in reply to Calling a sub routine from an object

Is that "she ain't working" as in "Some output I'm expecting isn't appearing" or "My b**** ain't bringin' in da money" ;-)?. IOW, what exactly are you expecting to happen that isn't happening? I can see one obvious problem with your second version (you use "b" instead of "$b"), but I guess that's just a typo in the example you gave. Other than that you need to be aware that the children generated by Parallel::Forkmanager do not share state, so if you're manipulating some internal variable in one child the other children won't see the change.


A computer is a state machine. Threads are for people who can't program state machines. -- Alan Cox

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Re^2: Calling a sub routine from an object
by carric (Beadle) on Jan 05, 2006 at 17:55 UTC
    Oh, that was indeed a typo. I was trying to figure out HOW to call a sub. By not working, it doesn't run the sub. It runs the "print statement" perfectly, but the major functionality NEVER happens.
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      I can't see anything wrong with the way you're calling the sub (this doesn't really have anything to do with OO btw, the ForkManager is OO but your code just uses it normally). If you say that $a is being printed, then I suspect something is going wrong in the sub. Could you try to implement a minimum piece of real code which can be run on it's own and illustrates your problem (i.e. strip out anything that's not necessary to make it fail)? That will make it possible for us to find out what's going wrong.

      Wild stab in the dark: I think this is again just a typo, but to be sure, you have:

      if (b) {
   discover (b);

sub discover {
   do lots of repetitive stuff
}

      [download]

      Obviously "b" should be "$b" as mentioned before, but you also have a right brace missing: 

      if ($b) {
   discover ($b);
}
sub discover {
   # do lots of repetitive stuff
}

      [download]
      As I said, I guess that won't be the problem, just double-checking.

      There are ten types of people: those that understand binary and those that don't.
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        As I should have done to start with, I went back and put a little debug line in my script within the sub, and as you suspected, it's running the sub, but NOT executing all the way through like it was when I wasn't forking it with this module (pun intended). The sub is supposed to kick off several nmap scans, save the output to different files per network, etc. and it simply isn't doing it. The issue ISN'T what I thought it was.. for some reason, it appears the fork mgr runs the parts of the sub it feels like running, and chunks the rest.. I have it set to do 8 threads, and each thread should take a while, but it rips through a list of 20 networks instantly, prints them all out, and does nothing further, so I guess I gotta figure out what's different. I appreciate your help. UPDATE: Well, as it turns out, I had hosed the path to nmap in my subroutine, and Perl wasn't telling me. I'm thinking I GOTTA learn how to use the debugger.
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