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CHANGELOG.md

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0.4.8

  • Backport of fix to soundness issue in #45 (access::Map from Constant can lead to dangling references).

0.4.7

  • Rename the unstable-weak to weak feature. The support is now available on 1.45 (currently in beta).

0.4.6

  • Adjust to Weak::as_ptr from std (the weak pointer support, relying on unstable features).
  • Support running on miri (without some optimizations), so dependencies may run miri tests.
  • Little optimization when waiting out the contention on write operations.

0.4.5

  • Added Guard::from_inner.

0.4.4

  • Top-level docs rewrite (less rambling, hopefully more readable).

0.4.3

  • Fix the Display implementation on Guard to correctly delegate to the underlying Display implementation.

0.4.2

  • The Access functionality ‒ ability to pass a handle to subpart of held data to somewhere with the ability to update itself.
  • Mapped cache can take FnMut as well as Fn.

0.4.1

  • Mapped caches ‒ to allow giving access to parts of config only.

0.4.0

  • Support for Weak pointers.
  • RefCnt implemented for Rc.
  • Breaking: Big API cleanups.
    • Peek is gone.
    • Terminology of getting the data unified to load.
    • There's only one kind of Guard now.
    • Guard derefs to the Arc/Option<Arc> or similar.
    • Cache got moved to top level of the crate.
    • Several now unneeded semi-internal traits and trait methods got removed.
  • Splitting benchmarks into a separate sub-crate.
  • Minor documentation improvements.

0.3.11

  • Prevention against UB due to dropping Guards and overflowing the guard counter (aborting instead, such problem is very degenerate anyway and wouldn't work in the first place).

0.3.10

  • Tweak slot allocation to take smaller performance hit if some leases are held.
  • Increase the number of lease slots per thread to 8.
  • Added a cache for faster access by keeping an already loaded instance around.

0.3.9

  • Fix Send/Sync for Guard and Lease (they were broken in the safe but uncomfortable direction ‒ not implementing them even if they could).

0.3.8

  • Lease<Option<_>>::unwrap(), expect() and into_option() for convenient use.

0.3.7

  • Use the correct #[deprecated] syntax.

0.3.6

  • Another locking store (PrivateSharded) to complement the global and private unsharded ones.
  • Comparison to other crates/approaches in the docs.

0.3.5

  • Updates to documentation, made it hopefully easier to digest.
  • Added the ability to separate gen-locks of one ArcSwapAny from others.
  • Some speed improvements by inlining.
  • Simplified the lease method internally, making it faster in optimistic cases.

0.3.4

  • Another potentially weak ordering discovered (with even less practical effect than the previous).

0.3.3

  • Increased potentially weak ordering (probably without any practical effect).

0.3.2

  • Documentation link fix.

0.3.1

  • Few convenience constructors.
  • More tests (some randomized property testing).

0.3.0

  • compare_and_swap no longer takes &Guard as current as that is a sure way to create a deadlock.
  • Introduced Lease for temporary storage, which doesn't suffer from contention like load, but doesn't block writes like Guard. The downside is it slows down with number of held by the current thread.
  • compare_and_swap and rcu uses leases.
  • Made the ArcSwap as small as the pointer itself, by making the shards/counters and generation ID global. This comes at a theoretical cost of more contention when different threads use different instances.

0.2.0

  • Added an ArcSwapOption, which allows storing NULL values (as None) as well as a valid pointer.
  • compare_and_swap accepts borrowed Arc as current and doesn't consume one ref count.
  • Sharding internal counters, to improve performance on read-mostly contented scenarios.
  • Providing peek_signal_safe as the only async signal safe method to use inside signal handlers. This removes the footgun with dropping the Arc returned from load inside a signal handler.

0.1.4

  • The peek method to use the Arc inside without incrementing the reference count.
  • Some more (and hopefully better) benchmarks.

0.1.3

  • Documentation fix (swap is not lock-free in current implementation).

0.1.2

  • More freedom in the rcu and rcu_unwrap return types.

0.1.1

  • rcu support.
  • compare_and_swap support.
  • Added some primitive benchmarks.

0.1.0

  • Initial implementation.