Re: [9fans] server push in 9P protocol

[Skip Tavakkolian <skip.tavakkolian@gmail.com>]

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search 9fans archives for 9P streaming. i think nemo and lsub crew had
experimented with some variation i believe.  i'm not sure if it is brought
into Clive, their new effort.


On Wed, Oct 15, 2014 at 8:56 AM, <smiley@icebubble.org> wrote:

> Hello,
>
> I'm wondering if there is any way to do server push using the 9P
> protocol.  I'm trying to imagine use of 9P for applications such as data
> acquisition.  One example might be caputing MIDI messages from digital
> musical instruments.
>
> As I understand the protocol, if an instrument served MIDI over 9P,
> every MIDI message would have to be explicitly requested with a Tread.
> And the instrument would have to wait for a Tread in order to send data.
> If the instrument (server) sent more than one Rread with the same tag,
> that would be a violation of the protocol.
>
> It might be possible to reverse roles: for the instrument to act as a 9P
> client and treat the MIDI host as a 9P server.  In that case, each MIDI
> message could take the form of a Twrite to the MIDI host.  But that
> would generate a series of Rwrites back from the host to the instrument,
> which would be unnecessary and have to be ignored.
>
> Another example might be isochronous data streams, such as video
> captured at a fixed framerate from a video capture device.  Having to
> send the same Tread or Rread 30x/second seems silly.
>
> So, is there any way use 9P in a server-push mode, where the server
> spits out a stream of data to be captured?
>
> Thanks!
>
>

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