -> bool

Returns true if the buffer is empty.

pub fn available(&self) -> usize

Returns the number of free slots available for writing.

pub fn write(&self, data: &[T]) -> usize

Write samples into the ring buffer.

Returns the number of samples actually written (may be less than data.len() if the buffer is nearly full).

This is the producer method — call from exactly one thread.

pub fn read(&self, out: &mut [T]) -> usize

Read samples from the ring buffer into out.

Returns the number of samples actually read (may be less than out.len() if the buffer has fewer samples available).

This is the consumer method — call from exactly one thread.

pub fn clear(&self)

Discard all buffered data without reading it.

Trait Implementations

impl<T: Copy + Default + Send> Send for SpscRing<T>

impl<T: Copy + Default + Send> Sync for SpscRing<T>