lock_api

Struct ArcRwLockUpgradableReadGuard

Source
pub struct ArcRwLockUpgradableReadGuard<R: RawRwLockUpgrade, T: ?Sized> { /* private fields */ }
Available on crate feature arc_lock only.
Expand description

An RAII rwlock guard returned by the Arc locking operations on RwLock. This is similar to the RwLockUpgradableReadGuard struct, except instead of using a reference to unlock the RwLock it uses an Arc<RwLock>. This has several advantages, most notably that it has an 'static lifetime.

Implementations§

Source§

impl<R: RawRwLockUpgrade, T: ?Sized> ArcRwLockUpgradableReadGuard<R, T>

Source

pub fn rwlock(s: &Self) -> &Arc<RwLock<R, T>>

Returns a reference to the rwlock, contained in its original Arc.

Source

pub fn unlocked<F, U>(s: &mut Self, f: F) -> U
where F: FnOnce() -> U,

Temporarily unlocks the RwLock to execute the given function.

This is functionally identical to the unlocked method on RwLockUpgradableReadGuard.

Source

pub fn upgrade(s: Self) -> ArcRwLockWriteGuard<R, T>

Atomically upgrades an upgradable read lock lock into an exclusive write lock, blocking the current thread until it can be acquired.

Source

pub fn try_upgrade(s: Self) -> Result<ArcRwLockWriteGuard<R, T>, Self>

Tries to atomically upgrade an upgradable read lock into an exclusive write lock.

If the access could not be granted at this time, then the current guard is returned.

Source§

impl<R: RawRwLockUpgradeFair, T: ?Sized> ArcRwLockUpgradableReadGuard<R, T>

Source

pub fn unlock_fair(s: Self)

Unlocks the RwLock using a fair unlock protocol.

This is functionally identical to the unlock_fair method on RwLockUpgradableReadGuard.

Source

pub fn unlocked_fair<F, U>(s: &mut Self, f: F) -> U
where F: FnOnce() -> U,

Temporarily unlocks the RwLock to execute the given function.

This is functionally equivalent to the unlocked_fair method on RwLockUpgradableReadGuard.

Source

pub fn bump(s: &mut Self)

Temporarily yields the RwLock to a waiting thread if there is one.

This method is functionally equivalent to calling bump on RwLockUpgradableReadGuard.

Source§

impl<R: RawRwLockUpgradeDowngrade, T: ?Sized> ArcRwLockUpgradableReadGuard<R, T>

Source

pub fn downgrade(s: Self) -> ArcRwLockReadGuard<R, T>

Atomically downgrades an upgradable read lock lock into a shared read lock without allowing any writers to take exclusive access of the lock in the meantime.

Note that if there are any writers currently waiting to take the lock then other readers may not be able to acquire the lock even if it was downgraded.

Source

pub fn with_upgraded<Ret, F: FnOnce(&mut T) -> Ret>(&mut self, f: F) -> Ret

First, atomically upgrades an upgradable read lock lock into an exclusive write lock, blocking the current thread until it can be acquired.

Then, calls the provided closure with an exclusive reference to the lock’s data.

Finally, atomically downgrades the lock back to an upgradable read lock. The closure’s return value is returned.

This function only requires a mutable reference to the guard, unlike upgrade which takes the guard by value.

Source

pub fn try_with_upgraded<Ret, F: FnOnce(&mut T) -> Ret>( &mut self, f: F, ) -> Option<Ret>

First, tries to atomically upgrade an upgradable read lock into an exclusive write lock.

If the access could not be granted at this time, then None is returned.

Otherwise, calls the provided closure with an exclusive reference to the lock’s data, and finally downgrades the lock back to an upgradable read lock. The closure’s return value is wrapped in Some and returned.

This function only requires a mutable reference to the guard, unlike try_upgrade which takes the guard by value.

Source§

impl<R: RawRwLockUpgradeTimed, T: ?Sized> ArcRwLockUpgradableReadGuard<R, T>

Source

pub fn try_upgrade_for( s: Self, timeout: R::Duration, ) -> Result<ArcRwLockWriteGuard<R, T>, Self>

Tries to atomically upgrade an upgradable read lock into an exclusive write lock, until a timeout is reached.

If the access could not be granted before the timeout expires, then the current guard is returned.

