信号量机制实验

# include<stdio.h>
# include<signal.h>
# include<unistd.h>
main()
{ int  p1, p2;
signal(SIGINT,stop);//signal£¨£©³õʼλÖÃ
while((p1=fork())==-1);
   if(p1>0)
{ //¢Ù
while((p2=fork())= =-1);
   If(p2>0)
    { //¢Ú
      wait_mark=1;
      waiting(0);
      kill(p1,10);
      kill(p2,12);
      wait();
      wait();
      printf(¡°parent process is killed!\n¡±);
      exit(0);
    }
    else
    {
wait_mark=1;
signal(12,stop);
waiting();
lockf(1,0,0);
exit(0);
}
}