file lock error

dbs has asked for the wisdom of the Perl Monks concerning the following question:

Dear Monks, I am opening a few files like this:

use FileHandle;
usr Fcntl;
my $RLOG      = new FileHandle "+>> $runlog";
my $MLOG            = new FileHandle "+>> $mksysblog";

flock($RLOG, O_NONBLOCK) || warn "no NB lock $!";
flock($MLOG, O_NONBLOCK) || warn "no NB lock $!";
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But I keep getting this error: error: can not lock open: (1) my code giving this error is:

if ( scalar @_ == 1 ) {
        my $roll1 = @_;
        my $rollog1 = new Logfile::Rotate(
           File     => $roll1,
           Count    => 15,
           Dir      => $dir,
           Gzip     => $gzip,
           Flock    => 'yes',
           Persist  => 'yes'
        );
        $rollog1->rotate();
}
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plz help! thx!

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