note 58620 added to function.flock

Well, I can claim I wrote this as a workaround for earlier versions of PHP, but in reality I just didn't think to look up flock() until after I'd written it. However, if you do happen to have an earlier version of PHP, these might come in handy. Enjoy. <?php // Lock a file, timing out if it takes too long. function lock ($lock, $tries) { $lock0 = ".{$lock}0"; $lock1 = ".{$lock}1"; for ($i=0; $i<$tries; $i++) { if (!is_file($lock0)) { touch($lock0); if (!is_file($lock1)) { touch($lock1); return 1; } } usleep(100); } return 0; } // Unlock a file. function unlock ($lock) { unlink(".{$lock}1"); unlink(".{$lock}0"); } // Usage example. $filename = "somefile"; $data = "stuff and things\n"; $tries = 10; if (lock($filename, $tries)) { $h = fopen($filename, "a") or die(); fwrite($h, $data); fclose($h); unlock($filename); } else { die("Failed to lock $filename after " . ($tries*100) . " milliseconds!"; } ?> ---- Manual Page -- http://www.php.net/manual/en/function.flock.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+58620 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+58620&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+58620&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+58620&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+58620&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+58620&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+58620&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+58620&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+58620&report=yes Search -- http://master.php.net/manage/user-notes.php