note 60974 deleted from function.fopen by danbrown

Note Submitter: Paul Yanchenko ---- I found a strange behaviour of PHP when several scripts trying to fopen a file for writing access simultaneously. I expect that this will result file sharing violation, but it's not and all scripts can open and write that file. I'd like to use sharing violation to control uniqueness of script instance, but now I even do know how to do this. The only idea is to use "x" flag in fopen(), but if that lock-file somehow will not be deleted - script will never run. PHP 5.0.5, Windows XP Pro SP2