note 16828 added to function.flock

Perhaps this is showing my age, but older UNIX systems did the append style locking with a separate file. Like this: function file_lock( $filename, $mode ) { $lock = fopen( $filename . ".lock", "a" ); if (!$lock) return NULL; if (!flock( $lock, $mode )) { fclose($lock); return NULL; } return $lock; } function file_unlock( $lock ) { flock( $lock, LOCK_UN ); fclose( $lock ); } // writer $lock = file_lock( "real.file", LOCK_EX+LOCK_NB ); if ($lock) { ... file_unlock($lock); } // reader $lock = file_lock( "real.file", LOCK_SH+LOCK_NB ); if ($lock) { ... file_unlock($lock); } -- http://www.php.net/manual/en/function.flock.php http://master.php.net/manage/user-notes.php?action=edit+16828 http://master.php.net/manage/user-notes.php?action=delete+16828 http://master.php.net/manage/user-notes.php?action=reject+16828