Struct holochain::prelude::kitsune_p2p::dependencies::kitsune_p2p_types::dependencies::lair_keystore_api::dependencies::parking_lot::lock_api::MappedRwLockWriteGuard
pub struct MappedRwLockWriteGuard<'a, R, T>{ /* private fields */ }
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>
impl<'a, R, T> MappedRwLockWriteGuard<'a, R, T>
pub fn map<U, F>(
s: MappedRwLockWriteGuard<'a, R, T>,
f: F
) -> MappedRwLockWriteGuard<'a, R, U>
pub fn map<U, F>( s: MappedRwLockWriteGuard<'a, R, T>, f: F ) -> MappedRwLockWriteGuard<'a, R, U>
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>>
pub fn try_map<U, F>( s: MappedRwLockWriteGuard<'a, R, T>, f: F ) -> Result<MappedRwLockWriteGuard<'a, R, U>, MappedRwLockWriteGuard<'a, R, T>>
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::try_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: RawRwLockFair + 'a,
T: 'a + ?Sized,
impl<'a, R, T> MappedRwLockWriteGuard<'a, R, T>where
R: RawRwLockFair + 'a,
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>
impl<'a, R, T> Debug for MappedRwLockWriteGuard<'a, R, T>
§impl<'a, R, T> Deref for MappedRwLockWriteGuard<'a, R, T>
impl<'a, R, T> Deref for MappedRwLockWriteGuard<'a, R, T>
§impl<'a, R, T> DerefMut for MappedRwLockWriteGuard<'a, R, T>
impl<'a, R, T> DerefMut for MappedRwLockWriteGuard<'a, R, T>
§impl<'a, R, T> Display for MappedRwLockWriteGuard<'a, R, T>
impl<'a, R, T> Display for MappedRwLockWriteGuard<'a, R, T>
§impl<'a, R, T> Drop for MappedRwLockWriteGuard<'a, R, T>
impl<'a, R, T> Drop for MappedRwLockWriteGuard<'a, R, T>
impl<'a, R, T> Send for MappedRwLockWriteGuard<'a, R, T>
impl<'a, R, T> Sync for MappedRwLockWriteGuard<'a, R, T>
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§
§impl<T> AnySync for T
impl<T> AnySync for T
§impl<T> ArchivePointee for T
impl<T> ArchivePointee for T
§type ArchivedMetadata = ()
type ArchivedMetadata = ()
§fn pointer_metadata(
_: &<T as ArchivePointee>::ArchivedMetadata
) -> <T as Pointee>::Metadata
fn pointer_metadata( _: &<T as ArchivePointee>::ArchivedMetadata ) -> <T as Pointee>::Metadata
source§impl<P> AsEngineRef for P
impl<P> AsEngineRef for P
source§fn as_engine_ref(&self) -> EngineRef<'_>
fn as_engine_ref(&self) -> EngineRef<'_>
EngineRef
pointing to the underlying context.source§impl<P> AsStoreMut for P
impl<P> AsStoreMut for P
source§fn as_store_mut(&mut self) -> StoreMut<'_>
fn as_store_mut(&mut self) -> StoreMut<'_>
StoreMut
pointing to the underlying context.source§fn objects_mut(&mut self) -> &mut StoreObjects
fn objects_mut(&mut self) -> &mut StoreObjects
source§impl<P> AsStoreRef for P
impl<P> AsStoreRef for P
source§fn as_store_ref(&self) -> StoreRef<'_>
fn as_store_ref(&self) -> StoreRef<'_>
StoreRef
pointing to the underlying context.source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
§impl<F, W, T, D> Deserialize<With<T, W>, D> for F
impl<F, W, T, D> Deserialize<With<T, W>, D> for F
§fn deserialize(
&self,
deserializer: &mut D
) -> Result<With<T, W>, <D as Fallible>::Error>
fn deserialize( &self, deserializer: &mut D ) -> Result<With<T, W>, <D as Fallible>::Error>
source§impl<T> FutureExt for T
impl<T> FutureExt for T
source§fn with_context(self, otel_cx: Context) -> WithContext<Self> ⓘ
fn with_context(self, otel_cx: Context) -> WithContext<Self> ⓘ
source§fn with_current_context(self) -> WithContext<Self> ⓘ
fn with_current_context(self) -> WithContext<Self> ⓘ
source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
source§fn in_current_span(self) -> Instrumented<Self> ⓘ
fn in_current_span(self) -> Instrumented<Self> ⓘ
source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
source§fn in_current_span(self) -> Instrumented<Self> ⓘ
fn in_current_span(self) -> Instrumented<Self> ⓘ
§impl<T> LayoutRaw for T
impl<T> LayoutRaw for T
§fn layout_raw(_: <T as Pointee>::Metadata) -> Result<Layout, LayoutError>
fn layout_raw(_: <T as Pointee>::Metadata) -> Result<Layout, LayoutError>
§impl<T> Pointable for T
impl<T> Pointable for T
§impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
§fn to_subset(&self) -> Option<SS>
fn to_subset(&self) -> Option<SS>
self
from the equivalent element of its
superset. Read more§fn is_in_subset(&self) -> bool
fn is_in_subset(&self) -> bool
self
is actually part of its subset T
(and can be converted to it).§fn to_subset_unchecked(&self) -> SS
fn to_subset_unchecked(&self) -> SS
self.to_subset
but without any property checks. Always succeeds.§fn from_subset(element: &SS) -> SP
fn from_subset(element: &SS) -> SP
self
to the equivalent element of its superset.