Re: [Boost-users] [asio] SSL async_shutdown() never finishes if called when async_read_some() is in progress

Subject: Re: [Boost-users] [asio] SSL async_shutdown() never finishes if called when async_read_some() is in progress
From: Vinnie Falco (vinnie.falco_at_[hidden])
Date: 2018-04-06 13:55:16

On Fri, Apr 6, 2018 at 6:11 AM, Alexander D. via Boost-users
<boost-users_at_[hidden]> wrote:
>>> 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.
>>
>>    sock.next_layer().cancel();
>>
>>?
>
> Per ASIO Reference:
>
> "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:
> ..."
>
> which renders cancel() non-portable.

I consider the issues with cancel present in Windows XP and Windows
Server 2003 to be sufficiently problematic that it is not worth taking
them into account when designing robust network applications (I do
develop mostly on Windows). Unless you have a specific business need
to support those defective operating systems, I would just ignore
them.