## CoreLatch

# Struct CoreLatch

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    pub(crate) struct CoreLatch {
        state: AtomicUsize,
    }

Expand description

Spin latches are the simplest, most efficient kind, but they do not support a `wait()` operation. They just have a boolean flag that becomes true when `set()` is called.

## Fields§

§`state: AtomicUsize`

## Implementations§

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### impl CoreLatch

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#### fn new() -> Self

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#### pub(crate) fn get_sleepy(&self) -> bool

Invoked by owning thread as it prepares to sleep. Returns true if the owning thread may proceed to fall asleep, false if the latch was set in the meantime.

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#### pub(crate) fn fall_asleep(&self) -> bool

Invoked by owning thread as it falls asleep sleep. Returns true if the owning thread should block, or false if the latch was set in the meantime.

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#### pub(crate) fn wake_up(&self)

Invoked by owning thread as it falls asleep sleep. Returns true if the owning thread should block, or false if the latch was set in the meantime.

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#### unsafe fn set(this: *const Self) -> bool

Set the latch. If this returns true, the owning thread was sleeping and must be awoken.

This is private because, typically, setting a latch involves doing some wakeups; those are encapsulated in the surrounding latch code.

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#### pub(crate) fn probe(&self) -> bool

Test if this latch has been set.

## Trait Implementations§

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### impl AsCoreLatch for CoreLatch

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#### fn as_core_latch(&self) -> &CoreLatch

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### impl Debug for CoreLatch

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

Formats the value using the given formatter. Read more

## Auto Trait Implementations§

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### impl !Freeze for CoreLatch

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### impl RefUnwindSafe for CoreLatch

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### impl Send for CoreLatch

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### impl Sync for CoreLatch

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### impl Unpin for CoreLatch

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### impl UnwindSafe for CoreLatch

## 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> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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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> 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, 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.

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes