source: buchla-68k/orig/MT/MTQUIT.C@ 861ab45

/*
   =============================================================================
        mtquit.c -- Multi-Tasker -- shutdown
        Version 1 -- 1988-04-11 -- D.N. Lynx Crowe
        (c) Copyright 1988 -- D.N. Lynx Crowe
   =============================================================================
*/

#include "stddefs.h"
#include "biosdefs.h"
#include "mtdefs.h"

extern  short           _MT_Nil();      /* system NIL task */

extern  TCB             *MT_CurP;       /* current TCB pointer */
extern  TCB             *MT_RdyQ;       /* ready queue pointer */

extern  unsigned        *_MT_Vc1;       /* old swapper TRAP vector 1 */
extern  unsigned        *_MT_Vc2;       /* old swapper TRAP vector 2 */

long                    _MT_Stk[48];    /* a stack for _MT_Nil() */

TCB                     _MT_TCB;        /* dummy TCB for shutdown */

/* 

*/

/*
   =============================================================================
        MTQuit() -- shut down the multi-tasker
   =============================================================================
*/

MTQuit()
{
        register short oldipl;

        oldipl = setipl(7);             /* DISABLE INTERRUPTS */

        BIOS(B_SETV, 40, _MT_Vc1);      /* restore old trap vector 1 */
        BIOS(B_SETV, 41, _MT_Vc2);      /* restore old trap vector 2 */

        _MT_Vc1 = (short *)NIL;         /* clear trap vector save area 1 */
        _MT_Vc2 = (short *)NIL;         /* clear trap vector save area 2 */

        /* setup dummy current TCB in case of 'accidents' */

        _MT_TCB.pri   = (unsigned)0xFFFF;       /* highest priority */
        _MT_TCB.slice = -1L;                    /* no time slicing */

        MT_CurP = &_MT_TCB;             /* make dummy TCB current */
        MT_RdyQ = (TCB *)NIL;           /* clear the ready queue */

        setipl(oldipl);                 /* RESTORE INTERRUPTS */
}