pub struct RwLockWriteGuardArc<T: ?Sized> { /* private fields */ }
Expand description

An owned, reference-counted guard that releases the write lock when dropped.

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impl<T> RwLockWriteGuardArc<T>

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pub fn downgrade(guard: Self) -> RwLockReadGuardArc<T>

Downgrades into a regular reader guard.

Examples
use std::sync::Arc;
use async_lock::{RwLock, RwLockWriteGuardArc};

let lock = Arc::new(RwLock::new(1));

let mut writer = lock.write_arc().await;
*writer += 1;

assert!(lock.try_read_arc().is_none());

let reader = RwLockWriteGuardArc::downgrade(writer);
assert_eq!(*reader, 2);

assert!(lock.try_read_arc().is_some());
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impl<T: ?Sized> RwLockWriteGuardArc<T>

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pub fn downgrade_to_upgradable(guard: Self) -> RwLockUpgradableReadGuardArc<T>

Downgrades into an upgradable reader guard.

Examples
use std::sync::Arc;
use async_lock::{RwLock, RwLockUpgradableReadGuardArc, RwLockWriteGuardArc};

let lock = Arc::new(RwLock::new(1));

let mut writer = lock.write_arc().await;
*writer += 1;

assert!(lock.try_read_arc().is_none());

let reader = RwLockWriteGuardArc::downgrade_to_upgradable(writer);
assert_eq!(*reader, 2);

assert!(lock.try_write_arc().is_none());
assert!(lock.try_read_arc().is_some());

assert!(RwLockUpgradableReadGuardArc::try_upgrade(reader).is_ok())

Trait Implementations§

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impl<T: Debug + ?Sized> Debug for RwLockWriteGuardArc<T>

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

Formats the value using the given formatter. Read more
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impl<T: ?Sized> Deref for RwLockWriteGuardArc<T>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &T

Dereferences the value.
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impl<T: ?Sized> DerefMut for RwLockWriteGuardArc<T>

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

Mutably dereferences the value.
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impl<T: Display + ?Sized> Display for RwLockWriteGuardArc<T>

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

Formats the value using the given formatter. Read more
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impl<T: ?Sized> Drop for RwLockWriteGuardArc<T>

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl<T: Send + Sync + ?Sized> Send for RwLockWriteGuardArc<T>

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impl<T: Send + Sync + ?Sized> Sync for RwLockWriteGuardArc<T>

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere 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 Twhere 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 Twhere 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> ToString for Twhere T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for Twhere 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 Twhere 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.