Subject:
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Re: flock() and <FH> in Perl
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Newsgroups:
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lugnet.off-topic.geek
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Date:
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Mon, 24 May 1999 01:30:42 GMT
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Viewed:
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72 times
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In lugnet.off-topic.geek, jsproat@geocities.com (Sproaticus) writes:
> Probably a dumb question, but I can't find the answer at the moment...
>
> I *think* I read somewhere that a flock()'ed file handle, e.g. FH,
> shouldn't be accessed using the <FH> operator. Is this something to
> worry about?
That doesn't sound right. You should be able to read a file using <FH>
whether you've flocked it with LOCK_SH or LOCK_EX. Do you remember where
you might've heard that, or whether it might've been an OS-specific warning?
> Also, can I use a FileHandle object in a call to flock()?
Hmm...what's a FileHandle object? Do you mean an IO::File object?
If so, then ===> "Use the Source, Luke!"
I think the answer should be "yes" because the IO::Handle::new constructor
(in the superclass of IO::File) calls Symbol::gensym() to generate an
anonymous typeglob which, according to 'perldoc Symbol', can be used as a
file or directory handle. This makes sense intuitively, too, because an
IO::File object is just a subclass of an IO::Handle object, which is really
nothing more than a tied typeglob, and typeglobs are how perl typically
manipulates filehandles.
HTH,
--Todd
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Message is in Reply To:
 | | flock() and <FH> in Perl
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| Probably a dumb question, but I can't find the answer at the moment... I *think* I read somewhere that a flock()'ed file handle, e.g. FH, shouldn't be accessed using the <FH> operator. Is this something to worry about? Also, can I use a FileHandle (...) (25 years ago, 20-May-99, to lugnet.off-topic.geek)
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