# 1.6.0
* Fix a data race reported by MIRI.
* Avoid violating stacked borrows (AFAIK these are still experimental and not
normative, but better safe than sorry). (#80).
* The `AccessConvert` wrapper is needed less often in practice (#77).
# 1.5.1
* bug: Insufficient synchronization on weak platforms (#76).
Never observed in practice (it's suspected practical weak platforms like ARM
are still stronger than the model), but still technically UB.
* docs: Mention triomphe's `ThinArc` around the fat-pointer limitations.
# 1.5.0
* Support serde (by a feature).
# 1.4.0
* Allow const-initializing ArcSwapOption (`const_empty` method).
# 1.3.2
* More helpful description of the `AsRaw` trait (isn't implemented for owned
`Arc`/`Option<Arc>`).
# 1.3.1
* Cache doc improvements.
# 1.3.0
* Allow mapping of DynAccess.
* Fix some lints.
* Don't leave threads running in tests/doctests. It's a bad form and annoys
miri.
# 1.2.0
* Miri and 32 bit tests in CI.
* Making the writers lock-free. Soft-removing the IndependentStrategy, as it is
no longer needed (hidden and the same as the DafultStrategy).
# 1.1.0
* Fix soundness bug around access::Map. Technically a breaking change, but
unlikely to bite and breaking seems to be the least bad option. #45.
# 1.0.0
* Remove Clone implementation. People are often confused by it and it is easy to
emulate by hand in the rare case it is actually needed.
# 1.0.0-rc1
* Get rid of the `load_signal_safe`. It only complicates things and it is niche;
signal-hook-registry has its own simplified version.
* Avoid `from_ptr(as_ptr())`. Slight change in `RefCnt::inc` which technically
is API breaking change, but this one should not matter in practice.
* Extend documentation about clone behaviour.
* Few more traits for Guard (`From<T: RefCnt>`, `Default`).
* Get rid of `rcu_unwap`, the whole concept is a trap.
* Hide the whole gen lock thing.
* Introduce the `Strategy`, as a high level way to choose how exactly the
locking happens.
- Not possible to implement by downstream users just yet, or call them.
- The CaS is its own trait for flexibility.
* Adding the SimpleGenLock experimental strategy.
- Not part of stability guarantees.
# 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.