flock（）总是返回true

Question

Been over this for the last hour, and cant really figure out whats wrong.

This is the code I was using to debug the issue.

Monitor.php

$fp = fopen("lock.txt", "r+");
$var=flock($fp, LOCK_EX | LOCK_NB);
var_dump($var);
$var=flock($fp, LOCK_SH | LOCK_NB);
var_dump($var);
exit;

locker.php

$fp = fopen("lock.txt", "r+");
sleep(60);

To see if flock is working properly, I first run the locker.php, so that file will be locked for 60 seconds, and I then try running the monitor.php to see if I can get a lock.

I get TRUE for both exclusive and shared lock.

What would be the problem?

Solution : Assumed opening the file would lock it. The locker should issue an flock to lock the file.

Missed that part in the hurry. Deadlines.Deadlines :)

Answer 1

locker.php is not locking the file. fopening a file will not lock it. flock is a cooperative advisory locking system. All parties need to participate in it and use flock to lock and/or check for locks. Unless locker.php explicitly flocks the file it is not locked.