producer.c

来自「自己编写的」· C语言 代码 · 共 52 行

#include "op.h"


int main()
{
	key_t key;
	int shmid,semid,i,j,count=10;
	char *shm;
	char msg[10] = "data";
	struct shmid_ds *buf;
	
	key = ftok("/",0);
	shmid = shmget(key,SIZE,IPC_CREAT | 0666);
	shm = (char*)shmat(shmid,0,0);
	semid = create_sem(key);

	while(count--) {
		sleep(1);
		p_empty(semid);
		sleep(1);
		p_mutex(semid);
		if((count%2) == 1){
			for(i = 0; i < 10; i++) { 
				if(shm[i] != '1') { 
					shm[i] = '1';
					break;
				}
			}
		}
		else {
			for(i = 9; i >=0 ; i--) { 
				if(shm[i] != '1') { 
					shm[i] = '1';
					break;
				}
			}
		}	
		for(i =0; i < 10; i++)
			if(shm[i] !='1')
				shm[i] ='0';
		v_mutex(semid);
		sleep(1);
		v_full(semid);
		sleep(1);
	}
	sleep(5);
	shmdt(shm);
	shmctl(shmid,IPC_RMID,buf);
	del_sem(semid);	
	return 0;
}