现在把程序修改了，可还是不能正常工作，希望各位帮我看看。msn:yaly163@hotmail.com EXTRN _task1:word
extrn _l:byte
extrn _task_ss:word
extrn _change:far
PUBLIC _OSTickISR
PUBLIC _OSStartHighRdy
PUBLIC _OSStartSample
PUBLIC _sample
public _OSSw
.MODEL SMALL
.CODE
.186
;================================================================;
_OSSw proc far
PUSHA ;Save current task's context
PUSH ES
POP ES
POPA
iret
_OSSw endp
;=============================================================;
_OSTickISR PROC far
pusha
push es
mov ax,seg (_task1)
mov ds,ax
call _change
mov bx,offset (_task1)
mov ss,
pop es
popa
iret
_OSTickISR ENDP
;================================================================;
_OSStartHighRdy proc NEAR
MOV AX, SEG(_task1)
MOV DS, AX
mov bx, offset _task1
mov sp,
mov ax, ds
mov ss, ax
popa
pop es
iret
_OSStartHighRdy ENDP
;================================================================;
_sample proc far
add sp,10
mov ax, seg (_task1)
mov ds, ax
mov bx, offset _task1
mov sp,
mov ss, ax
pop es
popa
; call _OSStartSample
iret
endp
_OSStartSample proc near
mov ax, seg (_task1)
mov ds, ax
mov bx, offset _task1
ret
endpWRITE_CHAR PROC
MOV AH,2h
INT 21h
RET
WRITE_CHAR ENDP
end#include <dos.h>
#include <stdio.h>
#include <conio.h>
unsigned int task_ss;
unsigned int task1;
int m=0;
int n=0;
int l=0;void far OSSw();
void far sample();
void far OSTickISR();
void far OSStartHighRdy();
void far OSStartSample();
void far change()
{
// sample();
if(!l)
{
l=1;
task1=(unsigned int )FP_OFF(&task_ss);
}
else
{
l=0;
task1=(unsigned int )FP_OFF(&task_ss); }
sample();
}
void far os_task1()
{
// int m=0;
// m++;
while(1)
{ printf("this is a task1 \n"<img src="images/smilies/face-wink.png" align="absmiddle" border="0">;
// getchar();
// OSStartSample();
}
}
void far os_task2()
{
// int n=0;
// n++;
while(1)
{
printf("this is a task2 \n"<img src="images/smilies/face-wink.png" align="absmiddle" border="0">;
// OSStartSample();
}
}
void main(void)
{
// memset(task_ss,0x0000,sizeof(unsigned int)*1024);
task_ss=(unsigned int)FP_OFF(&os_task1);
task_ss=(unsigned int)FP_SEG(&os_task1);
task_ss=0x0200; task1=(unsigned int )FP_OFF(&task_ss); task_ss=(unsigned int)FP_OFF(&os_task2);
task_ss=(unsigned int)FP_SEG(&os_task2);
task_ss=0x0200;
task1=(unsigned int)FP_OFF(&task_ss);
setvect(0xf0,(void interrupt (*)(void))OSSw);
setvect(0x1c,(void interrupt (*)(void))OSTickISR);
OSStartHighRdy();
while(1)
{
printf("this is a test\n"<img src="images/smilies/face-wink.png" align="absmiddle" border="0">;
}}
