linux c 使用vfork时产生的疑问
浏览数：22 /
时间：2015年06月20日
#include<stdio.h>
#include<sys/types.h>
#include<unistd.h>
int globvar=5;
int main(){
pid_t pid;
int var=1, i;
printf("fork is diff with vfork\n");
// pid=fork();
pid=vfork();
switch(pid){
case 0:
i=3;
while(i-->0){
printf("child process is running\n");
globvar++;
var++;
sleep(1);
}
printf("child‘s globvar=%d,var=%d\n",globvar,var);
break;
default:
i=5;
while(i-->0){
printf("parent process is running\n");
globvar++;
var++;
sleep(1);
}
printf("parent‘s globvar=%d,var=%d\n",globvar,var);
exit(0);
case -1:
printf("process creation failed\n");
exit(0);
}
return 0;
}
运行结果为：
fork is diff with vfork
child process is running
child process is running
child process is running
child‘s globvar=8,var=4
parent process is running
parent process is running
parent process is running
parent process is running
parent process is running
parent‘s globvar=13,var=-1216646167
问题来了，为什么var值不是9？？？？
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