<div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr">On Fri, 6 Apr 2018, 19:50 Franz Fehringer via Boost-users, <<a href="mailto:boost-users@lists.boost.org">boost-users@lists.boost.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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It's Boris Karloff but Chris(topher) Kohlhoff :-)<br></div></blockquote></div></div><div dir="auto"><br></div><div dir="auto">Ah yes, important difference. :) </div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div text="#000000" bgcolor="#FFFFFF">
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<div class="m_6558752578128498274moz-cite-prefix">Am 06.04.2018 um 16:37 schrieb Richard
Hodges via Boost-users:<br>
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<div class="gmail_quote">On 6 April 2018 at 16:29, Alexander
D. via Boost-users <span dir="ltr"><<a href="mailto:boost-users@lists.boost.org" target="_blank" rel="noreferrer">boost-users@lists.boost.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span class="m_6558752578128498274gmail-">On
April 6, 2018 9:55 PM, Vinnie Falco via Boost-users <<a href="mailto:boost-users@lists.boost.org" target="_blank" rel="noreferrer">boost-users@lists.boost.org</a>>
wrote:<br>
> On Fri, Apr 6, 2018 at 6:11 AM, Alexander D. via
Boost-users<br>
> <<a href="mailto:boost-users@lists.boost.org" target="_blank" rel="noreferrer">boost-users@lists.boost.org</a>>
wrote:<br>
>>>> The only solution I can think of would
be to cancel the read operation, but there's no portable
way in asio to do this.<br>
>>><br>
>>> sock.next_layer().cancel();<br>
>>><br>
>>> ?<br>
>><br>
>> Per ASIO Reference:<br>
>><br>
>> "Calls to cancel() will always fail with
boost::asio::error::operation_not_supported when
run on Windows XP, Windows Server 2003, and earlier
versions of Windows, unless BOOST_ASIO_ENABLE_CANCELIO
is defined. However, the CancelIo function has two
issues that should be considered before enabling its
use:<br>
>> ..."<br>
>><br>
>> which renders cancel() non-portable.<br>
><br>
> I consider the issues with cancel present in
Windows XP and Windows<br>
> Server 2003 to be sufficiently problematic that it
is not worth taking<br>
> them into account when designing robust network
applications (I do<br>
> develop mostly on Windows). Unless you have a
specific business need<br>
> to support those defective operating systems, I
would just ignore<br>
> them.<br>
<br>
</span>Yes, I do need the program to work on at least
Windows XP.<br>
<br>
However, even if cancel() is used, it is a workaround, not
a solution. If you run the code I supplied, you'll notice
that async_read_some() is actually finished with a "stream
truncated" error, quite similar to "canceling" the read.
The problem is on async_shutdown()'s handler not being
called, and it's not mentioned anywhere in the reference.
Why can't we shutdown a stream while reading from it
(since we can close a socket while reading)?<br>
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<div>In the past, when I have had queries about the inner
workings and design decisions behind ASIO, I have emailed
the author, Chris Karloff. I am sure he is a busy guy but
he has taken the trouble to answer helpfully in the past.
It may be worth dropping him a line and asking for a
suggestion.<br>
<br>
He didn't charge me but having received help twice now, I
think it would be rude of me not to offer him a few hours
consultancy if I needed his help again. </div>
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<a href="https://think-async.com/Asio/CommercialSupport" target="_blank" rel="noreferrer">https://think-async.com/Asio/CommercialSupport</a><br>
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