I have a banner impression counter.
But when I try to lock the counter file the script doesn't work. What I am doing wrong?

use Fcntl qw(:flock);  # import LOCK_* constants

if ( -e $file_banner)
{
    open(COUNT,"$file_banner") || die print "Could not open for read";
#    flock(COUNT,LOCK_EX) || die print "Could not lock";
    $line = <COUNT>;
#    flock(COUNT,LOCK_UN) || die print "Could not unlock";
    close(COUNT);
    
    print "a:$line";
    $line++;
    print "b:$line";

    open(COUNT,"+< $file_banner") || die print "Could not open for wri
+te";
#    flock(COUNT,LOCK_EX) || die print "Could not lock";
    print COUNT "$line";
#    flock(COUNT,LOCK_UN) || die print "Could not unlock";
    close(COUNT);
}
else
{
    open(NEW,"> $file_banner");
    print NEW "0";
    close(NEW);
    print "ffff\n\n";
}
exit;
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