process.h

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#ifndef NPROC
#define NPROC 8
#endif

#define PR_FREE 0
#define PR_CURR 1
#define PR_READY 2
#define PR_RECV 3
#define PR_SLEEP 4
#define PR_SUSP 5
#define PR_WAIT 6
#define PR_RECTIM 7

#define PNMLEN 16
#define NULLPROC 0

#define INITSTK 65536
#define INITPRIO 20
#define INITRET userret

#define isbadpid(x) (((pid32)(x) < 0) ||      \
                     ((pid32)(x) >= NPROC) || \
                     (proctab[(x)].prstate == PR_FREE))

#define NDESC 5 /* must be odd to make procent 4N bytes */

struct procent
{
    uint16 prstate;
    pri16 prprio;
    char *prstkptr;
    char *prstkbase;
    uint32 prstklen;
    char prname[PNMLEN];
    sid32 prsem;
    pid32 prparent;
    umsg32 prmsg;
    bool8 prhasmsg;
    int16 prdesc[NDESC];
};

#define STACKMAGIC 0x0A0AAAA9

extern struct procent proctab[];
extern int32 prcount;
extern pid32 currpid;