Struct DoubleCheckedLock 

pub struct DoubleCheckedLock;

Entry type for one-shot double-checked lock execution.

This API is useful when you do not need to keep a reusable executor instance. It delegates to DoubleCheckedLockExecutor internally.

Examples

use std::sync::{Arc, atomic::{AtomicBool, Ordering}};

use qubit_dcl::{ArcMutex, DoubleCheckedLock, Lock};

let data = ArcMutex::new(10);
let skip = Arc::new(AtomicBool::new(false));

let result = DoubleCheckedLock::on(data.clone())
    .when({
        let skip = skip.clone();
        move || !skip.load(Ordering::Acquire)
    })
    .call_with(|value: &mut i32| {
        *value += 5;
        Ok::<i32, std::io::Error>(*value)
    })
    .get_result();

assert!(result.is_success());
assert_eq!(data.read(|value| *value), 15);

Implementations

impl DoubleCheckedLock

pub fn on<L, T>(lock: L) -> DoubleCheckedLockBuilder<L, T>

where L: Lock<T>,

Starts one-shot double-checked lock configuration by attaching a lock.

Trait Implementations

impl Clone for DoubleCheckedLock

fn clone(&self) -> DoubleCheckedLock

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DoubleCheckedLock

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

Formats the value using the given formatter.

impl Default for DoubleCheckedLock

fn default() -> DoubleCheckedLock

Returns the “default value” for a type.

impl Copy for DoubleCheckedLock