Description:
------------
LOCK_NB works with LOCK_SH when file locked with LOCK_EX ONLY
LOCK_NB doe NOT work with LOCK_SH if file is locked with LOCK_SH

LOCK_NB works with LOCK_EX when file locked with LOCK_SH ONLY
LOCK_NB doe NOT work with LOCK_EX if file is locked with LOCK_EX

preferred output : LOCK_NB should work with LOCK_SH or LOCK_EX no matter what lock 
type the file is locked with


Test script:
---------------
code 1:

$x = fopen("flocktest.txt", "a"); 
if (flock($x, LOCK_SH|LOCK_EX|LOCK_NB)) { 
    print "No problems, I got the lock, now I'm going to sit on it."; 
	@fwrite($x, 'ddd');
        sleep(3); 
		
} else { 
    print "Didn't quite get the lock. Quitting now. Good night."; 
} 
fclose($x); 
	

code 2 :
$x = fopen("flocktest.txt", "rb"); 
if ($x){
	if (flock($x, LOCK_SH|LOCK_NB)) { 
    print "No problems, I got the lock, now I'm going to sit on it."; 
	@fwrite($fp, 'ddd');
        sleep(3); 
		
} else { 
    print "Didn't quite get the lock. Quitting now. Good night."; 
} 
fclose($x); 
}


if running code 1 then code 1 , lock NB is not working , if running code 1 then code 2 , lock_nb works
if running code 2 then code 2 , lock_nb does not work , if running code 2 then code 1 lock nb works .