Enum ExecutorServiceBuilderError 

pub enum ExecutorServiceBuilderError {
    ZeroPoolSize,
    ZeroMaximumPoolSize,
    CorePoolSizeExceedsMaximum {
        core_pool_size: usize,
        maximum_pool_size: usize,
    },
    ZeroQueueCapacity,
    ZeroStackSize,
    ZeroKeepAlive,
    SpawnWorker {
        index: Option<usize>,
        source: Error,
    },
}

Error returned when an executor service cannot be built.

This error is shared by executor-service implementations whose construction may validate worker, queue, timeout, stack, or thread-spawn configuration.

Variants

ZeroPoolSize

The configured fixed worker count is zero.

ZeroMaximumPoolSize

The configured maximum pool size is zero.

CorePoolSizeExceedsMaximum

The configured core pool size is greater than the maximum pool size.

Fields

core_pool_size: usize

Configured core pool size.

maximum_pool_size: usize

Configured maximum pool size.

ZeroQueueCapacity

The configured bounded queue capacity is zero.

ZeroStackSize

The configured worker stack size is zero.

ZeroKeepAlive

The configured keep-alive timeout is zero.

SpawnWorker

A worker thread could not be spawned.

Fields

index: Option<usize>

Index of the worker that failed to spawn when the builder knows it.

source: Error

I/O error reported by std::thread::Builder::spawn.

Implementations

impl ExecutorServiceBuilderError

pub fn from_submission_error(error: SubmissionError) -> Self

Converts a runtime worker-spawn rejection into a build error.

Parameters

• error - Rejection produced while prestarting workers during build.

Returns

A build error carrying equivalent failure context.

Trait Implementations

impl Debug for ExecutorServiceBuilderError

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

Formats the value using the given formatter.

impl Display for ExecutorServiceBuilderError

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

Formats the value using the given formatter.

impl Error for ExecutorServiceBuilderError

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<SubmissionError> for ExecutorServiceBuilderError

fn from(error: SubmissionError) -> Self

Converts rejected-execution reasons into build-time executor errors.

Parameters

• error - Rejection reason observed during service construction.

Returns

A build error that preserves equivalent failure context.