[−]Struct smol::lock::Semaphore
A counter for limiting the number of concurrent operations.
Implementations
impl Semaphore
pub fn new(n: usize) -> Semaphore
Creates a new semaphore with a limit of n
concurrent operations.
Examples
use async_semaphore::Semaphore; let s = Semaphore::new(5);
pub fn try_acquire(&self) -> Option<SemaphoreGuard<'_>>
Attempts to get the permit for a concurrent operation.
Examples
use async_semaphore::Semaphore; let s = Semaphore::new(2); let g1 = s.try_acquire().unwrap(); let g2 = s.try_acquire().unwrap(); assert!(s.try_acquire().is_none()); drop(g2); assert!(s.try_acquire().is_some());
pub async fn acquire(&'_ self) -> SemaphoreGuard<'_>
Waits for the permit for a concurrent operation.
Examples
use async_semaphore::Semaphore; let s = Semaphore::new(2); let guard = s.acquire().await;
Trait Implementations
Auto Trait Implementations
impl RefUnwindSafe for Semaphore
impl Send for Semaphore
impl Sync for Semaphore
impl Unpin for Semaphore
impl UnwindSafe for Semaphore
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut Tⓘ
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,