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Re^4: Ensuring only one copy of a perl script is running at a time

by polettix (Vicar)
on Dec 24, 2006 at 02:49 UTC ( #591487=note: print w/replies, xml ) Need Help??

in reply to Re^3: Ensuring only one copy of a perl script is running at a time
in thread Ensuring only one copy of a perl script is running at a time

Citing tye:
It sounds like it is time for you to update your computer science knowledge by learning about race conditions.
When a question/issue raises up, it's likely that more than one person will try to answer. This is not even a shared CPU environment: it's true concurrency. But humans tend to have personal ways of doing stuff: there's the verbose one, the one that uses only two fingers to write on the keyboard, the one that answers to the telephone... and in the end you have that many answers overlap each other, even if their times are quite different. It's like a race... a race condition :)

In this case, I'd also enhance your answer to the OP giving enough evidence of the need to use flock (and marking such a modification clearly, in order to keep the following answers "meaningful"): the fact that your personal script used flock was not entirely evident :)

perl -ple'$_=reverse' <<<ti.xittelop@oivalf

Don't fool yourself.

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[shmem]: karlgoethebier: es ist theologisch umstritten, ob jesus an christi himmelfahrt tatsächlich besoffen und mit bollerwagen zu seinem vater aufgebrochen ist
[karlgoethebier]: shmem: Ja ischweis
[karlgoethebier]: shmem: Vielleicht hat er in den Bollerwagen gebrochen?
[karlgoethebier]: shmem:Ach so. Bollerwagen ist eigentlich was für Kinder. Bei uns fahren sie mit Traktoren und Feuerwehrwagen rum...
[shmem]: karlgoethebier: here abouts people are sitting in big tents, gulp beer and ingest badly scorched chicken and sausages while (not) listening to afwul musik

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