Bob, Many thanks - I'll look into it.
Mark > -----Original Message----- > From: Bob Showalter [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, June 04, 2002 9:22 AM > To: 'HENRY,MARK (HP-Roseville,ex1)'; '[EMAIL PROTECTED]' > Subject: RE: avoiding 2nd process > > > > -----Original Message----- > > From: HENRY,MARK (HP-Roseville,ex1) [mailto:[EMAIL PROTECTED]] > > Sent: Tuesday, June 04, 2002 12:15 PM > > To: '[EMAIL PROTECTED]' > > Cc: HENRY,MARK (HP-Roseville,ex1) > > Subject: avoiding 2nd process > > > > > > All, > > > > Wondering what the best approach would be to the following. > > > > I have a script which copies files and sends mail notification > > appropriately. > > > > I want the script to check for new source files every 15 > > mins, however when > > there are new files, the operation will take long enough to > > the point where > > a second instance of the script will start while the first is still > > executing - obviously I don't want two copies running > simultaneously. > > My first thought would be to create a dummy file upon start > > and if this > > exists, a second instance wouldn't begin, then deleting the > > file when the > > operation is complete. > > > > Is there a better way of doing this? > > Use a lock instead of just the presence of a file. If your script dies > without removing the file, all subsequent calls are blocked until you > manually remove the file. If you use a lock, the kernel will > automatically > release when your process ends, even if it terminates abnormally. > > See: <http://www.stonehenge.com/merlyn/WebTechniques/col54.html> > -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
