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d� Zdd�dd�Zddd�dd�Zdd� Zd � fdd� Zdd� Z� ZS ) r z A coroutine wrapped in a Future.TNc C s |dkrt j� }| jj|�S )z�Return the currently running task in an event loop or None.
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� � � fdd�t| �D �} t| ||� �E dH S )a� Wait for the Futures and coroutines given by fs to complete.
The sequence futures must not be empty.
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� r�| j� S | j |� | j � t j� �W d|j � X dS )a� Wait for the single Future or coroutine to complete, with timeout.
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� � q�W �r�|dk rʈj||��x tt���D ] }|� V q�W dS )am Return an iterator whose values are coroutines.
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This differs from PEP 3148; the proper way to use this is:
for f in as_completed(fs):
result = yield from f # The 'yield from' may raise.
# Use result.
If a timeout is specified, the 'yield from' will raise
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|E dH S |j� X dS )z9Coroutine that completes after a given time (in seconds).r N)r r ri r rj r Z _set_result_unless_cancelledr= )ZdelayrQ r rR �hr r r r � s
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done successfully, the returned future's result is the list of
results (in the order of the original sequence, not necessarily
the order of results arrival). If *return_exceptions* is True,
exceptions in the tasks are treated the same as successful
results, and gathered in the result list; otherwise, the first
raised exception will be immediately propagated to the returned
future.
Cancellation: if the outer Future is cancelled, all children (that
have not completed yet) are also cancelled. If any child is
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something(), the cancellation did not happen. But its caller is
still cancelled, so the yield-from expression still raises
CancelledError. Note: If something() is cancelled by other means
this will still cancel shield().
If you want to completely ignore cancellation (not recommended)
you can combine shield() with a try/except clause, as follows:
try:
res = yield from shield(something())
except CancelledError:
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