Struct otter::prelude::parking_lot::lock_api::MappedRwLockWriteGuard
[−]Expand description
An RAII write lock guard returned by RwLockWriteGuard::map
, which can point to a
subfield of the protected data.
The main difference between MappedRwLockWriteGuard
and RwLockWriteGuard
is that the
former doesn’t support temporarily unlocking and re-locking, since that
could introduce soundness issues if the locked object is modified by another
thread.
Implementations
impl<'a, R, T> MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + ?Sized,
impl<'a, R, T> MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + ?Sized,
pub fn map<U, F>(
s: MappedRwLockWriteGuard<'a, R, T>,
f: F
) -> MappedRwLockWriteGuard<'a, R, U> where
F: for<'_> FnOnce(&mut T) -> &mut U,
U: ?Sized,
pub fn map<U, F>(
s: MappedRwLockWriteGuard<'a, R, T>,
f: F
) -> MappedRwLockWriteGuard<'a, R, U> where
F: for<'_> FnOnce(&mut T) -> &mut U,
U: ?Sized,
Make a new MappedRwLockWriteGuard
for a component of the locked data.
This operation cannot fail as the MappedRwLockWriteGuard
passed
in already locked the data.
This is an associated function that needs to be
used as MappedRwLockWriteGuard::map(...)
. A method would interfere with methods of
the same name on the contents of the locked data.
pub fn try_map<U, F>(
s: MappedRwLockWriteGuard<'a, R, T>,
f: F
) -> Result<MappedRwLockWriteGuard<'a, R, U>, MappedRwLockWriteGuard<'a, R, T>> where
F: for<'_> FnOnce(&mut T) -> Option<&mut U>,
U: ?Sized,
pub fn try_map<U, F>(
s: MappedRwLockWriteGuard<'a, R, T>,
f: F
) -> Result<MappedRwLockWriteGuard<'a, R, U>, MappedRwLockWriteGuard<'a, R, T>> where
F: for<'_> FnOnce(&mut T) -> Option<&mut U>,
U: ?Sized,
Attempts to make a new MappedRwLockWriteGuard
for a component of the
locked data. The original guard is return if the closure returns None
.
This operation cannot fail as the MappedRwLockWriteGuard
passed
in already locked the data.
This is an associated function that needs to be
used as MappedRwLockWriteGuard::map(...)
. A method would interfere with methods of
the same name on the contents of the locked data.
impl<'a, R, T> MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLockFair,
T: 'a + ?Sized,
impl<'a, R, T> MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLockFair,
T: 'a + ?Sized,
pub fn unlock_fair(s: MappedRwLockWriteGuard<'a, R, T>)
pub fn unlock_fair(s: MappedRwLockWriteGuard<'a, R, T>)
Unlocks the RwLock
using a fair unlock protocol.
By default, RwLock
is unfair and allow the current thread to re-lock
the RwLock
before another has the chance to acquire the lock, even if
that thread has been blocked on the RwLock
for a long time. This is
the default because it allows much higher throughput as it avoids
forcing a context switch on every RwLock
unlock. This can result in one
thread acquiring a RwLock
many more times than other threads.
However in some cases it can be beneficial to ensure fairness by forcing
the lock to pass on to a waiting thread if there is one. This is done by
using this method instead of dropping the MappedRwLockWriteGuard
normally.
Trait Implementations
impl<'a, R, T> Debug for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Debug + ?Sized,
impl<'a, R, T> Debug for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Debug + ?Sized,
impl<'a, R, T> Deref for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + ?Sized,
impl<'a, R, T> Deref for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + ?Sized,
impl<'a, R, T> DerefMut for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + ?Sized,
impl<'a, R, T> DerefMut for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + ?Sized,
impl<'a, R, T> Display for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
impl<'a, R, T> Drop for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + ?Sized,
impl<'a, R, T> Drop for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + ?Sized,
impl<'a, R, T> Send for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Send + ?Sized,
<R as RawRwLock>::GuardMarker: Send,
impl<'a, R, T> Sync for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Sync + ?Sized,
Auto Trait Implementations
impl<'a, R, T: ?Sized> RefUnwindSafe for MappedRwLockWriteGuard<'a, R, T> where
R: RefUnwindSafe,
T: RefUnwindSafe,
impl<'a, R, T: ?Sized> Unpin for MappedRwLockWriteGuard<'a, R, T>
impl<'a, R, T> !UnwindSafe for MappedRwLockWriteGuard<'a, R, 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> Downcast for T where
T: Any,
impl<T> Downcast for T where
T: Any,
sourcefn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<W, Global>impl<W> Write for Box<W, Global> where
W: Write + ?Sized, impl<R> Read for Box<R, Global> where
R: Read + ?Sized, impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;
fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<W, Global>impl<W> Write for Box<W, Global> where
W: Write + ?Sized, impl<R> Read for Box<R, Global> where
R: Read + ?Sized, impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;
W: Write + ?Sized, impl<R> Read for Box<R, Global> where
R: Read + ?Sized, impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;
Convert Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
. Read more
sourcefn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
Convert Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
. Read more
sourcefn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
Convert &Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s. Read more
sourcefn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert &mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more
sourceimpl<T> DowncastSync for T where
T: Any + Send + Sync,
impl<T> DowncastSync for T where
T: Any + Send + Sync,
sourceimpl<A> DynCastExt for A
impl<A> DynCastExt for A
sourcefn dyn_cast<T>(
self
) -> Result<<A as DynCastExtHelper<T>>::Target, <A as DynCastExtHelper<T>>::Source> where
A: DynCastExtHelper<T>,
T: ?Sized,
fn dyn_cast<T>(
self
) -> Result<<A as DynCastExtHelper<T>>::Target, <A as DynCastExtHelper<T>>::Source> where
A: DynCastExtHelper<T>,
T: ?Sized,
Use this to cast from one trait object type to another. Read more
sourcefn dyn_upcast<T>(self) -> <A as DynCastExtAdvHelper<T, T>>::Target where
A: DynCastExtAdvHelper<T, T, Source = <A as DynCastExtAdvHelper<T, T>>::Target>,
T: ?Sized,
fn dyn_upcast<T>(self) -> <A as DynCastExtAdvHelper<T, T>>::Target where
A: DynCastExtAdvHelper<T, T, Source = <A as DynCastExtAdvHelper<T, T>>::Target>,
T: ?Sized,
Use this to upcast a trait to one of its supertraits. Read more
sourcefn dyn_cast_adv<F, T>(
self
) -> Result<<A as DynCastExtAdvHelper<F, T>>::Target, <A as DynCastExtAdvHelper<F, T>>::Source> where
A: DynCastExtAdvHelper<F, T>,
F: ?Sized,
T: ?Sized,
fn dyn_cast_adv<F, T>(
self
) -> Result<<A as DynCastExtAdvHelper<F, T>>::Target, <A as DynCastExtAdvHelper<F, T>>::Source> where
A: DynCastExtAdvHelper<F, T>,
F: ?Sized,
T: ?Sized,
sourcefn dyn_cast_with_config<C>(
self
) -> Result<<A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Target, <A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Source> where
C: DynCastConfig,
A: DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>,
fn dyn_cast_with_config<C>(
self
) -> Result<<A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Target, <A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Source> where
C: DynCastConfig,
A: DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>,
Use this to cast from one trait object type to another. With this method the type parameter is a config type that uniquely specifies which cast should be preformed. Read more