ostd::sync::rcu

Struct RcuReadGuard

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pub struct RcuReadGuard<'a, P: NonNullPtr>(RcuReadGuardInner<'a, P>);
Expand description

A guard that allows access to the pointed data protected by a Rcu.

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§0: RcuReadGuardInner<'a, P>

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impl<P: NonNullPtr + Send> RcuReadGuard<'_, P>

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pub fn get(&self) -> P::Ref<'_>

Gets the reference of the protected data.

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pub fn compare_exchange(self, new_ptr: P) -> Result<(), P>

Tries to replace the already read pointer with a new pointer.

If another thread has updated the pointer after the read, this function will fail, and returns the given pointer back. Otherwise, it will replace the pointer with the new one and drop the old pointer after the grace period.

If spinning on Rcu::read and this function, it is recommended to relax the CPU or yield the task on failure. Otherwise contention will occur.

This API does not help to avoid the ABA problem.

Auto Trait Implementations§

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impl<'a, P> Freeze for RcuReadGuard<'a, P>

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impl<'a, P> RefUnwindSafe for RcuReadGuard<'a, P>
where <P as NonNullPtr>::Target: RefUnwindSafe,

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impl<'a, P> !Send for RcuReadGuard<'a, P>

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impl<'a, P> !Sync for RcuReadGuard<'a, P>

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impl<'a, P> Unpin for RcuReadGuard<'a, P>

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impl<'a, P> UnwindSafe for RcuReadGuard<'a, P>
where <P as NonNullPtr>::Target: RefUnwindSafe,

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

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fn type_id(&self) -> TypeId

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impl<T> Borrow<T> for T
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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
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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> Conv for T

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fn conv<T>(self) -> T
where Self: Into<T>,

Converts self into T using Into<T>. Read more
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fn fmt_binary(self) -> FmtBinary<Self>
where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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fn fmt_display(self) -> FmtDisplay<Self>
where Self: Display,

Causes self to use its Display implementation when Debug-formatted.
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fn fmt_lower_exp(self) -> FmtLowerExp<Self>
where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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fn fmt_lower_hex(self) -> FmtLowerHex<Self>
where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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fn fmt_octal(self) -> FmtOctal<Self>
where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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fn fmt_pointer(self) -> FmtPointer<Self>
where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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fn fmt_upper_exp(self) -> FmtUpperExp<Self>
where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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fn fmt_upper_hex(self) -> FmtUpperHex<Self>
where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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fn from(t: T) -> T

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fn into(self) -> U

Calls U::from(self).

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fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> R
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Pipes by value. This is generally the method you want to use. Read more
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fn pipe_ref<'a, R>(&'a self, func: impl FnOnce(&'a Self) -> R) -> R
where R: 'a,

Borrows self and passes that borrow into the pipe function. Read more
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where R: 'a,

Mutably borrows self and passes that borrow into the pipe function. Read more
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fn pipe_borrow<'a, B, R>(&'a self, func: impl FnOnce(&'a B) -> R) -> R
where Self: Borrow<B>, B: 'a + ?Sized, R: 'a,

Borrows self, then passes self.borrow() into the pipe function. Read more
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Mutably borrows self, then passes self.borrow_mut() into the pipe function. Read more
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where Self: AsRef<U>, U: 'a + ?Sized, R: 'a,

Borrows self, then passes self.as_ref() into the pipe function.
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where Self: AsMut<U>, U: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.as_mut() into the pipe function.
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where Self: Deref<Target = T>, T: 'a + ?Sized, R: 'a,

Borrows self, then passes self.deref() into the pipe function.
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where Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.deref_mut() into the pipe function.
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type Metadata = ()

The metadata type for pointers and references to this type.
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fn tap(self, func: impl FnOnce(&Self)) -> Self

Immutable access to a value. Read more
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fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self

Mutable access to a value. Read more
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fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Self
where Self: Borrow<B>, B: ?Sized,

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Mutable access to the BorrowMut<B> of a value. Read more
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fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Self
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fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
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fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
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fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Calls .tap_deref_mut() only in debug builds, and is erased in release builds.
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