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Re: Theads and FTP

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Arne Vajhøj <arne@vajhoej.dk> wrote:
> On 12/4/2011 4:14 PM, Daniel Pitts wrote:
>> On 12/3/11 8:31 PM, Roedy Green wrote:
>>> I have watched FTP voyager work. It seems to have at least two threads
>>> simultaneously uploading downloading. You might think what's the
>>> point. You can be transferring while you are waiting for the server
>>> to open or close a file and send back confirmation.
>>> I was wondering if this is done by logging on twice and having two
>>> completely independent sessions, or if FTP itself has some multithread
>>> ability.
>> Why not look up the RFC on the FTP protocol?
>> I seem to recall that it inherently uses two sockets, one for the
>> commands and one for transfers. I don't know if the command stream is
>> allowed (or expected) to be active during a transfer, I haven't read the
>> spec myself in quite a while.
>> Also, you don't necessarily need multiple threads to handle multiple
>> connections. In posix c "select()" is use to manage multiple connections.

> I believe it is possible to write a FTP client single threaded even
> without select.

Ok there's of course also poll(), and one could set all channels to
non-blocking mode and do a more or less(with sleep) busy loop iterating
through all the channels and see which of them have data...

Did you mean one of these, or was it a serious statement?

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Thread

Theads and FTP Roedy Green <see_website@mindprod.com.invalid> - 2011-12-03 20:31 -0800
  Re: Theads and FTP Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-12-04 13:14 -0800
    Re: Theads and FTP Arne Vajhøj <arne@vajhoej.dk> - 2011-12-04 22:06 -0500
      Re: Theads and FTP Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-12-05 14:58 +0000
        Re: Theads and FTP Arne Vajhøj <arne@vajhoej.dk> - 2011-12-05 22:01 -0500
          Re: Theads and FTP Tom Anderson <twic@urchin.earth.li> - 2011-12-06 21:07 +0000
    Re: Theads and FTP Roedy Green <see_website@mindprod.com.invalid> - 2011-12-05 05:33 -0800
      Re: Theads and FTP Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-12-05 09:29 -0800
      Re: Theads and FTP Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-12-05 12:29 -0600
        Re: Theads and FTP Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-12-06 11:28 -0600
      Re: Theads and FTP Arne Vajhøj <arne@vajhoej.dk> - 2011-12-05 22:00 -0500
      Re: Theads and FTP Tom Anderson <twic@urchin.earth.li> - 2011-12-06 22:16 +0000
  Re: Theads and FTP Arne Vajhøj <arne@vajhoej.dk> - 2011-12-04 22:04 -0500

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