cats-effect issues

Optimize `EpollSystem` on Native

2

- Replace `@volatile`s with loads/stores with precise memory orders - Replace `TrieMap` with `ConcurrentHashMap` ? - Replace `unistd.{write,read}` with bindings not marked `@blocking`

armanbilge

Implement `TimerHeap#Node` on Native without `@safePublish`

armanbilge

Update submodule in site for 3.6

djspiewak

:books: docs

Consider implementing non-daemon thread warning on SN

Follow up from #4201 We didn't port this over, but it's probably just as meaningful on Native as it is on the JVM.

djspiewak

Implement blocked thread detection on SN

Following up from #4201 We didn't port over blocked thread detection. Should experiment with how this works on native and enable it if possible.

djspiewak

Remove TODO in `IOFiber.readBarrier()`

3

#4320 benchmark reference: ``` withBarrier (volatile) : ~5.2M ops/s withoutBarrier (plain) : ~5.3M ops/s (unsafe for fibers) javaFullFence : ~800K ops/s (overkill) ``` optimizing further makes no sense because `VarHandle/Unsafe`...

qxrein