2

#include "sched.h" 
#include "pthread.h"
#include "stdio.h"
#include "stdlib.h"
#include "semaphore.h"
#include <string.h>

int producer(void *args);
int consumer(void *args);
pthread_mutex_t mutex;
sem_t product;
sem_t warehouse;

char buffer[8][4];
int bp = 0;

int main(int argc,char **argv)
{
	pthread_mutex_init(&mutex,NULL);
	sem_init(&product,0,0);
	sem_init(&warehouse,0,8);
	int clone_flag,arg,retval;
	char *stack;
	clone_flag = CLONE_VM|CLONE_SIGHAND|CLONE_FS|CLONE_FILES;
	int i;
	for(i = 0;i < 2;i++)
	{
		arg = i;
		stack = (char*)malloc(4096);
		retval = clone((void*)producer,&(stack[4095]),clone_flag,(void*)&arg);
		stack = (char*)malloc(4096);
		retval = clone((void*)consumer,&(stack[4095]),clone_flag,(void*)&arg);
		sleep(1);
	}
	exit(1);
}


int producer(void *args)
{
	int id = *((int*)args);
	int i;
	for(i = 0;i < 10;i++)
	{
		sleep(i+1);
		sem_wait(&warehouse);
		pthread_mutex_lock(&mutex);
		if(id == 0)
			strcpy(buffer[bp],"aaa");
		else
			strcpy(buffer[bp],"bbb");
		bp++;
		printf("producer %d produce %s in %d 
",id,buffer[bp-1],bp-1);
		pthread_mutex_unlock(&mutex);
		sem_post(&product);
	}
	printf("producer %d is over!
",id);

}


int consumer(void *args)
{
	int id = *((int*)args);
	int i;
	for(i = 0;i < 10;i++)
	{
		sleep(10-i);
		sem_wait(&product);
		pthread_mutex_lock(&mutex);
		bp--;
		printf("consumer %d get %s in %d 
",id,buffer[bp],bp);
		strcpy(buffer[bp],"zzz");
		pthread_mutex_unlock(&mutex);
		sem_post(&warehouse);
	}
	printf("consumer %d is over! 
",id);
}