From: Eric Wong <normalperson@...>
Date: 2017-12-17T08:29:45+00:00
Subject: [ruby-core:84309] Re: [Ruby trunk Bug#14181] hangs or deadlocks from waitpid, threads, and trapping SIGCHLD

nobu@ruby-lang.org wrote:
> LGTM, and `timeval_add()` and `timeval_update_expire()` seem
> to worth extracting first.

Thanks for the review and you're right; they're not needed in
the final patch to fix the problem, I did not need to do timeval
arithmetic in thread_join_sleep after all.

Anyways, I split them into r61301 and r61302.

For 2.6; maybe we consider moving everything to timespec and
avoiding double/timeval for internal APIs

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