maitake::sync::util

Struct Backoff

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pub struct Backoff { /* private fields */ }
Expand description

An exponential backoff for spin loops.

This is a helper struct for spinning in a busy loop, with an exponentially increasing number of spins up to a maximum value.

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impl Backoff

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pub const DEFAULT_MAX_EXPONENT: u8 = 8u8

The default maximum exponent (2^8).

This is the maximum exponent returned by Backoff::new() and Backoff::default(). To override the maximum exponent, use Backoff::with_max_exponent().

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pub const fn new() -> Backoff

Returns a new exponential backoff with the maximum exponent set to Self::DEFAULT_MAX_EXPONENT.

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pub fn with_max_exponent(max: u8) -> Backoff

Returns a new exponential backoff with the provided max exponent.

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pub fn spin(&mut self)

Backs off in a spin loop.

This should be used when an operation needs to be retried because another thread or core made progress. Depending on the target architecture, this will generally issue a sequence of yield or pause instructions.

Each time this function is called, it will issue 2^exp [spin loop hints], where exp is the current exponent value (starting at 0). If exp is less than the configured maximum exponent, the exponent is incremented once the spin is complete.

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impl Clone for Backoff

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fn clone(&self) -> Backoff

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Backoff

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

Formats the value using the given formatter. Read more
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impl Default for Backoff

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fn default() -> Backoff

Returns the “default value” for a type. Read more
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impl Copy for Backoff

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.