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