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contego / home / tvault / .virtenv / lib / python2.7 / site-packages / sqlalchemy / util / queue.pyc
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‹EYc@sˆdZddlmZddlmZddlmZdddgZdefd	„ƒYZ	defd
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d„ƒYZdS(sðAn adaptation of Py2.3/2.4's Queue module which supports reentrant
behavior, using RLock instead of Lock for its mutex object.  The
Queue object is used exclusively by the sqlalchemy.pool.QueuePool
class.

This is to support the connection pool's usage of weakref callbacks to return
connections to the underlying Queue, which can in extremely
rare cases be invoked within the ``get()`` method of the Queue itself,
producing a ``put()`` inside the ``get()`` and therefore a reentrant
condition.

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„Zd„ZRS(icCsJ|j|ƒtjƒ|_tj|jƒ|_tj|jƒ|_dS(sxInitialize a queue object with a given maximum size.

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cCs*|jjƒ|jƒ}|jjƒ|S(s9Return the approximate size of the queue (not reliable!).(Rtacquiret_qsizetrelease(Rtn((sJ/home/tvault/.virtenv/lib/python2.7/site-packages/sqlalchemy/util/queue.pytqsize=s

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cCs*|jjƒ|jƒ}|jjƒ|S(sJReturn True if the queue is full, False otherwise (not
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ƒWd|jjƒXdS(sPut an item into the queue.

        If optional args `block` is True and `timeout` is None (the
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        available. If `timeout` is a positive number, it blocks at
        most `timeout` seconds and raises the ``Full`` exception if no
        free slot was available within that time.  Otherwise (`block`
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cCs|j|tƒS(s­Put an item into the queue without blocking.

        Only enqueue the item if a free slot is immediately available.
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put_nowaitzscCsý|jjƒzÛ|s.|jƒrÊt‚qÊnœ|dkr]x|jƒrY|jjƒq=Wnm|dkrxtdƒ‚ntƒ|}xB|jƒrÉ|tƒ}|dkr¶t‚n|jj|ƒqˆW|jƒ}|j	j
ƒ|SWd|jjƒXdS(sRemove and return an item from the queue.

        If optional args `block` is True and `timeout` is None (the
        default), block if necessary until an item is available. If
        `timeout` is a positive 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).
        is#'timeout' must be a positive numbergN(R
RRRRRRRt_getRR R(RR"R#R$R%R!((sJ/home/tvault/.virtenv/lib/python2.7/site-packages/sqlalchemy/util/queue.pytget‚s(


	
cCs
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