[Twisted-Python] how to cancel a long running job on a server ?

[Itamar Shtull-Trauring]

On Tue, 2005-05-10 at 12:26 +0200, Thomas Jung wrote:

> I have a server, where I can remotely call a function like remote_calc(), 
> using the perspective broker,
> which returns giving a result.
> Sometimes, I want to cancel that computation, calling e.g. remote_cancel() 
> (which remains to be implemented.....)
> 
> How can I have remote_calc() not to return before the result is done, and 
> still be able to call remote_cancel while its running ?
>     def remote_calc(self,result):
>         print "server::calc: ..."
> 
>        # thought this would wait until done, but doesnt....
> 
>         calc(threads.deferToThread(do_calc))
>         print "server::calc: returning"
>         return 123

You probably want to return the result of calc() here - if you return
deferred from PB function it will know not to return until Deferred has
result.