ref: df18213ce319be83502a281cdbc590bcf59ab6e7
dir: /sys/src/9/port/edf.h/
enum {
Maxsteps = 200 * 100 * 2, /* 100 periods of 200 procs */
/* Edf.flags field */
Admitted = 0x01,
Sporadic = 0x02,
Yieldonblock = 0x04,
Sendnotes = 0x08,
Deadline = 0x10,
Yield = 0x20,
Extratime = 0x40,
Infinity = ~0ULL,
};
typedef struct Edf Edf;
struct Edf {
/* All times in µs */
/* time intervals */
long D; /* Deadline */
long Delta; /* Inherited deadline */
long T; /* period */
long C; /* Cost */
long S; /* Slice: time remaining in this period */
/* times (only low-order bits of absolute time) */
long r; /* (this) release time */
long d; /* (this) deadline */
long t; /* Start of next period, t += T at release */
long s; /* Time at which this proc was last scheduled */
/* for schedulability testing */
long testDelta;
int testtype; /* Release or Deadline */
long testtime;
Proc *testnext;
/* other */
ushort flags;
Timer;
/* Stats */
long edfused;
long extraused;
long aged;
ulong periods;
ulong missed;
};
extern Lock edftestlock; /* for atomic admitting/expelling */
#pragma varargck type "t" long
#pragma varargck type "U" uvlong
/* Interface: */
Edf* edflock(Proc*);
void edfunlock(void);