Struct tor_guardmgr::GuardUsable
source · pub struct GuardUsable { /* private fields */ }
Expand description
A future used to see if we have “permission” to use a guard.
For efficiency, the GuardMgr
implementation sometimes gives
out lower-priority guards when it is not certain whether
higher-priority guards are running. After having built a circuit
with such a guard, the caller must wait on this future to see whether
the circuit is usable or not.
The circuit may be usable immediately (as happens if the guard was of sufficient priority, or if all higher-priority guards are known to be down). It may eventually become usable (if all of the higher-priority guards are discovered to be down). Or it may eventually become unusable (if we find a higher-priority guard that works).
Any GuardRestriction
s that were used to select this guard
may influence whether it is usable: if higher priority guards were
ignored because of a restriction, then we might use a guard that we
otherwise wouldn’t.
Trait Implementations§
source§impl Future for GuardUsable
impl Future for GuardUsable
impl<'pin> Unpin for GuardUsablewhere
__GuardUsable<'pin>: Unpin,
Auto Trait Implementations§
impl Freeze for GuardUsable
impl !RefUnwindSafe for GuardUsable
impl Send for GuardUsable
impl Sync for GuardUsable
impl !UnwindSafe for GuardUsable
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