From: Eric Wong <normalperson@...>
Date: 2019-01-03T22:33:09+00:00
Subject: [ruby-core:90879] 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

apolcyn@google.com wrote:
> Thanks for the quick look! I didn't get a chance to try out
> UBF_TIMER=2 before your last comment, but let me know if
> there's something else to try.

Sorry for the breakage.  For now, you can workaround this
breakage by spawning a do-nothing thread to handle signals:

  Thread.new { sleep }

I'm slowly working on a permanent fix which won't increase
overhead for the majority of use cases.

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