Ben Cantrick (mackys) wrote,
Ben Cantrick

  • Mood:
  • Music:

Ensuring garbage collection of objects in perl.

Perl's garbage collector counts references. When the count reaches zero (which means that no one has a reference), Perl reclaims the entity. The approach is simple and effective. However, circular references (when object A has a reference to object B, and object B has a reference to object A) present a problem. Even if nothing else in the program has a reference to either A or B, the reference count can never reach zero. Objects A and B do not get destroyed. If the code creates them again and again (perhaps in a loop), you get a memory leak. The amount of memory allocated by the program increases without a sensible reason and can never decrease. This effect may be acceptable for simple run-and-exit scripts, but it's not acceptable for programs running 24x365, such as in a mod_perl or FastCGI environment or as standalone servers.
Tags: perl, programming, reddit
  • Post a new comment


    default userpic

    Your reply will be screened

    Your IP address will be recorded 

    When you submit the form an invisible reCAPTCHA check will be performed.
    You must follow the Privacy Policy and Google Terms of use.