Struct holochain::prelude::dependencies::kitsune_p2p_types::dependencies::lair_keystore_api::dependencies::parking_lot::lock_api::RwLockReadGuard
Expand description
RAII structure used to release the shared read access of a lock when dropped.
Implementations§
§impl<'a, R, T> RwLockReadGuard<'a, R, T>where
R: RawRwLock + 'a,
T: 'a + ?Sized,
impl<'a, R, T> RwLockReadGuard<'a, R, T>where
R: RawRwLock + 'a,
T: 'a + ?Sized,
pub fn rwlock(s: &RwLockReadGuard<'a, R, T>) -> &'a RwLock<R, T>
pub fn rwlock(s: &RwLockReadGuard<'a, R, T>) -> &'a RwLock<R, T>
Returns a reference to the original reader-writer lock object.
pub fn map<U, F>(
s: RwLockReadGuard<'a, R, T>,
f: F
) -> MappedRwLockReadGuard<'a, R, U>where
F: FnOnce(&T) -> &U,
U: ?Sized,
pub fn map<U, F>(
s: RwLockReadGuard<'a, R, T>,
f: F
) -> MappedRwLockReadGuard<'a, R, U>where
F: FnOnce(&T) -> &U,
U: ?Sized,
Make a new MappedRwLockReadGuard
for a component of the locked data.
This operation cannot fail as the RwLockReadGuard
passed
in already locked the data.
This is an associated function that needs to be
used as RwLockReadGuard::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: RwLockReadGuard<'a, R, T>,
f: F
) -> Result<MappedRwLockReadGuard<'a, R, U>, RwLockReadGuard<'a, R, T>>where
F: FnOnce(&T) -> Option<&U>,
U: ?Sized,
pub fn try_map<U, F>(
s: RwLockReadGuard<'a, R, T>,
f: F
) -> Result<MappedRwLockReadGuard<'a, R, U>, RwLockReadGuard<'a, R, T>>where
F: FnOnce(&T) -> Option<&U>,
U: ?Sized,
Attempts to make a new MappedRwLockReadGuard
for a component of the
locked data. Returns the original guard if the closure returns None
.
This operation cannot fail as the RwLockReadGuard
passed
in already locked the data.
This is an associated function that needs to be
used as RwLockReadGuard::try_map(...)
. A method would interfere with methods of
the same name on the contents of the locked data.
pub fn unlocked<F, U>(s: &mut RwLockReadGuard<'a, R, T>, f: F) -> Uwhere
F: FnOnce() -> U,
pub fn unlocked<F, U>(s: &mut RwLockReadGuard<'a, R, T>, f: F) -> Uwhere
F: FnOnce() -> U,
Temporarily unlocks the RwLock
to execute the given function.
The RwLock
is unlocked a fair unlock protocol.
This is safe because &mut
guarantees that there exist no other
references to the data protected by the RwLock
.
§impl<'a, R, T> RwLockReadGuard<'a, R, T>where
R: RawRwLockFair + 'a,
T: 'a + ?Sized,
impl<'a, R, T> RwLockReadGuard<'a, R, T>where
R: RawRwLockFair + 'a,
T: 'a + ?Sized,
pub fn unlock_fair(s: RwLockReadGuard<'a, R, T>)
pub fn unlock_fair(s: RwLockReadGuard<'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 RwLockReadGuard
normally.
pub fn unlocked_fair<F, U>(s: &mut RwLockReadGuard<'a, R, T>, f: F) -> Uwhere
F: FnOnce() -> U,
pub fn unlocked_fair<F, U>(s: &mut RwLockReadGuard<'a, R, T>, f: F) -> Uwhere
F: FnOnce() -> U,
Temporarily unlocks the RwLock
to execute the given function.
The RwLock
is unlocked a fair unlock protocol.
This is safe because &mut
guarantees that there exist no other
references to the data protected by the RwLock
.
pub fn bump(s: &mut RwLockReadGuard<'a, R, T>)
pub fn bump(s: &mut RwLockReadGuard<'a, R, T>)
Temporarily yields the RwLock
to a waiting thread if there is one.
This method is functionally equivalent to calling unlock_fair
followed
by read
, however it can be much more efficient in the case where there
are no waiting threads.
Trait Implementations§
§impl<'a, R, T> Deref for RwLockReadGuard<'a, R, T>where
R: RawRwLock + 'a,
T: 'a + ?Sized,
impl<'a, R, T> Deref for RwLockReadGuard<'a, R, T>where
R: RawRwLock + 'a,
T: 'a + ?Sized,
Auto Trait Implementations§
impl<'a, R, T> !RefUnwindSafe for RwLockReadGuard<'a, R, T>
impl<'a, R, T: ?Sized> Send for RwLockReadGuard<'a, R, T>where
R: Sync,
T: Send + Sync,
<R as RawRwLock>::GuardMarker: Send,
impl<'a, R, T: ?Sized> Sync for RwLockReadGuard<'a, R, T>where
R: Sync,
T: Send + Sync,
<R as RawRwLock>::GuardMarker: Sync,
impl<'a, R, T: ?Sized> Unpin for RwLockReadGuard<'a, R, T>where
<R as RawRwLock>::GuardMarker: Unpin,
impl<'a, R, T> !UnwindSafe for RwLockReadGuard<'a, R, T>
Blanket Implementations§
§impl<T> Any for Twhere
T: Any + ?Sized,
impl<T> Any for Twhere
T: Any + ?Sized,
§fn type_id_compat(&self) -> TypeId
fn type_id_compat(&self) -> TypeId
§impl<T> ArchivePointee for T
impl<T> ArchivePointee for T
§type ArchivedMetadata = ()
type ArchivedMetadata = ()
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_: &<T as ArchivePointee>::ArchivedMetadata
) -> <T as Pointee>::Metadata
fn pointer_metadata(
_: &<T as ArchivePointee>::ArchivedMetadata
) -> <T as Pointee>::Metadata
§impl<F, W, T, D> Deserialize<With<T, W>, D> for Fwhere
W: DeserializeWith<F, T, D>,
D: Fallible + ?Sized,
F: ?Sized,
impl<F, W, T, D> Deserialize<With<T, W>, D> for Fwhere
W: DeserializeWith<F, T, D>,
D: Fallible + ?Sized,
F: ?Sized,
§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>
§impl<T> FutureExt for T
impl<T> FutureExt for T
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impl<T> Instrument for T
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fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
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§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.