mirror of
https://github.com/denoland/deno.git
synced 2024-12-22 07:14:47 -05:00
36 lines
831 B
Rust
36 lines
831 B
Rust
|
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
|
||
|
|
|
||
|
|
use std::sync::atomic::AtomicBool;
|
||
|
|
use std::sync::atomic::Ordering;
|
||
|
|
|
||
|
|
/// Simplifies the use of an atomic boolean as a flag.
|
||
|
|
#[derive(Debug, Default)]
|
||
|
|
pub struct AtomicFlag(AtomicBool);
|
||
|
|
|
||
|
|
impl AtomicFlag {
|
||
|
|
/// Raises the flag returning if the raise was successful.
|
||
|
|
pub fn raise(&self) -> bool {
|
||
|
|
!self.0.swap(true, Ordering::SeqCst)
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Gets if the flag is raised.
|
||
|
|
pub fn is_raised(&self) -> bool {
|
||
|
|
self.0.load(Ordering::SeqCst)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#[cfg(test)]
|
||
|
|
mod test {
|
||
|
|
use super::AtomicFlag;
|
||
|
|
|
||
|
|
#[test]
|
||
|
|
fn atomic_flag_raises() {
|
||
|
|
let flag = AtomicFlag::default();
|
||
|
|
assert!(!flag.is_raised()); // false by default
|
||
|
|
assert!(flag.raise());
|
||
|
|
assert!(flag.is_raised());
|
||
|
|
assert!(!flag.raise());
|
||
|
|
assert!(flag.is_raised());
|
||
|
|
}
|
||
|
|
}
|