zng_app_context

Struct ReadOnlyRwLock

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pub struct ReadOnlyRwLock<T>(/* private fields */);
Expand description

Read-only wrapper on an Arc<RwLock<T>> contextual value.

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impl<T> ReadOnlyRwLock<T>

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pub fn new(l: Arc<RwLock<T>>) -> Self

New.

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pub fn read(&self) -> RwLockReadGuard<'_, T>

Locks this RwLock with shared read access, blocking the current thread until it can be acquired.

See parking_lot::RwLock::read for more details.

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pub fn read_recursive(&self) -> RwLockReadGuard<'_, T>

Locks this RwLock with shared read access, blocking the current thread until it can be acquired.

Unlike read, this method is guaranteed to succeed without blocking if another read lock is held at the time of the call.

See parking_lot::RwLock::read_recursive for more details.

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pub fn try_read(&self) -> Option<RwLockReadGuard<'_, T>>

Attempts to acquire this RwLock with shared read access.

See parking_lot::RwLock::try_read for more details.

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pub fn try_read_recursive(&self) -> Option<RwLockReadGuard<'_, T>>

Attempts to acquire this RwLock with shared read access.

See parking_lot::RwLock::try_read_recursive for more details.

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pub fn ptr_eq(&self, other: &Self) -> bool

Gets if the read-only shared reference is to the same lock as other.

Trait Implementations§

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impl<T> Clone for ReadOnlyRwLock<T>

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fn clone(&self) -> Self

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

Auto Trait Implementations§

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impl<T> Freeze for ReadOnlyRwLock<T>

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impl<T> !RefUnwindSafe for ReadOnlyRwLock<T>

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impl<T> Send for ReadOnlyRwLock<T>
where T: Send + Sync,

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impl<T> Sync for ReadOnlyRwLock<T>
where T: Send + Sync,

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impl<T> Unpin for ReadOnlyRwLock<T>

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impl<T> !UnwindSafe for ReadOnlyRwLock<T>

Blanket 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 T)

🔬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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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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.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more