Struct parking_lot::RwLockReadGuard [−][src]
#[must_use]pub struct RwLockReadGuard<'a, T: ?Sized + 'a> { /* fields omitted */ }
RAII structure used to release the shared read access of a lock when dropped.
Methods
impl<'a, T: ?Sized + 'a> RwLockReadGuard<'a, T>
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impl<'a, T: ?Sized + 'a> RwLockReadGuard<'a, T>
pub fn unlock_fair(self)
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pub fn unlock_fair(self)
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 map<U: ?Sized, F>(orig: Self, f: F) -> RwLockReadGuard<'a, U> where
F: FnOnce(&T) -> &U,
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pub fn map<U: ?Sized, F>(orig: Self, f: F) -> RwLockReadGuard<'a, U> where
F: FnOnce(&T) -> &U,
Make a new RwLockReadGuard
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.
Trait Implementations
impl<'a, T: ?Sized + Sync + 'a> Sync for RwLockReadGuard<'a, T>
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impl<'a, T: ?Sized + Sync + 'a> Sync for RwLockReadGuard<'a, T>
impl<'a, T: ?Sized + 'a> Deref for RwLockReadGuard<'a, T>
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impl<'a, T: ?Sized + 'a> Deref for RwLockReadGuard<'a, T>
type Target = T
The resulting type after dereferencing.
fn deref(&self) -> &T
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fn deref(&self) -> &T
Dereferences the value.
impl<'a, T: ?Sized + 'a> Drop for RwLockReadGuard<'a, T>
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impl<'a, T: ?Sized + 'a> Drop for RwLockReadGuard<'a, T>
impl<'a, T: ?Sized> StableAddress for RwLockReadGuard<'a, T>
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impl<'a, T: ?Sized> StableAddress for RwLockReadGuard<'a, T>
Auto Trait Implementations
impl<'a, T> !Send for RwLockReadGuard<'a, T>
impl<'a, T> !Send for RwLockReadGuard<'a, T>