typedef struct List{
        struct List *next;
        int val;
} *Liste;

Liste li;
pthread_mutex_t mut;

void *consume(void *p){
  
  int ret;
  Liste temp;

  while(any){
    ret=pthread_mutex_lock(&mut);
    if(li!=NULL){
      temp=li->next;
      free(li);
      li=temp;
    }
    ret=pthread_mutex_unlock(&mut);
  }
  
}

void *produce(void *p){
  
  int ret;
  Liste temp;
  
  while(any){
    ret=pthread_mutex_lock(&mut);
    
    temp=malloc(sizeof(struct List));
    temp->next=li;
    temp->val=1;
    li->next=temp;
  
    ret=pthread_mutex_unlock(&mut);
  }
}

int main(){

  pthread_t th1;
  pthread_t th2;

  int ret;

  ret=pthread_mutex_init(&mut,NULL);
 
  ret=pthread_create(&th1,NULL,consume,NULL);
  ret=pthread_create(&th2,NULL,produce,NULL);

  ret=pthread_join(th1,NULL);
  ret=pthread_join(th2,NULL);
 

}