Enum RejectedExecution 

pub enum RejectedExecution {
    Shutdown,
    Saturated,
    WorkerSpawnFailed {
        source: Arc<Error>,
    },
}

Error returned when an executor service refuses to accept a task.

This error is about task acceptance only. It does not describe task execution success or failure; accepted tasks report their final result through the handle returned by the service.

Variants

Shutdown

The service has been shut down and no longer accepts new tasks.

Saturated

The service is saturated and cannot accept more tasks.

WorkerSpawnFailed

The service accepted the task conceptually but could not create the worker thread required to execute it.

Fields

source: Arc<Error>

I/O error reported while spawning the worker.

Trait Implementations

impl Clone for RejectedExecution

fn clone(&self) -> RejectedExecution

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RejectedExecution

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

Formats the value using the given formatter.

impl Display for RejectedExecution

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

Formats the value using the given formatter.

impl Error for RejectedExecution

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<RejectedExecution> for ThreadPoolBuildError

fn from(error: RejectedExecution) -> Self

Converts rejected-execution reasons into build-time thread-pool errors.

Parameters

• error - Rejection reason observed during thread prestart.

Returns

A build error that preserves equivalent failure context.

impl PartialEq for RejectedExecution

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

Compares rejection categories.

Worker spawn failures compare equal by variant because io::Error does not provide value equality.

Parameters

• other - Rejection value to compare with this value.

Returns

true when both values have the same rejection category.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for RejectedExecution