source: buchla-68k/orig/lib/INCLUDE/MTDEFS.H@ 6d3de83

/*
   =============================================================================
        mtdefs.h -- mutlitasker definitions
        Version 22 -- 1988-04-14 -- D.N. Lynx Crowe
        (c) Copyright 1988 -- D.N. Lynx Crowe
        WARNING:  all of these data structures are highly ORDER DEPENDENT.
   =============================================================================
*/

/* #define      DEBUGGER        define to enable debugging in all MT code */

#define MT_NilSR        (unsigned)0x2200        /* SR value for _MT_Nil() */
#define MT_DfPri        (unsigned)0x4000        /* default task priority */

#define MTF_RDY         0x0001          /* task ready to run  (on MT_RdyQ) */
#define MTF_SWT         0x0002          /* task waiting on a semaphore */
#define MTF_RUN         0x0004          /* task running (MT_CurP) */
#define MTF_STP         0x0008          /* task to be stopped  (waiting) */

#define MTF_OCC         0x8000          /* TCB occupied */

/* 

*/

typedef long    SEM;                    /* Semaphore */

typedef struct  _mt_msg {               /* Message */

        struct  _mt_msg *next;          /* pointer to next message in queue */
        SEM     reply;                  /* reply semaphore */
        long    msize;                  /* message size */
        long    mdata;                  /* message data or pointer */
} MSG;

typedef struct  _mt_mbx {               /* Mailbox */

        SEM     mail;                   /* mail waiting semaphore */
        SEM     mutex;                  /* mutual exclusion semphore */
        MSG     *head;                  /* pointer to head of message queue */
        MSG     *tail;                  /* pointer to tail of message queue */
} MBOX;

typedef struct  _mt_tcb {               /* Task Control Block */

        struct  _mt_tcb *next;          /* pointer to next TCB in queue */
        struct  _mt_tcb *fwd;           /* pointer to next TCB in chain */
        unsigned        tid;            /* task identifier */
        unsigned        pri;            /* task priority */
        long            slice;          /* time slice */
        long            reg[16];        /* registers */
        long            sp;             /* stack pointer */
        long            pc;             /* program counter */
        unsigned        sr;             /* status register */
        unsigned        flags;          /* task status flags */
        long            tos;            /* pointer to top of stack */
} TCB;

struct  _mt_str {                       /* Multi-Tasker variable structure */

        TCB             *TCBs;          /* TCB chain pointer */
        TCB             *CurP;          /* current TCB pointer */
        TCB             *RdyQ;          /* ready queue pointer */
        unsigned        IDct;           /* TCB ID counter */
};

struct  _mt_def {                       /* Multi-Tasker interface block */

        struct _mt_str  *mtp;   /* pointer to mt_str structure */
        SEM     *FCLK;          /* pointer to SemFCLK */
        SEM     *Quit;          /* pointer to SemQuit */
        MBOX    *Vid;           /* pointer to MSG_Vid */
};