RE: [tcljava-user] Tcl Extension

[Pierce, G. <Gre...@ls...>]

Hi Mo DeJong,

I can get my simple Tcl Extension to work in TclBlend if I do the
following:

=20
   Interp *iPtr =3D (Interp *) interp;
   Tcl_IncrRefCount(iPtr->objResultPtr);

   Tcl_WrongNumArgs(interp, 0, argv, "?pattern?");

The above Tcl_WrongNumArgs command will fail with the alloc error if I
don't
Increment the ref count for objResultPtr of the interpreter.

Does anyone know why I would have to do this? Why is the data in the Tcl
Interpreter getting messed up? Obviously, I don't want to have to do
this
so I need to figure out why I need to.

By the way, my Tcl Extension only has one command and the only thing
that
command does it call Tcl_WrongNumArgs. This is as basic Tcl Extension as
you can get and should work in TclBlend.

Greg


> -----Original Message-----
> From: tcl...@li...=20
> [mailto:tcl...@li...] On Behalf=20
> Of Mo DeJong
> Sent: Monday, February 06, 2006 9:27 PM
> To: tcl...@li...
> Subject: Re: [tcljava-user] Tcl Extension
>=20
> On Mon, 6 Feb 2006 13:40:10 -0700
> "Pierce, Greg" <Gre...@ls...> wrote:
>=20
> > Hi,
> > =20
> > I'm using TclBlend within a Java application to add scripting
> > capabilities.
> > =20
> > I have a C/C++ based Tcl Extension that I've developed and=20
> want to use
> > within a Tcl_Interp. I'm able to do a 'package require' of my Tcl
> > Extension
> > =20
> > Tcl_Interp interp;
> > interp.eval("package require Myext");
> > interp.eval("mycmd");
> > =20
> > but when the extension tries to execute a Tcl C API command like
> > Tcl_AppendResult within 'mycmd' it
> > crashes with an error like:
> > =20
> > alloc: invalid block: 0xb03be3e0: 1 0 0
> >=20
> > Does anyone know why this is happening?
> > =20
> > I've done some research on this alloc command error and=20
> what I've found
> > is that
> > it might be related to Tcl Threads. I need to make my application
> > "Thread-Safe".
> > Is this because TclBlend uses Threads?
>=20
> Yes, Tcl Blend needs to be used with a thread safe build of=20
> Tcl. Your extension
> also needs to be built with the same version of Tcl so that=20
> it makes use of thread
> safe APIs.
>=20
> > Question: Why does TclBlend need to use threads?
>=20
> Because Tcl Blend interacts with Java and Java is multi=20
> threaded. This means that
> thread safe APIs needs to be used in all the code running in=20
> your process. Here is
> a link that describes how to build Tcl and Tcl Blend so that=20
> they are thread safe.
> You should try recompiling your extension with the thread=20
> safe version of Tcl
> you built and see if that helps. You might also check the=20
> CFLAGS being used
> when your extension is compiled to make sure the proper flags=20
> are being passed
> on the compiler command line.
>=20
> http://wiki.tcl.tk/9993
>=20
> cheers
> Mo DeJong
>=20
>=20
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>=20