Re: [Yap-users] multiple instances of YAP from c

[Vitor S. C. <vs...@gm...>]

Dear Davide.

Sorry for the delay


> is it possible to create multiple prolog interpreters in the same C/C++
> program?

Yes, if you have -DTHREADS (or if you use --enable-threads).

> As far as I know, functions such as YAP_FastInit and YAP_RunGoalOnce are
> global, so I cannot initialize multiple instances.

FastInit will create a single database, thaat will be shared by all
threads. But threads can run separate, and RunGoal shsould be
thread-local. Have a look at

YAP_ThreadCreateEngine, YAP_ThreadAttachEngine,
YAP_ThreadDetachEngine, YAP_ThreadDestroyEngine. YAP also supports the
thread creation ops in the SWi interface:

PL_thread_self()
PL_unify_thread_id()
PL_thread_attach_engine()
PL_thread_destroy_engine()
PL_thread_at_exit()


> In particular, I'm creating a c++ class that calls yap, so I would like
> to create a new instance of yap prolog every time I create a new object
> of the class. Thus every object will call and use yap independently in
> the same c++ program.


You may want to have a look at the directory CXX in yap-6.3.4. It is
designed to interface with the swig package, but it is growing
quickly. Any feedback, extensions or patches will be much appreciated!

Vitor

>
> thanks!
>
> regards,
> Davide
>
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