Perl, Starting a new script to run in BG

Starting a new script to run in BG

Author	Message
Brandon Pulsiphe #1 / 4	Starting a new script to run in BG I am running AS Perl on WinNT 4.0. I am hoping there is solution to my dilemma. I would like to have a webpage (Perl Script) load and when it does, spawn another process (Perl script, or subroutine) that runs in the background until it finishes. Basically, the first time each day that a certain script on my site is called up, I want it to run a maintenance script. I don't want this to run and have the user wait, however, as it could take a while. Any suggestions here? I hope I made sense. Please CC me on a response. I only get the digest. Thanks! -Brandon
Thu, 25 Jan 2001 03:00:00 GMT

Nem W Schlec #2 / 4	Starting a new script to run in BG [courtesy copy e-mailed to author(s)] Quote: > I am running AS Perl on WinNT 4.0. I am hoping there is solution >to my dilemma. I would like to have a webpage (Perl Script) load and >when it does, spawn another process (Perl script, or subroutine) that >runs in the background until it finishes. Basically, the first time >each day that a certain script on my site is called up, I want it to run >a maintenance script. I don't want this to run and have the user wait, >however, as it could take a while. > Any suggestions here? I hope I made sense. Please CC me on a >response. I only get the digest. Thanks! Can you do a fork() call on your WinNT machine? At the top of your script: $SIG{CHLD}='IGNORE'; Then wherever else in your script (probably at the end); if ( .. check time and see if it already ran today ...) { if ($child = fork()) { print STDERR scalar localtime(time), "Running cleanup (PID: $child) - should be logged in HTTP error-log file.\n"; exit(); } else { cleanup(); # or exec("cleanup.pl"); exit(); } Quote: } -- NDUS UNIX SysAdmin http://www.nodak.edu/~nem/ "Perl did the magic. I just waved the wand."
Thu, 25 Jan 2001 03:00:00 GMT

Plamen Petk #3 / 4	Starting a new script to run in BG Date: Sun, 09 Aug 1998 17:35:58 -0600 Quote: > I am running AS Perl on WinNT 4.0. I am hoping there is solution > to my dilemma. I would like to have a webpage (Perl Script) load and > when it does, spawn another process (Perl script, or subroutine) that > runs in the background until it finishes. Basically, the first time > each day that a certain script on my site is called up, I want it to run > a maintenance script. I don't want this to run and have the user wait, > however, as it could take a while. I think you shouldn't "spawn" anything. Just display the page (script does this, doesn't it?) and let the script continue and do their "daily" job. Don't forget to apply some "locking/loging" logic to prevent more then one running script(s) to try to do the same job in the same time or more than once a day. CGI script just produce an HTML output and continues. Personaly, I make my clean-up job(s) every time the script is called. For example, the expired shopping-carts are deleted (if any) at every script call. I even don't bother if another script instance is making clean-up at the same time. Let it be! However, this is a true clean-up - i.e. just deleting. If something is to be logged, modified, etc. the logic would be much more complicated. -- === PLEASE REMOVE ## FROM MY EMAIL ADDRESS! GUESS WHY :-) === Plamen Petkov http://bgbook.hypermart.net
Sat, 27 Jan 2001 03:00:00 GMT

Maurice Aubr #4 / 4	Starting a new script to run in BG Quote: >Date: Sun, 09 Aug 1998 17:35:58 -0600 >> I am running AS Perl on WinNT 4.0. I am hoping there is solution >> to my dilemma. I would like to have a webpage (Perl Script) load and >> when it does, spawn another process (Perl script, or subroutine) that >> runs in the background until it finishes. Basically, the first time >> each day that a certain script on my site is called up, I want it to run >> a maintenance script. I don't want this to run and have the user wait, >> however, as it could take a while. >I think you shouldn't "spawn" anything. Just display the page (script >does this, doesn't it?) and let the script continue and do their "daily" >job. Don't forget to apply some "locking/loging" logic to prevent more >then one running script(s) to try to do the same job in the same time or >more than once a day. >CGI script just produce an HTML output and continues. Make sure you have command buffering turned on. And realize that the server may kill processes which hang around "too long". I think spawning is cleaner, if you can do that under NT. See Randal's column on the subject: http://www.stonehenge.com/merlyn/WebTechniques/col20.html Quote: >Personaly, I make my clean-up job(s) every time the script is called. For >example, the expired shopping-carts are deleted (if any) at every script >call. I even don't bother if another script instance is making clean-up >at the same time. Let it be! However, this is a true clean-up - i.e. just >deleting. If something is to be logged, modified, etc. the logic would be >much more complicated. cron is simple, and much more efficient. -- The first condition for the establishment of perpetual peace is the general adoption of the principles of laissez-faire capitalism. - Ludwig von Mises
Sat, 27 Jan 2001 03:00:00 GMT

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