Struct ExecutionContext 

pub struct ExecutionContext { /* private fields */ }

Reusable, operation-owned worker pool with deterministic ordered mapping.

The context never installs or mutates Rayon’s global pool. A one-thread context executes closures directly, which also prevents nested pools when Python already schedules independent native batches.

Implementations

impl ExecutionContext

pub fn new(threads: usize) -> Result<Self, ThreadPoolBuildError>

Construct a context with an exact positive worker budget.

Errors

Returns ThreadPoolBuildError when Rayon cannot build the bounded worker pool.

pub const fn serial() -> Self

Return a zero-allocation serial context.

pub const fn threads(&self) -> usize

Return the exact worker budget owned by this context.

pub fn map_ordered<R, F>( &self, item_count: usize, minimum_parallel_items: usize, operation: F, ) -> Vec<R>

where R: Send, F: Fn(usize) -> R + Send + Sync,

Map independent indices while collecting results in increasing order.

Work below minimum_parallel_items remains serial. Indexed Rayon collection preserves the input order independently of completion order.

Trait Implementations

impl Clone for ExecutionContext

fn clone(&self) -> ExecutionContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.