ipc~

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>
#include <wait.h>
#include <unistd.h>
#include <signal.h>
#define BUFSZ                 256
#define REQUESTMONEY          30
#define PAYMONEY					31
#define CUSTOMERREQUEST       33
#define WAITINGROOM				34
#define SOFA        				35
#define CHAIR        			36
#define RECIEVEMONEY        	37
#define OVER        	38
/*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;
 int quest_flg;
 key_t quest_key;
 int quest_id;

 int respond_flg;
 key_t respond_key;
 int respond_id;

 int My_flg1;
 key_t queen_key1;
 int queen_id1;

int My_flg2;
 key_t queen_key2;
 int queen_id2;

int My_flg3;
 key_t queen_key3;
 int queen_id3;

key_t buff_key;
int buff_num;
int *buff_ptr;

key_t pput_key;
int pput_num;
int *pput_ptr;

int shm_flg;

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);