* hence by iteself does not indicate no value. */
#define VALUE_NONE 0xdeadbeef
-/** A special value to represent a successful trylock */
-#define VALUE_TRYSUCCESS 1
-
-/** A special value to represent a failed trylock */
-#define VALUE_TRYFAILED 0
-
/** @brief Represents an action type, identifying one of several types of
* ModelAction */
typedef enum action_type {