#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct dumbQueue *msgQueue;

struct dumbQueue* dumbQueue_create (void);
            void  dumbQueue_push   (struct dumbQueue *q, void *element);
            void* dumbQueue_pop    (struct dumbQueue *q);
             int  dumbQueue_isEmpty(struct dumbQueue *q);

pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t  cv  = PTHREAD_COND_INITIALIZER;

_Thread_local char *msg;

void producer(void) {
    while (1) {
        msg = malloc(255);
        scanf("%*[\n]");
        scanf("%254[^\n]", msg);
        {
            pthread_mutex_lock(&mtx);
            dumbQueue_push(msgQueue, msg);
            pthread_cond_signal(&cv);
            pthread_mutex_unlock(&mtx);
        }
    }
}

void *consumer(void *_) {
    while (1) {
        {
            pthread_mutex_lock(&mtx);
            while (dumbQueue_isEmpty(msgQueue))
                pthread_cond_wait(&cv, &mtx);
            msg = dumbQueue_pop(msgQueue);
            pthread_mutex_unlock(&mtx);
        }
        printf("%s\n", msg);
        free(msg);
    }
}

int main(void) {
    msgQueue = dumbQueue_create();
    pthread_t tid;
    pthread_create(&tid, NULL, consumer, NULL);
    producer();
}

/*****/  struct dumbQueue {
/* T */      struct dumbQueue_e {
/* h */          void *element;
/* i */          struct dumbQueue_e *next;
/* s */      } *head, *tail;
/*   */  };
/* i */  
/* s */  struct dumbQueue *dumbQueue_create(void) {
/*   */      struct dumbQueue *q = malloc(sizeof(struct dumbQueue));
/* j */      q->head = malloc(sizeof(struct dumbQueue_e));
/* u */      q->head->next = NULL;
/* s */      q->tail = q->head;
/* t */      return q;
/*   */  }
/* a */  
/*   */  void dumbQueue_push(struct dumbQueue *q, void *element) {
/* d */      q->tail->next = malloc(sizeof(struct dumbQueue_e));
/* u */      q->tail = q->tail->next;
/* m */      q->tail->next = NULL;
/* b */      q->tail->element = element;
/*   */  }
/* q */  
/* u */  void *dumbQueue_pop(struct dumbQueue *q) {
/* e */      struct dumbQueue_e *next = q->head->next;
/* u */      free(q->head);
/* e */      q->head = next;
/*   */      return q->head->element;
/* i */  }
/* m */  
/* p */  int dumbQueue_isEmpty(struct dumbQueue *q) {
/* l */      return q->head->next == NULL;
/*****/  }