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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