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Home: Perl Programming Help: Advanced: Spawning Child Process in Multiple Environments: Edit Log

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Aug 20, 2002, 8:12 AM

Views: 3378
Spawning Child Process in Multiple Environments

I have a web based application that does some extensive searches and data
manipulation that can take a long time to process. Most web servers timeout if
I try to complete the whole process in one chunk.

What I would like to do is pass the search criteria to the CGI program from the
web based form and then do the following:

If the process is simple (single record search or changing user preferences only)

The application will change the preferences or start search program that
creates a results file for the single record search. The search program
will be the same program that is used for multiple record searches. The
main program will sleep for 10 seconds to allow the time for a single record search to complete. If the file is created in that ten seconds, the main program will immediately post the results. Otherwise, the main program will display a 'Search in Progress' message and recall the main program after 6 seconds. If the file is done, It will display the results. Otherwise, the process repeats until the file is done or more than $x number of minutes have elapsed. If $x minutes is passed, an message will be displayed to contact the system admin to check for errors.

If the process is an intensive search

The application will behave exactly as above, but will never have the
processing complete after the initial 10 second sleep.

The problem is this. If I use exec() or system() to call the program that will
do the search, the main application still waits to display output until the called
child process completes.

What I need is complete disassociation of the called process. I need to start
the search from the main program and display whatever output is required without
waiting for that search to complete.

Does anyone have an idea how to do this? I really need help getting this done.
I have to demo this program to it's users tomorrow afternoon. Any assistance
or contribution of ideas would be greatly appreciated. Please post any
suggestions that you think could viably solve the problem, no matter how far
fetched you think they may be. I am DESPERATE!!!!! Crazy

Thanks In Advance,

print unpack"u*",pack "h*",$a,"\n\n";

(This post was edited by fashimpaur on Aug 20, 2002, 8:14 AM)

Edit Log:
Post edited by fashimpaur (User) on Aug 20, 2002, 8:14 AM

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