[DGD] Revisited: callout cantrip

[bart at wotf.org]

For those curious about this trick, Gurbalib svn revision 271 now uses this
call_out 'cantrip' idea in its event daemon. In /daemons/event_d.c in the
dispatch_event() function, you'll see that the counters are passed to a
call_out as an array, and then modified after the call_out has been started.

Bart.

On Sat, 14 Mar 2009 02:16:49 -0700, Shentino wrote
> Ok, so I was sitting back for a bit, experimenting with callouts,
>  and I suddenly had the bright idea of trying to pass a callout its 
> callout handle as an argument.
> 
> Naturally, owing to causality, not very straightforward.
> 
> Apparently arguments on pending callouts share the object's 
> dataspace, so what I was able to do was pass a one element array,
>  have the callout scheduled, and then modify the array in place ala 
> TLS/call_trace, thus giving the callout information on what its 
> handle was. ___________________________________________
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