Struct io_uring::cqueue::CompletionQueue

pub struct CompletionQueue { /* fields omitted */ }

An io_uring instance's completion queue. This stores all the I/O operations that have completed.

Implementations

impl CompletionQueue

pub fn overflow(&self) -> u32

If queue is full and is_feature_nodrop is not set, new events may be dropped. This records the number of dropped events.

pub fn eventfd_disabled(&self) -> bool

Whether eventfd notifications are disabled when a request is completed and queued to the CQ ring. This library currently does not provide a way to set it, so this will always be false.

Requires the unstable feature.

pub fn capacity(&self) -> usize

Get the total number of entries in the completion queue ring buffer.

pub fn len(&self) -> usize

Get the number of unread completion queue events in the ring buffer.

pub fn is_empty(&self) -> bool

Returns true if there are no completion queue events to be processed.

pub fn is_full(&self) -> bool

Returns true if the completion queue is at maximum capacity. If is_feature_nodrop is not set, this will cause any new completion queue events to be dropped by the kernel.

pub fn available(&mut self) -> AvailableQueue<'_>

Take a snapshot of the completion queue.