王杰IOday8

#include 
	
int main(int argc, const char *argv[])
{
	key_t key =ftok("./05v.c",1);
	if(key<0)
	{
		ERR_MSG("ftok");
	}
	int shmid = shmget(key,32,IPC_CREAT|0664);//创建共享内存
	if(shmid<0){
		ERR_MSG("shmid");
	}
	void *addr = shmat(shmid,NULL,0);//映射到用户空间
	if((void*)-1==addr)
	{
		ERR_MSG("shmat");
	}
	int semid = semget(key,2,IPC_CREAT|0664);//创建信号灯集
	if(semid<0){
		ERR_MSG("semget");
	}
	char *p1=(char*)addr;
	strcpy(p1,"1234567");//共享内存赋值
	
	//设置信号灯集0号灯初始值
	unsigned int setval=1;
	if(semctl(semid,0,SETVAL,setval)<0)
	{
		ERR_MSG("semctl");
	}	
	struct sembuf sops[2];
	sops[0].sem_num =0;
	sops[0].sem_op = -1;//P操作
	sops[0].sem_flg = 0;

	sops[1].sem_num =1;
	sops[1].sem_op = 1;//V操作
	sops[1].sem_flg = 0;
	while(1){
		if(semop(semid,&sops[0],1)<0)
		{
			ERR_MSG("semop");
		}else{
		//	sleep(1);
			printf("%s\n",p1);
		}
		semop(semid,&sops[1],1);
	}
	return 0;
}

#include 
	
int main(int argc, const char *argv[])
{
	key_t key =ftok("./05v.c",1);
	if(key<0)
	{
		ERR_MSG("ftok");
	}
	int shmid = shmget(key,32,IPC_CREAT|0664);//创建共享内存
	if(shmid<0){
		ERR_MSG("shmid");
	}
	void *addr = shmat(shmid,NULL,0);//映射到用户空间
	if((void*)-1==addr)
	{
		ERR_MSG("shmat");
	}
	char *p1=(char*)addr;
	strcpy(p1,"1234567");

	int semid = semget(key,2,IPC_CREAT|0664);//创建信号灯集
	if(semid<0){
		ERR_MSG("semget");
	}
	struct sembuf sops[2];
	sops[0].sem_num =1;
	sops[0].sem_op = -1;//P操作
	sops[0].sem_flg = 0;

	sops[1].sem_num =0;
	sops[1].sem_op = 1;//V操作
	sops[1].sem_flg = 0;
	while(1){
			if(semop(semid,&sops[0],1)<0)
			{
				ERR_MSG("semop");
			}		
		for(int i=0;i