setjmp(),longjmp 例子

 

#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");

}