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dd� Zdd � Zd d � Zd d � ZdS )$r zjCreate a queue object with a given maximum size.
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�maxsize�_init� threadingZLock�mutexZ Condition� not_empty�not_full�all_tasks_done�unfinished_tasks��selfr r r r �__init__! s
zQueue.__init__c C sH | j �8 | jd }|dkr4|dk r*td��| j �� || _W 5 Q R X dS )a. Indicate that a formerly enqueued task is complete.
Used by Queue consumer threads. For each get() used to fetch a task,
a subsequent call to task_done() tells the queue that the processing
on the task is complete.
If a join() is currently blocking, it will resume when all items
have been processed (meaning that a task_done() call was received
for every item that had been put() into the queue).
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placed in the queue.
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queue. The count goes down whenever a consumer thread calls task_done()
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When the count of unfinished tasks drops to zero, join() unblocks.
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C s& | j � | �� W 5 Q R � S Q R X dS )�9Return the approximate size of the queue (not reliable!).N�r �_qsizer# r r r �qsize[ s z Queue.qsizec
C s( | j � | �� W 5 Q R � S Q R X dS )a� Return True if the queue is empty, False otherwise (not reliable!).
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as a direct substitute, but be aware that either approach risks a race
condition where a queue can grow before the result of empty() or
qsize() can be used.
To create code that needs to wait for all queued tasks to be
completed, the preferred technique is to use the join() method.
Nr& r# r r r �empty` s z Queue.emptyc
C s< | j �, d| j k o | �� kn W 5 Q R � S Q R X dS )aO Return True if the queue is full, False otherwise (not reliable!).
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condition where a queue can shrink before the result of full() or
qsize() can be used.
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