typedef struct Tos Tos;
typedef struct Plink Plink;
struct Tos {
	struct			/* Per process profiling */
	{
		Plink		*pp;		/* known to be 0(ptr) */
		Plink		*next;	/* known to be 4(ptr) */
		Plink		*last;
		Plink		*first;
		ulong	pid;
		ulong	what;
	} prof;
	uvlong		cyclefreq;		/* cycle clock frequency if there is one, 0 otherwise */
	vlong		kcycles;		/* cycles spent in kernel */
	vlong		pcycles;		/* cycles spent in process (kernel + user) */
	ulong		pid;			/* might as well put the pid here */
	ulong		clock;
	/* top of stack is here */
};

extern Tos *_tos;
