atomicell 0.2.0

Multi-threaded RefCell on atomics
Documentation 
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# Atomicell crate

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This crate provides `AtomicCell` type - a multi-threaded version of `RefCell` from standard library.
`AtomicCell` uses atomics to track borrows and able to guarantee
absence of mutable aliasing when multiple threads try to borrow concurrently.

Unlike mutexes and spin-locks `AtomicCell` does not have blocking calls.
Borrows are either succeed immediately or fail.

There are fallible that return optional for borrowing calls - [`AtomicCell::try_borrow`] and [`AtomicCell::try_borrow_mut`].

And panicking version - [`AtomicCell::borrow`] and [`AtomicCell::borrow_mut`].

[`AtomicCell::try_borrow`]: https://docs.rs/atomicell/latest/atomicell/struct.AtomicCell.html#method.try_borrow
[`AtomicCell::try_borrow_mut`]: https://docs.rs/atomicell/latest/atomicell/struct.AtomicCell.html#method.try_borrow_mut
[`AtomicCell::borrow`]: https://docs.rs/atomicell/latest/atomicell/struct.AtomicCell.html#method.borrow
[`AtomicCell::borrow_mut`]: https://docs.rs/atomicell/latest/atomicell/struct.AtomicCell.html#method.borrow_mut