On 10/3/07, Bob McConnell <[EMAIL PROTECTED]> wrote: > > -----Original Message----- > > From: Elizabeth Cortell [mailto:[EMAIL PROTECTED] > > Sent: Wednesday, October 03, 2007 4:48 PM > > To: beginners@perl.org > > Subject: Re: Limiting a program to a single running instance > > > > Checking for instances by grepping the output of ps tends to > > also catch instances of > > > > vi myscript.pl > > > > So that innocently editing the file on that box keeps it from > > running! Not what you have in mind, I think. > > > > I suggest (untested, but we do something like this in the office): > > Upon startup, check for the existence of a lockfile with > > agreed-upon name in some tmp directory. If it exists, exit > > immediately; otherwise create the file. Remove the file at > > end of execution or upon death of script (in the END block). > > > > I haven't thought out all the ways that could go wrong. > > Comments welcome. > > If the process crashes, it won't always remove the file. Put the Process > ID in the file, then the next run can check to see if that process is > still alive and running the same application. If not, remove the file > and continue.
Thanks. I've set this up, and it seems to be working. -- Mark Wagner -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
