From: Junio C Hamano <gitster@pobox.com>
Date: Fri, 19 Oct 2012 17:02:48 GMT
Subject: Re: Fix potential hang in https handshake.
Message-ID: <7vpq4ejsxz.fsf@alter.siamese.dyndns.org>
In-Reply-To: <CAHOQ7J9W8FdKqzqbuDqj4bcFyN02kUigWtbL_xCen-PYWF9LUg@mail.gmail.com>

Stefan Zager <szager@google.com> writes:

> On Oct 19, 2012 7:11 AM, "Shawn Pearce" <spearce@spearce.org> wrote:
>>
>> The issue with the current code is sometimes when libcurl is opening a
>> CONNECT style connection through an HTTP proxy it returns a crazy high
>> timeout (>240 seconds) and no fds. In this case Git waits forever.
>> Stefan observed that using a timeout of 50 ms in this situation to
>> poll libcurl is better, as it figures out a lot more quickly that it
>> is connected to the proxy and can issue the request.
>
> Correct.  Anecdotally, the zero-file-descriptor situation happens only once
> per process invocation, so the risk of passing a too-long timeout to
> select() is small.

Thanks.