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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.
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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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N)r r �wait�r r r r �joinN s z
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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.
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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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as a direct substitute, but be aware that either approach risks a race
condition where a queue can shrink before the result of full() or
qsize() can be used.
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� W 5 Q R X dS )a Put an item into the queue.
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block if necessary until a free slot is available. If 'timeout' is
a non-negative number, it blocks at most 'timeout' seconds and raises
the Full exception if no free slot was available within that time.
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is immediately available, else raise the Full exception ('timeout'
is ignored in that case).
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C s� | j �� |s| �� s�t�nf|dkr8| �� s�| j �� q"nH|dk rJtd��n6t� | }| �� s�|t� }|dkrrt�| j �|� qT| �� }| j�� |W 5 Q R � S Q R X dS )� Remove and return an item from the queue.
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block if necessary until an item is available. If 'timeout' is
a non-negative number, it blocks at most 'timeout' seconds and raises
the Empty exception if no item was available within that time.
Otherwise ('block' is false), return an item if one is immediately
available, else raise the Empty exception ('timeout' is ignored
in that case).
Nr r+ r, ) r r' r r" r r- �_getr r/ )r r1 r2 r3 r4 r0 r r r �get� s$
z Queue.getc C s | j |dd�S )z�Put an item into the queue without blocking.
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put_nowait� s zQueue.put_nowaitc C s | j dd�S �z�Remove and return an item from the queue without blocking.
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raise the Empty exception.
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get_nowait� s zQueue.get_nowaitc C s t � | _d S �N)r �queuer r r r r � s z Queue._initc C s
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z�Variant of Queue that retrieves open entries in priority order (lowest first).
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t | j�S r@ rB r# r r r r' � s zPriorityQueue._qsizec C s t | j|� d S r@ )r rA r; r r r r. � s zPriorityQueue._putc C s
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S ) r zBVariant of Queue that retrieves most recently added entries first.c C s
g | _ d S r@ rG r r r r r � s zLifoQueue._initc C s
t | j�S r@ rB r# r r r r' � s zLifoQueue._qsizec C s | j �|� d S r@ rD r; r r r r. � s zLifoQueue._putc C s
| j �� S r@ )rA �popr# r r r r7 � s zLifoQueue._getNrH r r r r r � s
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dS )�_PySimpleQueuezYSimple, unbounded FIFO queue.
This pure Python implementation is not reentrant.
c C s t � | _t�d�| _d S r )r �_queuer Z Semaphore�_countr# r r r r s z_PySimpleQueue.__init__TNc C s | j �|� | j�� dS )z�Put the item on the queue.
The optional 'block' and 'timeout' arguments are ignored, as this method
never blocks. They are provided for compatibility with the Queue class.
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z_PySimpleQueue.getc C s | j |dd�S )z�Put an item into the queue without blocking.
This is exactly equivalent to `put(item)` and is only provided
for compatibility with the Queue class.
Fr9 r: r; r r r r< ' s z_PySimpleQueue.put_nowaitc C s | j dd�S r= r> r# r r r r? / s z_PySimpleQueue.get_nowaitc C s t | j�dkS )zCReturn True if the queue is empty, False otherwise (not reliable!).r �rC rK r# r r r r) 7 s z_PySimpleQueue.emptyc C s
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