Bug in sleep() function - main thread work affecting sleep duration on running tasks

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Update

Potentially, the following PR might be the answer to the bug report generated by the current topic.

This is slightly speculative, but it fixes #50643 which is a start. But it hasn’t been tested under heavy contention of the uv lock.
It also currently uses the normal mutex but we probably need to switch to a lock that has some form of fairness (maybe #50878 )

Remove in threaded region and add a thread that runs the UV loop by gbaraldi · Pull Request #50880 · JuliaLang/julia (github.com)

I didn’t have time to test if the above PR changes things - but I’ll do that soon and leave an update here.

Also, here is a (new) related topic that touches the issue raised by the current topic.

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