Hi,
I use the script-fu-server and came across this remark at
http://people.westminstercollege.edu/students/d-b1649/linux/gimp_server.html
quote
Adding a Queue
Because the Gimp was not originally designed as a server, it does not follow
some conventions that are necessary for such a mode. This includes the issue of
managing shared resources among different threads of execution. A few of the
resources that are not 'thread-safe' include the current foreground/background
color and brush shape.
An example of the severity of this problem is if you are running two Perl
scripts at once on the same Gimp server. Let's say that the first script needs
to write some white text on a black background, and the second one needs to
write black text on a white background. Because the two are running at the same
time, the following sequence of events may occur:
1. #1 sets the foreground color to white.
2. #2 sets the foreground color to black.
3. #1 writes some text to its black image, using the current foreground
color (which is now black.)
4. #2 writes some text to its white image, using the current foreground
color (still black.)
Obviously, script #1 ends up with an image that has the incorrect color of
text. The solution to this problem is to only allow the Gimp server to run one
script at a time. This is easier said than done, especially if you have
multiple scripts that run every few minutes. What you need to do is create a
queue system that maintains a list of scripts that need to be run and have a
separate program feed them into the Gimp, one by one. When a script wants to
run, it is submitted to the queue and waits for its turn. This kind of system
is almost identical to print queues, where multiple computers share one
printer.
/quote
On the other hand I took a look at the gimp sources and it seems there is some
kind of queuing mechanism build inside gimp.
I have also read the post
http://marc.theaimsgroup.com/?l=gimp-developerm=103142913407902w=2; about
queuing (for perl-fu, but I guess it's the same for script-fu)
From this post it seems that I can safely sent multiple concurrent requests to
the script-fu-server (apart the problem of memory consumption raised by the
initial poster of that thread).
What is the reality in this regard? Do I have to build my own queue or is it
handled by gimp.
I use v 1.2.3 but plan to upgrade to gimp 2.0. Is there a difference in that
respect between the two versions?
Thanks.
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