Struct smol::lock::RwLockWriteGuardArc

pub struct RwLockWriteGuardArc<T>
where
    T: ?Sized,
{ /* private fields */ }

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

Implementations

impl<T> RwLockWriteGuardArc<T>

pub fn downgrade(guard: RwLockWriteGuardArc<T>) -> 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());

impl<T> RwLockWriteGuardArc<T>

where T: ?Sized,

pub fn downgrade_to_upgradable( guard: RwLockWriteGuardArc<T> ) -> 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

impl<T> Debug for RwLockWriteGuardArc<T>

where T: Debug + ?Sized,

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

Formats the value using the given formatter.

impl<T> Deref for RwLockWriteGuardArc<T>

where T: ?Sized,

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> DerefMut for RwLockWriteGuardArc<T>

where T: ?Sized,

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

Mutably dereferences the value.

impl<T> Display for RwLockWriteGuardArc<T>

where T: Display + ?Sized,

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

Formats the value using the given formatter.

impl<T> Drop for RwLockWriteGuardArc<T>

where T: ?Sized,

fn drop(&mut self)

Executes the destructor for this type.

impl<T> Send for RwLockWriteGuardArc<T>

where T: Send + Sync + ?Sized,

impl<T> Sync for RwLockWriteGuardArc<T>

where T: Send + Sync + ?Sized,