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Date: Thu, 3 Jan 2019 01:58:20 +0000
From: Eric Wong <normalperson@yhbt.net>
To: ruby-core@ruby-lang.org
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References: <redmine.issue-15499.20190103013749@ruby-lang.org>
 <redmine.issue-15499.20190103013749.e0bfe8020070231f@ruby-lang.org>
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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
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> 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" ?