note 60533 added to function.flock

Is there a way to lock a GIF/JPG file? I'd like to allow users to do this: access a 500x500px GIF file, add a dot 1x1px to a specific coordinate (they choose), see the final result. If 100 users add 100 dots at the same time, the image will be loaded, modified and saved at the same time. With a bad result (like showing some dots, but not all). ---- Manual Page -- http://www.php.net/manual/en/function.flock.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+60533 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+60533&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+60533&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+60533&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+60533&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+60533&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+60533&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+60533&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+60533&report=yes Search -- http://master.php.net/manage/user-notes.php