test13.h

进程间调度

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <time.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/shm.h>

#define SEM_KEY   2220
#define SHM1_KEY  2221
#define SHM2_KEY  2222
#define SHM3_KEY  2223

struct PInfo
{
 int  pid;                /*进程id*/
 char pstatus;            /*进程状态*/
};
union semun
{
 int  val;                 
 struct  semid_ds *buf;
 ushort  *array;
};