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e�ZdS )z'A multi-producer, multi-consumer queue.� N)�deque)�heappush�heappop)� monotonic�Empty�Full�Queue�
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dd� Zdd � Zd d � Zd d � ZdS )$r zjCreate a queue object with a given maximum size.
If maxsize is <= 0, the queue size is infinite.
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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 j� || _W dQ 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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W W dQ R X dS )a� Blocks until all items in the Queue have been gotten and processed.
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queue. The count goes down whenever a consumer thread calls task_done()
to indicate the item was retrieved and all work on it is complete.
When the count of unfinished tasks drops to zero, join() unblocks.
N)r r �wait)r r r r �joinH s z
Queue.joinc C s | j �
| j� S Q R X dS )z9Return the approximate size of the queue (not reliable!).N)r �_qsize)r r r r �qsizeU s z Queue.qsizec C s | j � | j� S Q R X dS )a� Return True if the queue is empty, False otherwise (not reliable!).
This method is likely to be removed at some point. Use qsize() == 0
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.
N)r r )r r r r �emptyZ s z Queue.emptyc
C s0 | j � d| j k o | j� kS S Q R X dS )aO Return True if the queue is full, False otherwise (not reliable!).
This method is likely to be removed at some point. Use qsize() >= n
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 dQ R X dS )a Put an item into the queue.
If optional args 'block' is true and 'timeout' is None (the default),
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.
Otherwise ('block' is false), put an item on the queue if a free slot
is immediately available, else raise the Full exception ('timeout'
is ignored in that case).
r Nz''timeout' must be a non-negative numberg r ) r r r r r r �time�_putr r �notify)r �item�block�timeout�endtime� remainingr r r �puts s&
z Queue.putc C s� | j �� |s| j� s�t�nn|dkr<xd| j� s8| j j� q$W nL|dk rNtd��n:t� | }x.| j� s�|t� }|dkrxt�| j j|� qZW | j� }| jj� |S Q R X dS )a 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
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available, else raise the Empty exception ('timeout' is ignored
in that case).
Nr z''timeout' must be a non-negative numberg ) r r r r r r$ �_getr r& )r r( r) r* r+ r' 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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get_nowait� s zQueue.get_nowaitc C s t � | _d S )N)r �queue)r r r r r r � s z Queue._initc C s
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S ) r z�Variant of Queue that retrieves open entries in priority order (lowest first).
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g | _ d S )N)r1 )r r r r r r � s zPriorityQueue._initc C s
t | j�S )N)r2 r1 )r r r r r � s zPriorityQueue._qsizec C s t | j|� d S )N)r r1 )r r' r r r r% � s zPriorityQueue._putc C s
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zBVariant of Queue that retrieves most recently added entries first.c C s
g | _ d S )N)r1 )r r r r r r � s zLifoQueue._initc C s
t | j�S )N)r2 r1 )r r r r r � s zLifoQueue._qsizec C s | j j|� d S )N)r1 r3 )r r' r r r r% � s zLifoQueue._putc C s
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