Source

pub fn try_upgrade_until( s: Self, timeout: R::Instant, ) -> Result<ArcRwLockWriteGuard<R, T>, Self>

Tries to atomically upgrade an upgradable read lock into an exclusive write lock, until a timeout is reached.

If the access could not be granted before the timeout expires, then the current guard is returned.

Source§

impl<R: RawRwLockUpgradeTimed + RawRwLockUpgradeDowngrade, T: ?Sized> ArcRwLockUpgradableReadGuard<R, T>

Source

pub fn try_with_upgraded_for<Ret, F: FnOnce(&mut T) -> Ret>( &mut self, timeout: R::Duration, f: F, ) -> Option<Ret>

Tries to atomically upgrade an upgradable read lock into an exclusive write lock, until a timeout is reached.

If the access could not be granted before the timeout expires, then None is returned.

Otherwise, calls the provided closure with an exclusive reference to the lock’s data, and finally downgrades the lock back to an upgradable read lock. The closure’s return value is wrapped in Some and returned.

This function only requires a mutable reference to the guard, unlike try_upgrade_for which takes the guard by value.

Source

pub fn try_with_upgraded_until<Ret, F: FnOnce(&mut T) -> Ret>( &mut self, timeout: R::Instant, f: F, ) -> Option<Ret>

Tries to atomically upgrade an upgradable read lock into an exclusive write lock, until a timeout is reached.

If the access could not be granted before the timeout expires, then None is returned.

Otherwise, calls the provided closure with an exclusive reference to the lock’s data, and finally downgrades the lock back to an upgradable read lock. The closure’s return value is wrapped in Some and returned.

This function only requires a mutable reference to the guard, unlike try_upgrade_until which takes the guard by value.

Trait Implementations§

Source§

impl<R: RawRwLockUpgrade, T: Debug + ?Sized> Debug for ArcRwLockUpgradableReadGuard<R, T>

Source§

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

Formats the value using the given formatter. Read more
Source§

impl<R: RawRwLockUpgrade, T: ?Sized> Deref for ArcRwLockUpgradableReadGuard<R, T>

Source§

type Target = T

The resulting type after dereferencing.
Source§

fn deref(&self) -> &T

Dereferences the value.
Source§

impl<R: RawRwLockUpgrade, T: Display + ?Sized> Display for ArcRwLockUpgradableReadGuard<R, T>

Source§

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

Formats the value using the given formatter. Read more
Source§

impl<R: RawRwLockUpgrade, T: ?Sized> Drop for ArcRwLockUpgradableReadGuard<R, T>

Source§

fn drop(&mut self)

Executes the destructor for this type. Read more

Auto Trait Implementations§

§

impl<R, T> Freeze for ArcRwLockUpgradableReadGuard<R, T>
where T: ?Sized,

§

impl<R, T> !RefUnwindSafe for ArcRwLockUpgradableReadGuard<R, T>

§

impl<R, T> Send for ArcRwLockUpgradableReadGuard<R, T>
where <R as RawRwLock>::GuardMarker: Send, R: Sync + Send, T: Send + Sync + ?Sized,

§

impl<R, T> Sync for ArcRwLockUpgradableReadGuard<R, T>
where <R as RawRwLock>::GuardMarker: Sync, R: Sync + Send, T: Send + Sync + ?Sized,

§

impl<R, T> Unpin for ArcRwLockUpgradableReadGuard<R, T>
where <R as RawRwLock>::GuardMarker: Unpin, T: ?Sized,

§

impl<R, T> !UnwindSafe for ArcRwLockUpgradableReadGuard<R, T>

Blanket Implementations§

Source§

impl<T> Any for T
where T: 'static + ?Sized,

Source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
Source§

impl<T> Borrow<T> for T
where T: ?Sized,

Source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

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

Mutably borrows from an owned value. Read more
Source§

impl<T> From<T> for T

Source§

fn from(t: T) -> T

Returns the argument unchanged.

Source§

impl<T, U> Into<U> for T
where U: From<T>,

Source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Source§

impl<P, T> Receiver for P
where P: Deref<Target = T> + ?Sized, T: ?Sized,

Source§

type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)
Available on non-bootstrap only.
The target type on which the method may be called.
Source§

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

Source§

default fn to_string(&self) -> String

Converts the given value to a String. Read more
Source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

Source§

type Error = Infallible

The type returned in the event of a conversion error.
Source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
Source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.