pub struct RcuOptionReadGuard<'a, P: NonNullPtr>(/* private fields */);Expand description
A guard that allows access to the pointed data protected by a RcuOption.
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Source§impl<P: NonNullPtr + Send> RcuOptionReadGuard<'_, P>
impl<P: NonNullPtr + Send> RcuOptionReadGuard<'_, P>
Sourcepub fn get(&self) -> Option<P::Ref<'_>>
pub fn get(&self) -> Option<P::Ref<'_>>
Gets the reference of the protected data.
If the RCU primitive protects nothing, this function returns None.
Sourcepub fn is_none(&self) -> bool
pub fn is_none(&self) -> bool
Returns if the RCU primitive protects nothing when Rcu::read happens.
Sourcepub fn compare_exchange(self, new_ptr: Option<P>) -> Result<(), Option<P>>
pub fn compare_exchange(self, new_ptr: Option<P>) -> Result<(), Option<P>>
Tries to replace the already read pointer with a new pointer (or none).
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 RcuOption::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§
impl<'a, P> Freeze for RcuOptionReadGuard<'a, P>
impl<'a, P> RefUnwindSafe for RcuOptionReadGuard<'a, P>where
<P as NonNullPtr>::Target: RefUnwindSafe,
impl<'a, P> !Send for RcuOptionReadGuard<'a, P>
impl<'a, P> !Sync for RcuOptionReadGuard<'a, P>
impl<'a, P> Unpin for RcuOptionReadGuard<'a, P>
impl<'a, P> UnwindSafe for RcuOptionReadGuard<'a, P>where
<P as NonNullPtr>::Target: RefUnwindSafe,
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