Reboot: Update Select.jl for multithreaded, modern Julia#1

Merged

NHDaly merged 22 commits intomasterfrom reboot

Sep 4, 2019

+361-119

Commits on Sep 3, 2019

Fixed deprecations, working on fixing behavior
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Update wait_put for new Channel implementation
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Make wait_put thread-safe -- (I think?)
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Trying to fix scoping for channel and value vars -- maybe i only need to do it for channel if i can assume value var is _always_ a name
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Aha: found problem! Committing before trying to fix.
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Fix threading-correctness && switch to at-spawn (instead of at-async) for select blocking: unite entire algorithm inside the lock
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BUG: Reenable the at-infos I was using for debugging to show uv multithreading exception
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Revert "BUG: Reenable the at-infos I was using for debugging to show uv multithreading exception"
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Fix to also work with Tasks, not just Channels
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Fixed coordination b/w unrelated Cases: add synchronization on "case_lock"
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Fixed put again. Tried to fix the circular reference problem, but failed
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Undoing the extra loop, which didn't actually help anything
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Switch to multithreading the separate tasks in Select
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Commits on Sep 4, 2019