Re: Multi-threaded

[Toralf Lund <toralf lund pgs com>]

Toralf Lund wrote:
> Frank.Rehberger wrote:
>   
> > Toralf Lund wrote:
> >   
> >     
> > > First question: Is this list actually alive???
> > >     
> > >       
> > Yes, the list is alive, but little conversation going on ;)
> >
> >   
> >     
> > > Second question: Can anyone explain how to set up an ORBit2 server so
> > > that it can process several requests in parallel via multi-threading?
> > >
> > >     
> > >       
> > Did you take a look at this page?
> >
> > http://projects.gnome.org/ORBit2/orbit-docs/orbit/x1223.html#AEN1229
> >   
> >     
> No. I didn't notice that example. Thanks.
>
> I had actually tried parts of this, but I see at least one call that I'm 
> assuming might make a difference:
>
> *ORBit_ObjectAdaptor_set_thread_hint ((ORBit_ObjectAdaptor) child_poa, 
> 					     ORBIT_THREAD_HINT_PER_REQUEST);*
>
> However, I don't really understand the example if it's supposed to run 
> multiple threads. I mean, I can see only one extra thread getting 
> created, and the original main thread doesn't do CORBA operations at 
> all. But if there is just one thread doing CORBA, why do they bother to 
> send "multi-threading" options to the POA?
>   
OK. I figured it out eventually. The above mentioned call is pretty much 
the key to it all. I tried it earlier, but unfortunately, I had called 
it with the wrong "POA" object (the RootPOA rather than its child.) When 
I got it right, however, I the request would start running in threads of 
their own just like that - without the need for any threading calls as such.

So I really don't understand why the FAQ and example code has to drag 
threads created by the application into it all. This just confuses 
matters, as application threads and ORB threads have little to do with 
each other. To get multithreaded ORB operation you pretty much go about 
everything as if you were writing a single-threaded application, only 
you have to take care to set certain options on the POA object. Besides 
making sure the method implementation is thread safe, obviously...

- Toralf

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