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RcuLeaseAccumulator

vstd_extra::rcu_read_lease

Struct RcuLeaseAccumulator 

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pub struct RcuLeaseAccumulator<T> { /* private fields */ }
Expand description

Owner-side fractional accumulator for one delayed-reclamation resource.

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impl<T> RcuLeaseAccumulator<T>

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pub proof fn new(tracked resource: T) -> tracked res : Self

ensures
res.resource() == resource,
res.fraction() == 1real,

Stores resource and creates a whole read accumulator.

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pub closed spec fn id(self) -> Loc

Storage-protocol identity shared by this accumulator and all of its leases.

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pub closed spec fn resource(self) -> T

The resource retained in storage while read leases exist.

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pub closed spec fn fraction(self) -> real

Rational fraction currently accumulated by the owner.

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pub proof fn split_lease(tracked &mut self) -> tracked lease : RcuReadLease<T>

ensures
final(self).id() == old(self).id(),
final(self).resource() == old(self).resource(),
lease.id() == old(self).id(),
lease.resource() == old(self).resource(),
final(self).fraction() == old(self).fraction() / 2real,
lease.fraction() == old(self).fraction() / 2real,

Splits a fresh lease without imposing a fixed reader capacity.

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pub proof fn return_lease(tracked &mut self, tracked lease: RcuReadLease<T>)

requires
old(self).id() == lease.id(),
ensures
final(self).id() == old(self).id(),
final(self).resource() == old(self).resource(),
final(self).resource() == lease.resource(),
final(self).fraction() == old(self).fraction() + lease.fraction(),

Returns one lease to its originating accumulator.

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pub proof fn reclaim(tracked self) -> tracked resource : T

requires
self.fraction() == 1real,
ensures
resource == self.resource(),

Recovers the stored resource after every lease has returned.

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pub proof fn lemma_fraction_bounded(tracked &self)

ensures
0real < self.fraction() <= 1real,

Establishes the valid range of the accumulated rational fraction.

Auto Trait Implementations§

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impl<T> Freeze for RcuLeaseAccumulator<T>

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impl<T> RefUnwindSafe for RcuLeaseAccumulator<T>
where T: RefUnwindSafe,

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impl<T> Send for RcuLeaseAccumulator<T>
where T: Send + Sync,

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impl<T> Sync for RcuLeaseAccumulator<T>
where T: Sync + Send,

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impl<T> Unpin for RcuLeaseAccumulator<T>
where T: Unpin,

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impl<T> UnsafeUnpin for RcuLeaseAccumulator<T>

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impl<T> UnwindSafe for RcuLeaseAccumulator<T>
where T: UnwindSafe,

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impl<T> Any for T
where T: 'static + ?Sized,

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