perlfunc:flock says:

flock FILEHANDLE,OPERATION
Calls flock(2), or an emulation of it, on FILEHANDLE.
Admittedly, I've never tried to flock anything other than a filehandle related to a physical file, however to be picky: flock _does_ work against filehandles.

If the information in this post is inaccurate, or just plain wrong, don't just downvote - please post explaining what's wrong.
That way everyone learns.

In reply to Re: Re: open FH, "|foo" under modperl2 by BazB
in thread open FH, "|foo" under modperl2 by tofu

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