RE: [tcljava-user] Tcl Extension

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

=20
Hi Mo,

I think I found my problem. I wasn't using the libtclstubs8.4.a library
I was using the libtcl8.4.a library while compiling my extension. Also,
I wasn't including the -DUSE_TCL_STUBS while compiling.

My problems seem to have gone away (for now). I need to do some further
testing, but I think my problem has been solved.

This is a good lesson since my extension worked fine with a basic tcl
interperter (i.e. tclsh). However, as soon as I tried to use it in
TclBlend
I had problems.

Greg

> -----Original Message-----
> From: tcl...@li...=20
> [mailto:tcl...@li...] On Behalf=20
> Of Pierce, Greg
> Sent: Wednesday, February 08, 2006 2:05 PM
> To: tcl...@li...
> Subject: RE: [tcljava-user] Tcl Extension
>=20
> Hi Mo DeJong,
>=20
> I can get my simple Tcl Extension to work in TclBlend if I do the
> following:
>=20
> =20
>    Interp *iPtr =3D (Interp *) interp;
>    Tcl_IncrRefCount(iPtr->objResultPtr);
>=20
>    Tcl_WrongNumArgs(interp, 0, argv, "?pattern?");
>=20
> The above Tcl_WrongNumArgs command will fail with the alloc error if I
> don't
> Increment the ref count for objResultPtr of the interpreter.
>=20
> Does anyone know why I would have to do this? Why is the data=20
> 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.
>=20
> 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=20
> Extension as
> you can get and should work in TclBlend.
>=20
> Greg
>=20
>=20
> > -----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
>=20
>=20
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>=20