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enum {
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	Maxsteps = 200 * 100 * 2,	/* 100 periods of 200 procs */
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	/* Edf.flags field */
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	Admitted		= 0x01,
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	Sporadic		= 0x02,
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	Yieldonblock		= 0x04,
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	Sendnotes		= 0x08,
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	Deadline		= 0x10,
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	Yield			= 0x20,
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	Extratime		= 0x40,
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	Infinity = ~0ULL,
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};
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typedef struct Edf		Edf;
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struct Edf {
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	/* All times in µs */
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	/* time intervals */
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	long		D;		/* Deadline */
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	long		Delta;		/* Inherited deadline */
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	long		T;		/* period */
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	long		C;		/* Cost */
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	long		S;		/* Slice: time remaining in this period */
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	/* times (only low-order bits of absolute time) */
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	long		r;		/* (this) release time */
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	long		d;		/* (this) deadline */
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	long		t;		/* Start of next period, t += T at release */
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	long		s;		/* Time at which this proc was last scheduled */
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	/* for schedulability testing */
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	long		testDelta;
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	int		testtype;	/* Release or Deadline */
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	long		testtime;
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	Proc		*testnext;
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	/* other */
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	ushort		flags;
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	Timer;
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	/* Stats */
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	long		edfused;
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	long		extraused;
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	long		aged;
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	ulong		periods;
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	ulong		missed;
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};
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extern Lock	edftestlock;	/* for atomic admitting/expelling */
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#pragma	varargck	type	"t"		long
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#pragma	varargck	type	"U"		uvlong
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/* Interface: */
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Edf*		edflock(Proc*);
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void		edfunlock(void);