Re: Multiple instances for embedded prolog interpreter

Hi Stefan,

In the manual see: 8 Multithreaded applications
	http://www.swi-prolog.org/pldoc/man?section=threads

And there specially 8.7 Multithreaded mixed C and Prolog applications
	http://www.swi-prolog.org/pldoc/man?section=foreignthread

hope this helps

--

Uwe 



> -----Original Message-----
> From: [email protected]
> bonn.de [mailto:swi-prolog-bounces+lesta=sbs-
> [email protected]] On Behalf Of Stefan Radomski
> Sent: Tuesday, July 23, 2013 2:23 PM
> To: [email protected]
> Subject: [SWIPL] Multiple instances for embedded prolog interpreter
> 
> Hey there,
> 
> we embedded SWI prolog as a logic engine via its C++ interface and it's
> working great. But we do need more than one instance of the PLEngine or
> at least distinct states. Seeing that PL_initialise will just
> initialize a global prolog interpreter, and the foreign predicates will
> not receive any kind of callbacks, we figured that there can only ever
> be one instance per runtime.
> 
> If that's the case, can we "simulate" multiple instances i.e. by
> swapping the interpreters state before calling any of the PL*
> functions? We do not necessarily need concurrency, just distinct
> states. We pondered about using several PLFrames to achieve something
> like that but it seems that they will just "rollback" any term
> references when closing.
> 
> If this issue has been discussed previously, please be so kind as to
> provide a link.
> 
> Best regards
> Stefan Radomski
> 
> 
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