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dd� Zdd � Zd d � Zd d � Zeej�ZdS )$r zjCreate a queue object with a given maximum size.
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zQueue.__init__c C s\ | j �B | jd }|dkr4|dk r*td��| j �� || _W d � n1 sN0 Y dS )a. Indicate that a formerly enqueued task is complete.
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Queue.joinc C s2 | j � | �� W d � S 1 s$0 Y dS )�9Return the approximate size of the queue (not reliable!).N�r �_qsizer# r r r �qsize\ s z Queue.qsizec C s4 | j � | �� W d � S 1 s&0 Y dS )a� Return True if the queue is empty, False otherwise (not reliable!).
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Nr& r# r r r �emptya s z Queue.emptyc C sH | j �. d| j k o | �� kn W d � S 1 s:0 Y dS )aO Return True if the queue is full, False otherwise (not reliable!).
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