Am Wed, 22 Jun 2005 23:49:21 -0700 schrieb Ali: > Hi, > > I have a script which I double-click to run. If i double-click it > again, it will launch another instance of the script. > > Is there a way to allow only one instance of a script, so that if > another instance of the script is launched, it will just return with an > error.
Hi, Create a file which contains the PID (process ID) of the current process in a directory. If the file already exists, the file is running. If your script dies without removing the pid-file, you need to look during the start if the PID which is in the file is sill alive. There is a small race condition between os.path.exists() and writing the file. If you want to be 100% sure you need to use file locking. HTH, Thomas -- Thomas Güttler, http://www.thomas-guettler.de/ -- http://mail.python.org/mailman/listinfo/python-list
