Method pop

KAligner/Pipe.h:40–59

Get data and remove it from the buffer. */

	/** Get data and remove it from the buffer. */
	std::pair<T, size_t> pop()
	{
		// block when pipe is empty and m_open, or in use.
		m_sem_out.wait();
		pthread_mutex_lock(&m_mutex_queue);

		std::pair<T, size_t> temp = remove();

		pthread_mutex_unlock(&m_mutex_queue);

		// If pipe is m_open ensure poping will allow one more push.
		// Otherwise, let next accessor know pipe is closed.
		if (temp.second)
			m_sem_in.post();
		else {
			assert(!m_open);
			m_sem_out.post();
		}
		return temp;
	}

	/** Allows a pop when the pipe is empty to signal the pipe is
	 * 	closed. */