plock
extern struct plock p0lock; /* p0's plock */
struct plock p0lock; /* p0's p_lock */
proc_lock = kmem_zalloc(sizeof (struct plock) * v.v_proc, KM_SLEEP);
struct plock *proc_lock; /* persistent array of p_lock's */
int plock(int);
struct plock *p_lockp; /* ptr to proc struct's mutex lock */
extern struct plock p0lock; /* p0's plock */