text: /*
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  #ifndef BLOCKING_QUEUE_H
  #define	BLOCKING_QUEUE_H
  
  #include "queue.h"
  #include <pthread.h>
  
  #ifdef	__cplusplus
  extern "C" {
  #endif
  
  typedef struct blocking_queue {
      queue q;
      pthread_mutex_t mutex;
      pthread_cond_t cond;
      bool shut_down;
      int size;
      int max_size;
  } blocking_queue;
  
  /** Initializes list. A list must be initialized before use */
  void blocking_queue_init(blocking_queue *q);
  
  /** gets the amunt of elements in the list */
  int  blocking_queue_size(blocking_queue *q);
  
  /** adds element to the list tail */
  void blocking_queue_add(blocking_queue *q, void* data);
  
  /** removes and returns element from the list's head */
  void* blocking_queue_poll(blocking_queue *q);
  
  /** shuts the queue down - after that blocking_queue_poll returns null on empty queue without waiting */
  void blocking_queue_shutdown(blocking_queue *q);
  
  int blocking_queue_max_size(blocking_queue *q);
  
  #ifdef	__cplusplus
  }
  #endif
  
  #endif	/* BLOCKING_QUEUE_H */
  
  