Linux 下C问题

进程创建函数fork与vfork

C/C++ code:

#include<stdio.h>
#include<sys/types.h>
#include<unistd.h>
int globflag=9;
main()
{
pid_t pid;
int flag=0;
int i=0;

printf("vfork is diffirent with vfork\n");

// pid=fork();
pid=vfork();
if(pid==0)
{
i=3;
while(i-- >0)
{
printf("child process is running\n");
globflag++;
flag++;
sleep(1);
}
printf("child process:globflag=%d,flag=%d\n",globflag,flag);
}
else if(pid>0)
{
i=5;
while(i-- >0)
{
printf("parents process is running\n");
globflag++;
flag++;
sleep(1);
}
printf("parents process:globflag=%d,flag=%d\n",globflag,flag);
}
else
printf("process creat fail\n");
}



运行结果：
vfork is diffirent with vfork
child process is running
child process is running
child process is running
child process:globflag=12,flag=3
parents process is running
parents process is running
parents process is running
parents process is running
parents process is running
parents process:globflag=