Hey,
Thanks for the info. I'll certainly look into the CFNetwork API. I was really
hoping for a nice solution to come about for the cocoa API's but I've since
given up hope and started using libcurl, which is actually a really nice
library to work with.
Thanks for all the help
> Subject: Re: NSRunloop + shared thread
> From: hank.l...@runbox.com
> Date: Fri, 20 Nov 2009 09:28:02 -0500
> CC: colde...@hotmail.com; cocoa-dev@lists.apple.com
> To: j...@mooseyard.com
>
> On Nov 19, 2009, at 7:51 PM, Jens Alfke wrote:
>
> > On Nov 19, 2009, at 3:40 PM, Colin Deasy wrote:
> >
> >> This shared thread is actually handling potentially large numbers of
> >> concurrent url connections/downloads. The reason that I want a block in
> >> some of those at different times is a for a form of bandwidth control I am
> >> trying to do.
> >
> > I don't think that will do what you want. The actual socket I/O happens in
> > a background thread owned by CFNetwork; I don't think that thread will stop
> > reading data just because your callback on the main thread hasn't returned
> > yet. It just means that, when you do return, you'll immediately get a
> > bigger chunk of data.
> >
> > I've seen this general question of rate limiting asked on the
> > macnetworkprog list. IIRC the answer is that Foundation and CFNetwork don't
> > really give you the tools to do it. You'd have to write your own code using
> > low-level BSD sockets APIs. :-P
>
> You can actually do this using CFNetwork. If you schedule your read stream on
> a runloop and read the bytes you want in the appropriate callback (one of
> type CFReadStreamClientCallBack) with CFReadStreamRead, you can successfully
> control the bandwidth by limiting the number of calls to CFReadStreamRead.
>
> Hank
>
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