Replace implementation of `AtomicBool` etc. by atomic from the standard library

[ahoppen]

We should be able to raise the deployment target of SourceKit-LSP to macOS 14.0 and thus use the atomics from the standard library.

[ahoppen]

Synced to Apple’s issue tracker as rdar://143438616

[mustiikhalil]

I wonder if replacing it with a ManagedAtomic<Type> would be more than enough or does it have to be UnsafeAtomic?

[ahoppen]

I meant ManagedAtomic by the atomic types in the standard library.

[mustiikhalil]

Perfect! I can take a look at this by the end of this week

[mustiikhalil]

Do we want to always import swift-atomics in each and every framework? or should we write a wrapper around it?

example:

struct Atomic<T> {
  let lock: ManagedAtomic<T>

var value: T? {
  get { lock.load(ordering: ....)  }
  set { lock.store(newValue, ordering: ....) }
}

The code above will replace somthing like this:

let lock = ManagedAtomic(false)
/// some code
lock.store(v, ordering: ...)
/// more code
if lock.load(ordering: ....) {

}

[ahoppen]

I was thinking to use the Atomic type that’s available in the standard library: https://github.com/swiftlang/swift-evolution/blob/main/proposals/0410-atomics.md

[mustiikhalil]

Oh I didn't know that existed within the Synchronization framework.

At the same time wouldn't that only work on swift 6 and above? Is deprecating swift 5.10 support in the libraries roadmap?

https://github.com/swiftlang/swift/blob/c14561fba3c057a247f5bcaa514536cd0d22102b/stdlib/public/Synchronization/Atomics/Atomic.swift#L20

(And it seems that that Atomics is based on macOS 15, not sure yet. Still trying to figure out why Xcode is misbehaving)

[ahoppen]

Yes, we can raise the deployment target to macOS 15 on main, so we can use Synchronization.