From: Eric Wong <normalperson@...>
Date: 2019-01-03T01:58:20+00:00
Subject: [ruby-core:90866] Re: [Ruby trunk Bug#15499] Breaking behavior on ruby 2.6: rb_thread_call_without_gvl doesn't invoke unblock_function when used on the main thread

> https://bugs.ruby-lang.org/issues/15499

Probably my fault with timer-thread elimination :<

I think we'll need to dynamically enable timer-thread
for certain unblock functions.

Can you try compiling with "cppflags=-DUBF_TIMER=2" ?

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