productor&consumer.txt

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#include <stdio.h>
#include <pthread.h>
#include <sys/types.h>
#include <linux/sem.h>
#include <unistd.h>

void p(int semid,int index)
{
	struct sembuf sem;
	sem.sem_num = index;
	sem.sem_op = -1;
	sem.sem_flg = 0;
	semop(semid,&sem,1);
	return;
}

void v(int semid,int index)
{
	struct sembuf sem;
	sem.sem_num = index;
	sem.sem_op =  1;
	sem.sem_flg = 0;
	semop(semid,&sem,1);
	return;
}

#define N 5
int a[N];    
int semid;     
int in,out; 

void *producer(void *arg)
{
	int i,j;
	i=5;
	while(i--)
	{
		p(semid,1);
		p(semid,0);
		a[in]=i+1;
		printf("producer %d   produce the %dth data %d  ",pthread_self(),in,a[in]);
		for(j=0;j<N;j++)
			printf("%d  ",a[in]);
		printf("\n\n");
		in=(in+1)%N;
		v(semid,0);
		v(semid,2);
		sleep(3);
	}
}

void *consumer(void *arg)
{
	int i,j,s;
	i=5;
	while(i--)
	{
		p(semid,2);
		p(semid,0);
		s=a[out];
		printf("consumer %d   consume the %dth data %d  ",pthread_self(),out,a[out]);
		a[out]=0;
		for(j=0;j<N;j++)
			printf("%d  ",a[out]);
		printf("\n\n");
		out=(out+1)%N;
		v(semid,0);
		v(semid,1);
		sleep(3);
	}
}

int main(void) 
{	union semun  semopts;
	int res,i;
    pthread_t t1[2],t2[2];

	semid = semget(300,3,IPC_CREAT|0666);   
	if (semid<0)
	{
		printf("error");
	    return;
	}

    semopts.val=1;   
	res=semctl(semid,0,SETVAL,semopts);    
    if (res<0) return;
	
	semopts.val=N; 
	res=semctl(semid,1,SETVAL,semopts);    
	if (res<0) return; 

	semopts.val=0;  
	res=semctl(semid,2,SETVAL,semopts);    
    if (res<0) return;

    for(i=0;i<2;i++)
	{
		if(pthread_create(&t1[i],NULL,producer,NULL))
			printf("error creating thread");
		
	}

    for(i=0;i<2;i++)
	{
		if(pthread_create(&t2[i],NULL,consumer,NULL))
			printf("error creating thread");
		
	}
    
	for(i=0;i<2;i++)
	{
		pthread_join(t1[i],NULL);
        pthread_join(t2[i],NULL);
	}

	semctl(semid,0,IPC_RMID,0);    
	semctl(semid,1,IPC_RMID,0);     
	semctl(semid,2,IPC_RMID,0);     
	exit(0);
}

producer 2184532116 produce the 0th data 5 5 5 5 5 5
producer 2184532117 produce the 1th data 5 5 5 5 5 5
producer 2184532118 produce the 0th data 5 0 0 0 0 0
producer 2184532119 produce the 1th data 5 0 0 0 0 0
producer 2184532120 produce the 2th data 4 4 4 4 4 4
producer 2184532121 produce the 3th data 4 4 4 4 4 4
producer 2184532122 produce the 2th data 4 0 0 0 0 0
producer 2184532123 produce the 3th data 4 0 0 0 0 0
producer 2184532124 produce the 4th data 3 3 3 3 3 3
producer 2184532125 produce the 0th data 3 3 3 3 3 3
producer 2184532126 produce the 4th data 3 0 0 0 0 0
producer 2184532127 produce the 0th data 3 0 0 0 0 0
producer 2184532128 produce the 1th data 2 2 2 2 2 2
producer 2184532129 produce the 2th data 2 2 2 2 2 2
producer 2184532130 produce the 1th data 2 0 0 0 0 0
producer 2184532131 produce the 2th data 2 0 0 0 0 0
producer 2184532132 produce the 3th data 1 1 1 1 1 1
producer 2184532133 produce the 4th data 1 1 1 1 1 1
producer 2184532134 produce the 3th data 1 0 0 0 0 0
producer 2184532135 produce the 4th data 1 0 0 0 0 0