ipc.h

进一步研究和实践操作系统中关于并发进程同步与互斥操作的一些经典问题的解法

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <sys/msg.h>
#define BUFSZ                 256
#define MAXVAL                100
#define STRSIZ                8
#define WRITERQUEST                1 //写请求标识
#define READERQUEST                2 //读请求标识
#define FINISHED         3    //读写完成标识
/*信号灯控制用的共同体*/
typedef union semuns {
      int val;
} Sem_uns;
/* 消息结构体*/
typedef struct msgbuf {
      long mtype;
      int mid;
} Msg_buf;
 key_t buff_key;
 int buff_num;
 char *buff_ptr;
 int shm_flg;
 int quest_flg;
 key_t quest_key;
 int quest_id;
 int respond_flg;
 key_t respond_key;
 int respond_id;
int get_ipc_id(char *proc_file,key_t key);
char *set_shm(key_t shm_key,int shm_num,int shm_flag);
int set_msq(key_t msq_key,int msq_flag);
int set_sem(key_t sem_key,int sem_val,int sem_flag);
int down(int sem_id);
int up(int sem_id);