| 词条 | enable |
| 释义 | § 解释 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 %d\",count); /* reset the old interrupt handler */ setvect(INTR, oldhandler); return 0; } |
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