ulTickleMe

[Mark Smith]

Dave, thanks. I just curious, really, and now I know!

Best,

Mark

On 4 Aug 2006, at 06:40, Dave Cragg wrote:

>
> On 3 Aug 2006, at 18:22, Mark Smith wrote:
>
>> Dave, (or anyone else who knows),
>>
>> what is the ulTickleMe message that I see in the pending messages?  
>> I'm assuming that the 'ul' connects it with libURL.
>
> This was added to libUrl at some point to overcome an occasional  
> problem with the "wait for messages" command which is used heavily  
> in libUrl. The ulTickleMe message is sent every second while a  
> socket is open and forces the "wait for messages" lines to stop  
> waiting. If I recall correctly, the problem was specific to a  
> particular engine version, so I should probably re-examine whether  
> it is needed anymore.
>
> With an ftp upload, it will continue to fire for a short time after  
> the upload has completed, as the ftp session is kept open for  
> possible re-use. (The default time is 15 seconds.) With http  
> downloads, it will continue until the server closes the connection  
> which varies from "immediately" to a number of minutes. (But a few  
> seconds is typical.)
>
> If you're running a routine that deletes all the pending messages,  
> I doubt it will do any harm.
>
> Cheers
> Dave
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