Enum Threads 

pub enum Threads {
    Auto,
    Fixed(usize),
}

Worker threads of a search.

Variants

Auto

auto_threads, read again by every search.

Fixed(usize)

Exactly this many workers (0 counts as 1).

Implementations

impl Threads

pub fn count(self) -> usize

The thread count for a search starting now (at least 1).

pub fn most(self) -> usize

The most workers Threads::wait_turn ever lets run at once.

pub fn wait_turn(self, k: usize, stop: impl Fn() -> bool)

For a long search that starts Threads::most workers: hold worker k back (between units of work) while auto_threads allows fewer than k + 1, or until stop(). The count shrinks as other processes start scans and grows back as they finish, which a count read once at the start cannot follow: every process of a burst would see the others idle and take every CPU.

Trait Implementations

impl Clone for Threads

fn clone(&self) -> Threads

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Threads

impl Debug for Threads

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

Formats the value using the given formatter.

impl Default for Threads

fn default() -> Threads

Returns the “default value” for a type.

impl Eq for Threads

impl From<Option<usize>> for Threads

None (no --threads) is Threads::Auto.

fn from(n: Option<usize>) -> Threads

Converts to this type from the input type.

impl From<usize> for Threads

fn from(n: usize) -> Threads

Converts to this type from the input type.

impl PartialEq for Threads

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Threads