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� Z&dS )0z0Support for tasks, coroutines and the scheduler.�Task�FIRST_COMPLETED�FIRST_EXCEPTION�
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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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terminated by an exception, this returns the list of traceback
frames.
The frames are always ordered from oldest to newest.
The optional limit gives the maximum number of frames to
return; by default all available frames are returned. Its
meaning differs depending on whether a stack or a traceback is
returned: the newest frames of a stack are returned, but the
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Unlike Future.cancel, this does not guarantee that the
task will be cancelled: the exception might be caught and
acted upon, delaying cancellation of the task or preventing
cancellation completely. The task may also return a value or
raise a different exception.
Immediately after this method is called, Task.cancelled() will
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j | j � d } X d S ) Nz!_step(): already done: {!r}, {!r}F�_asyncio_future_blockingz6Task {!r} got Future {!r} attached to a different loopz!Task cannot await on itself: {!r}z;yield was used instead of yield from in task {!r} with {!r}zIyield was used instead of yield from for generator in task {!r} with {!r}zTask got bad yield: {!r}) r? r& �formatr- �
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� � � fdd�t| �D �} t| ||� �E dH S )a� Wait for the Futures and coroutines given by fs to complete.
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Note: This does not raise TimeoutError! Futures that aren't done
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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 ||fS )zeInternal helper for wait() and wait_for().
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for f in as_completed(fs):
result = yield from f # The 'yield from' may raise.
# Use result.
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|E dH S |j� X dS )z9Coroutine that completes after a given time (in seconds).r N)r r rk r rl r Z _set_result_unless_cancelledr@ )ZdelayrT r rU �hr r r r � s
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a7 Return a future aggregating results from the given coroutines
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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
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this will still cancel shield().
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try:
res = yield from shield(something())
except CancelledError:
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