On Tue, 11 Dec 2018, "h9791521_at_docomo.ne.jp" via curl-library wrote:

> When I call curl_multi_perform, it sometimes does not return while its
> thread uses 100% cpu resources. It happens sometimes, not always. I use
> libcurl 7.59.0 on windows.

I think you need to help out a bit more and provide us with a reproducible
example for us to understand and debug this issue.

While I can't spot any significant change done since 7.59.0 that seems likely
to have fixed such an issue, I would still urge you to try out the latest
version first before spending a lot of time hunting this down. It might
already be fixed!

> The loop happens on systems where time_t is defined to an unsigned type.

This stood out to me. Isn't Windows always using a signed time_t ?

When you build on a system with unsigned time_t, you MUST also define
HAVE_TIME_T_UNSIGNED, did you do that?

-- 
  / daniel.haxx.se
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