multiple instance on Unix

[Batista, Facundo]

#- If so, you could do something like this:
#- 
#- import time
#- import os
#- waiting_for_lock = 1
#- 
#- while waiting_for_lock:
#-     try:
#-         os.mkdir('/tmp/foo')
#-         waiting_for_lock = 0
#-     except OSError:
#-         print "could not create directory"
#-         time.sleep(1)
#- #do whatever you need one and only one process to do...

If you don't have the permissions to write in /tmp this will fail.

.	Facundo
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