Struct async_lock::RwLockWriteGuard
source · [−]pub struct RwLockWriteGuard<'a, T: ?Sized> { /* private fields */ }
Expand description
A guard that releases the write lock when dropped.
Implementations
sourceimpl<'a, T: ?Sized> RwLockWriteGuard<'a, T>
impl<'a, T: ?Sized> RwLockWriteGuard<'a, T>
sourcepub fn downgrade(guard: Self) -> RwLockReadGuard<'a, T>
pub fn downgrade(guard: Self) -> 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());
sourcepub fn downgrade_to_upgradable(guard: Self) -> RwLockUpgradableReadGuard<'a, T>
pub fn downgrade_to_upgradable(guard: Self) -> 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
sourceimpl<T: Debug + ?Sized> Debug for RwLockWriteGuard<'_, T>
impl<T: Debug + ?Sized> Debug for RwLockWriteGuard<'_, T>
sourceimpl<T: ?Sized> Deref for RwLockWriteGuard<'_, T>
impl<T: ?Sized> Deref for RwLockWriteGuard<'_, T>
sourceimpl<T: ?Sized> DerefMut for RwLockWriteGuard<'_, T>
impl<T: ?Sized> DerefMut for RwLockWriteGuard<'_, T>
sourceimpl<T: Display + ?Sized> Display for RwLockWriteGuard<'_, T>
impl<T: Display + ?Sized> Display for RwLockWriteGuard<'_, T>
impl<T: Send + ?Sized> Send for RwLockWriteGuard<'_, T>
impl<T: Sync + ?Sized> Sync for RwLockWriteGuard<'_, T>
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