Penguin

Mutex is a contraction, an abbreviation of Mutually Exclusive. Mostly used in reference to synchronized application code that only allows one particular type of operation to be performed at any one time. For example, in a MultiThreaded environment such as a GUI, the Thread? that performs the GUI repaint will have a specific type of Mutex activity.

lib/main.php:944: Notice: PageInfo: Cannot find action page

lib/main.php:839: Notice: PageInfo: Unknown action