Again, thank you for many postings to my question.
I have reviewed solutions provided.
Well, I like the named Mutex solution under Windows.
That is a clean and straight-forward approach to the challenge.
(I cannot believe that I'm saying good thing about Windows ;-) )
Unfortunately, I'm living in Unix realm ;-)
None of solutions for Unix are appealing to me.
But they must be "the" solution for the challenge as well-established
software uses those solutions.
Now, I'm wondering.
As my program is a GUI (Tkinter) software.
Is it possible to set a known value to X11 or Tk property through
Tkinter so that another instance of the program can check if such
property is set?
Of course, I know this scheme has a flaw. If one instance uses another
logical display, then such property is probably not shared.
But for my usage, it is logically possible but not likely.
I checked my Tkinter book and found the following function.
winfo_interps(displayof=0)
This returns a list of all Tk-based applications currently running on
the display.
When I tried, I got the following:
>>> root.winfo_interps()
('tk #3', 'tk #2', 'tk')
But I couldn't find a way to set a specific name to the Tcl
interpreter.
As I'm not an expert of Tcl/Tk and X11, I probably overlooked other
functions that may do what I need.
Any comments, suggestions on this?
Maybe this can provide a platform independent way to ensure that only
single instance is running.
Thank you for your attention.
Best reagrds,
Aki Niimura
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