Re: [Tcl-Threads] Shared object

[Zoran V. <zo...@ar...>]

On Wednesday 16 July 2003 20:55, you wrote:
> Example:
>
> class Auto {
>     variable _color ""
>
>     public method setColor {color} {set _color $color}
>     public method getColor {} {return $_color}
>
>     public proc new {} {return [Auto ::#auto]}
> }
>
> set audi [Auto::new]
> $audi setColor red
>
> Can i share audi variable (object)?
>

Now, we're gettting closer....
And the answer is: no.

Rationale....

Tcl uses the compartment threading model where all 
resources created by Tcl in an Tcl interpreter are always
bound to that interpreter. Examples are: channles, commands,
namespaces, etc. Now, since Tcl interps are bound to a thread
that created them, you can not share mentioned Tcl resources.

The only way one could achieve this would be to write the object
serializer which synthetizes a Tcl script representing the object
and then pass this script to the remote thread to re-create 
the object. That is, some kind of object marshalling would be needed.

I know you wont't be very happy with the answer. I'm not either.
But out of my experience (I use XOTcl instead of incrTcl)
I'm able to work-arround this limitation quite successfully and 
have written quite a complicated MT-application using OO 
constructs and threads.

Zoran