pub struct RwLockWriteGuard<'a, T> where
T: ?Sized, { /* private fields */ }
Expand description
A guard that releases the write lock when dropped.
Implementations
impl<'a, T> RwLockWriteGuard<'a, T> where
T: ?Sized,
impl<'a, T> RwLockWriteGuard<'a, T> where
T: ?Sized,
pub fn downgrade(guard: RwLockWriteGuard<'a, T>) -> RwLockReadGuard<'a, T>
pub fn downgrade(guard: RwLockWriteGuard<'a, T>) -> RwLockReadGuard<'a, T>
Downgrades into a regular reader guard.
Examples
use async_lock::{RwLock, RwLockWriteGuard};
let lock = RwLock::new(1);
let mut writer = lock.write().await;
*writer += 1;
assert!(lock.try_read().is_none());
let reader = RwLockWriteGuard::downgrade(writer);
assert_eq!(*reader, 2);
assert!(lock.try_read().is_some());
pub fn downgrade_to_upgradable(
guard: RwLockWriteGuard<'a, T>
) -> RwLockUpgradableReadGuard<'a, T>
pub fn downgrade_to_upgradable(
guard: RwLockWriteGuard<'a, T>
) -> RwLockUpgradableReadGuard<'a, T>
Downgrades into an upgradable reader guard.
Examples
use async_lock::{RwLock, RwLockUpgradableReadGuard, RwLockWriteGuard};
let lock = RwLock::new(1);
let mut writer = lock.write().await;
*writer += 1;
assert!(lock.try_read().is_none());
let reader = RwLockWriteGuard::downgrade_to_upgradable(writer);
assert_eq!(*reader, 2);
assert!(lock.try_write().is_none());
assert!(lock.try_read().is_some());
assert!(RwLockUpgradableReadGuard::try_upgrade(reader).is_ok())
Trait Implementations
impl<'_, T> Debug for RwLockWriteGuard<'_, T> where
T: Debug + ?Sized,
impl<'_, T> Debug for RwLockWriteGuard<'_, T> where
T: Debug + ?Sized,
impl<'_, T> Deref for RwLockWriteGuard<'_, T> where
T: ?Sized,
impl<'_, T> Deref for RwLockWriteGuard<'_, T> where
T: ?Sized,
impl<'_, T> DerefMut for RwLockWriteGuard<'_, T> where
T: ?Sized,
impl<'_, T> DerefMut for RwLockWriteGuard<'_, T> where
T: ?Sized,
impl<'_, T> Display for RwLockWriteGuard<'_, T> where
T: Display + ?Sized,
impl<'_, T> Display for RwLockWriteGuard<'_, T> where
T: Display + ?Sized,
impl<'_, T> Send for RwLockWriteGuard<'_, T> where
T: Send + ?Sized,
impl<'_, T> Sync for RwLockWriteGuard<'_, T> where
T: Sync + ?Sized,
Auto Trait Implementations
impl<'a, T> !RefUnwindSafe for RwLockWriteGuard<'a, T>
impl<'a, T: ?Sized> Unpin for RwLockWriteGuard<'a, T>
impl<'a, T> !UnwindSafe for RwLockWriteGuard<'a, T>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
sourcefn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
fn vzip(self) -> V
sourceimpl<T> WithSubscriber for T
impl<T> WithSubscriber for T
sourcefn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
T: Future, type Output = <T as Future>::Output;
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
sourcefn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
fn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more