SPUG: Does -i invocation lock files? was Re: Does tie()...

[ced at carios2.ca.boeing.com]

At 09:49 14/06/00 -0700, Tim Maher/CONSULTIX wrote:
>I'm teaching my "Intermediate Perl" class this week, and some questions
>about file-locking have arisen.  I could probably find the answers myself by
>reading some source code, but I'd rather spend my time helping my students
>on their lab assignments instead, so I thought I'd ask if anybody knows
>the answers:
>
>	1) Does the -i invocation option lock the files it processes?
>	(Seems like it should, but if it does, that's not documented!)


The Camel shows the following equivalence:


-i.bak    --->  rename($ARGV, $ARGV . '.bak';
                open(ARGVOUT, ">$ARGV");



So I don't believe there's any C<flock>. I just tried the 
following and the second process has no problem getting an 
exclusive lock: 

process 1:   perl -pi.bak -e 'sleep 60' /tmp/tmp

process 2:   perl -e 'open(F,">/tmp/tmp") or die $!; flock F,2 or die $!'



Rgds,
--
Charles DeRykus

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