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� Z# d S).z0Support for tasks, coroutines and the scheduler.�Task�FIRST_COMPLETED�FIRST_EXCEPTION�
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d � Z d d d d � Z d d d d d d � Z d d � Z d � f d d � Z d d � Z � S)r z A coroutine wrapped in a Future.TNc C s( | d k r t j � } | j j | � S)z�Return the currently running task in an event loop or None.
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} q� W| S)a� Return the list of stack frames for this task's coroutine.
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zTask.print_stackc C sH d | _ | j � r d S| j d k r; | j j � r; d Sd | _ d S)a� Request that this task cancel itself.
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raise a different exception.
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� � � f d d � t | � D� } t | | | � � Ed HS)a� Wait for the Futures and coroutines given by fs to complete.
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� r� | j � S| j | � | j � t j � � Wd | j � Xd S)a� Wait for the single Future or coroutine to complete, with timeout.
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� � q� W� r#| d k r#� j | | � � x" t t � � � D] } | � Vq6Wd S)am Return an iterator whose values are coroutines.
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for f in as_completed(fs):
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| � r� t t | � d | �St d � � d S)zmWrap a coroutine or an awaitable in a future.
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N)� __await__)Z awaitabler r r r� B s r� c s: e Z d Z d Z d d � f d d � Z d d � Z � S)�_GatheringFuturez�Helper for gather().
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a7 Return a future aggregating results from the given coroutines
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future.
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c sZ t | d | �} | j � r" | S| j } | j � � � f d d � } | j | � � S)a= Wait for a future, shielding it from cancellation.
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you can combine shield() with a try/except clause, as follows:
try:
res = yield from shield(something())
except CancelledError:
res = None
r c s~ � j � r& | j � s" | j � d S| j � r? � j � n; | j � } | d k rg � j | � n � j | j � � d S)N)r� r� rd rl rm rw )�innerra )r� r r r� � s
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