setjmp(),longjmp 例子

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author:Driver Monkey

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#include <stdio.h>

#include <setjmp.h>

#include <stdlib.h>



static jmp_buf jmpbuffer1;

static jmp_buf jmpbuffer2;



static void longjump_f1(void);

static void longjump_f2(void);



int main(void)

{

	int test_auto = 0x55;

	static int test_static = 0x55;

	volatile int test_volatile = 0x55;



	int returnv = 0;

	static int flag = 0;



	if((returnv = setjmp(jmpbuffer1)) != 0)

	{

		printf("after jump1:\n");

		printf("test_auto = 0x%x,test_static = 0x%x,test_volatile = 0x%x\n"

			    ,test_auto,test_static,test_volatile);



		printf("returnv = %d\n", returnv);

		printf("flag = %d\n", flag);

		flag = 1;

		

	}



	if((returnv = setjmp(jmpbuffer2)) != 0)

	{

		printf("after jump2:\n");

		printf("test_auto = 0x%x,test_static = 0x%x,test_volatile = 0x%x\n"

			    ,test_auto,test_static,test_volatile);



		printf("returnv = %d\n", returnv);

		printf("flag = %d\n", flag);

		flag = 2;

	}

	

	test_auto = 0xaa;

	test_static = 0xaa;

	test_volatile = 0xaa;

	

	switch(flag)

	{

		case 0:

			longjump_f1();

			break;

		case 1:

			longjump_f2();

			break;

		default:

			exit(0);

	}

	

}



void longjump_f1(void)

{

	printf("longjum_f1()++\n");

	longjmp(jmpbuffer1,30);

	printf("longjum_f1()--\n");



}



void longjump_f2(void)

{

	printf("longjum_f2()++\n");

	longjmp(jmpbuffer2,40);

	printf("longjum_f2()--\n");



}