Hi,
I'm currently writing (or, trying to write 🙄) a lua script that will
generate the preview cache for selected images (without leaving dt to
start the external program...). Basically, it seems to work but I see
two strange things that I don't understand right now.
First, the essential parts of my script:
localfunctionstop_job( job )
 job.valid=false
end
localfunctioncreate_previews()
 job =dt.gui.create_job( "generating previews", true, stop_job )
localimages =dt.gui.action_images
fori,image inpairs(images) do
ifjob.validthen
   image:generate_cache( true, 0, 8)
   job.percent=i /#images
   dt.control.sleep( 1) -- without this, the job cannot be aborted
else
break
end
end
ifjob.validthen-- without this, dt crashes with an exception in
dt_pthread_mutex_destroy() after aborting the job
  job.valid=false
end
end
the create_previews function will be called from a registered action.
My two questions:
1. Without the sleep() I cannot stop the running job. After starting the
job, the progress bar is shown and when I hit the 'X' nothing happens
until the for loop processed all images. Then the stop_job() is called.
With the sleep the stop_job is called after processing the current image
and the job terminates as desired.
2. When I set the job.valid to false after the loop it only works as
long as the job is not terminated via the stop_job function. As this
already sets the job to invalid I guess it is already destroyed and in
the second job.valid=false dt crashes with an exception in
dt_pthread_mutex_destroy.
Both phenomena are completely understandable, but: I see a lot of
scripts that execute job.valid=false twice (when aborted) and seem to
rely on stopping without a call to sleep(). Hmmm. What I'm missing here?
I hope you can clarify this,
thanks a lot!
Christian
--
Christian Birzer
christ...@christianbirzer.de
www.ChristianBirzer.de
www.500px.com/ChristianBirzer
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www.instagram.com/birzer.christian
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