Enum CallbackError 

pub enum CallbackError {
    QueueFull,
}

Why a CallbackHandle::request was rejected.

Note there is no Shutdown variant: a request arriving after the pool has stopped is a silent no-op returning Ok(()), matching C — callbackStop halts the queues and late callbackRequests are simply dropped without surfacing an error to the caller (callback.c:237-284).

Variants

QueueFull

The band’s ring was full — C S_db_bufFull (callback.c:373). Either the push found the ring at capacity, or the overflow latch is still set from a prior full push (callback.c:365).

Trait Implementations

impl Clone for CallbackError

fn clone(&self) -> CallbackError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for CallbackError

impl Debug for CallbackError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for CallbackError

impl PartialEq for CallbackError

fn eq(&self, other: &CallbackError) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for CallbackError