56 	struct 	lock_descriptor	*from_vertex;	/* edge emanating from lock */
57 	struct 	lock_descriptor	*to_vertex;	/* edge pointing to lock */
62 struct lock_descriptor {  struct
63 	struct	lock_descriptor	*l_next;	/* next active/sleep lock */  argument
64 	struct	lock_descriptor	*l_prev;	/* previous active/sleep lock */  argument
66 	struct	lock_descriptor	*l_stack;	/* for stack operations */  argument
67 	struct	lock_descriptor	*l_stack1;	/* for stack operations */  argument
68 	struct 	lock_descriptor *l_dstack;	/* stack for debug functions */  argument
88 typedef struct 	lock_descriptor	lock_descriptor_t;  argument
97 	struct	lock_descriptor	active_locks;
98 	struct	lock_descriptor	sleeping_locks;