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#include<stdio.h>
#include<stdlib.h>
#include<pthread.h>
#include<unistd.h>
#include<sys/wait.h>

typedef struct _list
{
    struct _list *next;
    int _val;
}product_list;

product_list *head = NULL;
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t need_product = PTHREAD_COND_INITIALIZER;

void Init_list(product_list* list)
{
    if(list != NULL)
    {
        list -> next = NULL;
        list -> _val = 0;
    }
}

void* Consumer(void* _val)
{
    product_list *p = NULL;
    for(;;)
    {
        pthread_mutex_lock(&lock);
        while(head == NULL)
        {
            pthread_cond_wait(&need_product,&lock);
        }
        p = head;
        head = head -> next;
        p -> next = NULL;
        pthread_mutex_unlock(&lock);
        printf("Consum success,val is:%d\n",p -> _val);
        free(p);
    }
    return NULL;
}

void* Product(void* _val)
{
    for(;;)
    {
        sleep(rand() % 2);
        product_list* p =malloc(sizeof(product_list));
        pthread_mutex_lock(&lock);
        Init_list(p);
        p -> _val = rand() % 1000;
        p -> next = head;
        head = p;
        pthread_mutex_unlock(&lock);
        printf("Call consumer! Product has producted,val is:%d\n",p->_val);
        pthread_cond_signal(&need_product);
    }
}

int main()
{
    pthread_t t_product;
    pthread_t t_consumer;
    pthread_create(&t_product,NULL,Product,NULL);
    pthread_create(&t_consumer,NULL,Consumer,NULL);

    pthread_join(t_product,NULL);
    pthread_join(t_consumer,NULL);
    return 0;
}