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dd� �Zdd� Zdd � Zd d � Zd d � Zd!d"� Zd#d$� Zd%d&� Zd'd(� ZdS )*r a A queue, useful for coordinating producer and consumer coroutines.
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zQueue.get_nowaitc C s8 | j dkrtd��| j d8 _ | j dkr4| j�� dS )a$ Indicate that a formerly enqueued task is complete.
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