From: Eric Wong <normalperson@...>
Date: 2018-06-28T07:04:24+00:00
Subject: [ruby-core:87661] Re: [Ruby trunk Bug#14867] Process.wait can wait for MJIT compiler process

nobu@ruby-lang.org wrote:
> Since r63758, `rb_waitpid()` hangs up frequently (not always) on macOS (darwin17).
> Seems `SIGCHLD` is not delivered.

Does removing some of the pthread_sigmask changes from that
alleviate the problem?  I try to force SIGCHLD to only be
delivered to timer-thread (to avoid spurious wakeups for
test/-ext-/gvl/test_last_thread.rb)

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