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: tcljava-user-admin@[...].net 
>  [mailto:tcljava-user-admin@[...].net] On Behalf 
>  Of Pierce, Greg
>  Sent: Wednesday, February 08, 2006 2:05 PM
>  To: tcljava-user@[...].net
>  Subject: RE: [tcljava-user] Tcl Extension
>  
>  Hi Mo DeJong,
>  
>  I can get my simple Tcl Extension to work in TclBlend if I do the
>  following:
>  
>   
>     Interp *iPtr = (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: tcljava-user-admin@[...].net 
>  > [mailto:tcljava-user-admin@[...].net] On Behalf 
>  > Of Mo DeJong
>  > Sent: Monday, February 06, 2006 9:27 PM
>  > To: tcljava-user@[...].net
>  > Subject: Re: [tcljava-user] Tcl Extension
>  > 
>  > On Mon, 6 Feb 2006 13:40:10 -0700
>  > "Pierce, Greg" <Greg.Pierce@[...].com> wrote:
>  > 
>  > > Hi,
>  > >  
>  > > I'm using TclBlend within a Java application to add scripting
>  > > capabilities.
>  > >  
>  > > I have a C/C++ based Tcl Extension that I've developed and 
>  > want to use
>  > > within a Tcl_Interp. I'm able to do a 'package require' of my Tcl
>  > > Extension
>  > >  
>  > > Tcl_Interp interp;
>  > > interp.eval("package require Myext");
>  > > interp.eval("mycmd");
>  > >  
>  > > but when the extension tries to execute a Tcl C API command like
>  > > Tcl_AppendResult within 'mycmd' it
>  > > crashes with an error like:
>  > >  
>  > > alloc: invalid block: 0xb03be3e0: 1 0 0
>  > > 
>  > > Does anyone know why this is happening?
>  > >  
>  > > I've done some research on this alloc command error and 
>  > 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?
>  > 
>  > Yes, Tcl Blend needs to be used with a thread safe build of 
>  > Tcl. Your extension
>  > also needs to be built with the same version of Tcl so that 
>  > it makes use of thread
>  > safe APIs.
>  > 
>  > > Question: Why does TclBlend need to use threads?
>  > 
>  > Because Tcl Blend interacts with Java and Java is multi 
>  > threaded. This means that
>  > thread safe APIs needs to be used in all the code running in 
>  > your process. Here is
>  > a link that describes how to build Tcl and Tcl Blend so that 
>  > they are thread safe.
>  > You should try recompiling your extension with the thread 
>  > safe version of Tcl
>  > you built and see if that helps. You might also check the 
>  > CFLAGS being used
>  > when your extension is compiled to make sure the proper flags 
>  > are being passed
>  > on the compiler command line.
>  > 
>  > http://wiki.tcl.tk/9993
>  > 
>  > cheers
>  > Mo DeJong
>  > 
>  > 
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