Single Instance / Multithreading question

Hi there

I have what I believe must be a relatively simple question, but I
can't really find some help on google.

I have a single instance, Windows Form application, that takes some
arguments from a command line (some filenames) and then process these
files.

The problem is the following: when the application is launched, it
starts immediatly processing the file (so I could have used a console,
but consoles don't do single instancing). If other instances are
launched, they add the filenames to a queue through a
MyApplication_StartupNextInstance sub.

But processing the files takes time, and it seems that after a while
the "next instances" get bored of waiting for the process to be over
to execute and throw an error.

A solution I found is to launch the file processing in a separate
thread, so that the next instance can add their files to the queue at
the same time.

Where I am stuck is how can I get the process (running as a thread) to
launch when the file is processed some script that goes into the queue
and eventually re-ignite a new thread if there are still files waiting
to be processed.

If I was using a "thread.join" in the script that launches the
process, I am back to square 1, i.e. I have a non threaded sub
running, preventing new instances to add their files to the queue.

If I launch the script that launch the process from the process itself
then it's a sort of circular reference since the script wants to
terminate/start the process that runs it.

Am I missing something? Would someone know a way to get some script
running when the process is done, while not having a script listening
(and therefore preventing other scripts to run) at the same time?

thanks in advance!
Charles




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