C语言函数—eof

函数名

enable

功 能

开放硬件中断

用 法

void enable(void);

程序例

/* ** NOTE: 
This is an interrupt service routine. You can NOT compile this program 
with Test Stack Overflow turned on and get an executable file which will 
operate correctly. 
*/ 

#include <stdio.h> 
#include <dos.h> 
#include <conio.h> 

/* The clock tick interrupt */ 
#define INTR 0X1C 

void interrupt ( *oldhandler)(void); 

int count=0; 

void interrupt handler(void) 
{ 
/* 
   disable interrupts during the handling of the interrupt 
*/ 
   disable(); 
/* increase the global counter */ 
   count++; 
/* 
   re enable interrupts at the end of the handler 
*/ 
   enable(); 
/* call the old routine */ 
   oldhandler(); 
} 

int main(void) 
{ 
/* save the old interrupt vector */ 
   oldhandler = getvect(INTR); 

/* install the new interrupt handler */ 
   setvect(INTR, handler); 

/* loop until the counter exceeds 20 */ 
   while (count < 20) 
      printf("count is %dn",count); 

/* reset the old interrupt handler */ 
   setvect(INTR, oldhandler); 

   return 0; 
} 
  
  

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