[libmicrohttpd] Epoll busy looping for HTTPS

[louisbenoit]

Hi,

I am doing test with HTTPS at low bit rate for large files using:
wget -v --no-check-certificate --limit-rate=1000 https://....

When the MHD daemon is configured with MHD_USE_EPOLL_INTERNALLY_LINUX_ONLY, I noticed that the thread takes 100% CPU, whereas
the MHD_USE_POLL_INTERNALLY configuration show a normal CPU usage.

Adding logs I see that the busy loops takes place at daemon.c, line 2605 (0.9.38):
daemon->eready_tail never gets NULL most probably due to connection.c, line 2671 to 2721

Thanks,

Louis