note 45897 deleted from function.flock by danbrown
| From: | danbrown@php.net | Date: | Mon, 18 May 2009 00:44:38 +0000 |
| Subject: | note 45897 deleted from function.flock by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-155422@lists.php.net to get a copy of this message | ||
Note Submitter: chuck
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Creating lock files and testing for their existence is absolutely wrong, NFS or not. The only file
operations that are guaranteed to be atomic are mkdir() and symlink(). And those aren't atomic
over NFS (or other network filesystems) either.
Short answer: create lock directories, not files. Don't stat the directory to test, simply try
to create it and see if it fails. And all locking bets are always off with NFS.