pub struct SharedMutArc<T> {
dir: RwLock<Option<Arc<T>>>,
}
experimental-api
only.Expand description
A shareable mutable-ish optional reference to a an Arc
.
Because you can’t actually change a shared Arc
, this type implements
mutability by replacing the Arc itself with a new value. It tries
to avoid needless clones by taking advantage of Arc::make_mut
.
Fields§
§dir: RwLock<Option<Arc<T>>>
Locked reference to the current value.
(It’s okay to use RwLock here, because we never suspend while holding the lock.)
Implementations§
Sourcepub fn get(&self) -> Option<Arc<T>>
pub fn get(&self) -> Option<Arc<T>>
Return a new reference to the current value, if there is one.
Sourcepub fn mutate<F, U>(&self, func: F) -> Result<U>
pub fn mutate<F, U>(&self, func: F) -> Result<U>
Replace the contents of this SharedMutArc with the results of applying
func
to the inner value.
Gives an error if there is no inner value.
Other threads will not abe able to access the inner value while the function is running.
§Limitation: No panic-safety
If func
panics while it’s running, this object will become invalid
and future attempts to use it will panic. (TODO: Fix this.)
Trait Implementations§
Source§fn get_netdir(&self) -> Option<Arc<NetDir>>
fn get_netdir(&self) -> Option<Arc<NetDir>>
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