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From: qwy on 20 Jun 2008 05:54
Hi

is there any command in Tcl that makes the same effect as the
synchronize command in Java?

Thanks
From: Arjen Markus on 20 Jun 2008 06:15
On 20 jun, 11:54, qwy <charli...(a)gmail.com> wrote:
> Hi
>
> is there any command in Tcl that makes the same effect as the
> synchronize command in Java?
>
> Thanks

I guess you want to use threads? Have a look at the
thread package - http://wiki.tcl.tk/2770 for instance
or the man page on threads in a recent enough Tcl
distribution (I think it came with Tcl 8.4)

Regards,

Arjen
From: Donal K. Fellows on 20 Jun 2008 06:15
qwy wrote:
> is there any command in Tcl that makes the same effect as the
> synchronize command in Java?

Tcl uses a different threading model to Java. Normally, you use code
that runs in interpreters that are isolated from each other (except
when listening for events/messages from elsewhere) and with data that
is kept entirely within the thread. This means that there are no locks
being held, and that makes Tcl code work very nicely on multi-core
systems. When you do want shared data, you use a Thread Shared
Variable (tsv, part of the Thread package) and then the tsv::lock
command will do the equivalent of a Java synchronize.

But mostly we don't use shared data; message passing scales up better.

Donal.
From: Ron Fox on 20 Jun 2008 08:47
It is important to repeat to yourself many times when learning a new
programming language.. this language is different than the ones I
know... So I suggest for you the mantra:

TCLINJ (Tcl Is Not Java).

You need to be open to the Tcl way of doing things which may be
fundamentally different than the Java way of doing things.

I've found it to be a great mistake to learn a new programming
language by trying to make a tight mapping between the capabilities of
one language and another. That tends to blind me to the intent of the
new language, and its idiomatic patterns.

Just a thought,
just a suggestion.

RF


qwy wrote:
> Hi
>
> is there any command in Tcl that makes the same effect as the
> synchronize command in Java?
>
> Thanks


--
Ron Fox
NSCL
Michigan State University
East Lansing, MI 48824-1321
From: qwy on 20 Jun 2008 09:16
On Jun 20, 2:47 pm, Ron Fox <f...(a)nscl.msu.edu> wrote:
> It is important to repeat to yourself many times when learning a new
> programming language.. this language is different than the ones I
> know... So I suggest for you the mantra:
>
> TCLINJ  (Tcl Is Not Java).
>
> You need to be open to the Tcl way of doing things which may be
> fundamentally different than the Java way of doing things.
>
> I've found it to be a great mistake to learn a new programming
> language by trying to make a tight mapping between the capabilities of
> one language and another.  That tends to blind me to the intent of the
> new language, and its idiomatic patterns.
>
> Just a thought,
> just a suggestion.
>
> RF
>
> qwy wrote:
> > Hi
>
> > is there any command in Tcl that makes the same effect as the
> > synchronize command in Java?
>
> > Thanks
>
> --
> Ron Fox
> NSCL
> Michigan State University
> East Lansing, MI 48824-1321

I really wonder what make you write so much useless comment and take
it for granted that I am learning (new to) TclTk. The keyword Java
maybe disturb you, or am I supposed to mention another language name
instead of Java? I just want to solve a synchronisation issue in a
Tcl software.

Unfortunately, your suggestion is totally useless for me. :-(
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