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rF |d7 }|dkrB� Y qX qLq� fdd�|D �S )z'Return a set of all tasks for the loop.Nr r �� c s& h | ] }t �|�� kr|�� s|�qS r! )r � _get_loop�done��.0�tr r! r" � <setcomp>< s �z all_tasks.<locals>.<setcomp>)r r �list�
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dd� Zdd� Zdd�dd�Zddd �d d �Zd d � Zd'� fd!d"� Zd#d$� Z� ZS )(r z A coroutine wrapped in a Future.TNc C s( t jdtdd� |dkr t�� }t|�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
oldest frames of a traceback are returned. (This matches the
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)r Z_task_get_stack)rS rc r! r! r" � get_stack� s zTask.get_stack)rc �filec C s t �| ||�S )an Print the stack or traceback for this task's coroutine.
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)r Z_task_print_stack)rS rc re r! r! r" � print_stack� s zTask.print_stackc C s4 d| _ | �� rdS | jdk r*| j�� r*dS d| _dS )a� Request that this task cancel itself.
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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.
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| j | � d } X d S )Nz_step(): already done: z, F�_asyncio_future_blockingzTask z got Future z attached to a different loopr@ z Task cannot await on itself: z-yield was used instead of yield from in task z with z;yield was used instead of yield from for generator in task zTask got bad yield: )"r% r ZInvalidStateErrorrK �
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!Tr )r5 c C s t �� }|�| �}t||� |S )z]Schedule the execution of a coroutine object in a spawn task.
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a� Wait for the Futures and coroutines given by fs to complete.
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done, pending = await asyncio.wait(fs)
Note: This does not raise TimeoutError! Futures that aren't done
when the timeout occurs are returned in the second set.
z expect a list of futures, not z#Set of coroutines/Futures is empty.zInvalid return_when value: N�[The loop argument is deprecated since Python 3.8, and scheduled for removal in Python 3.10.r7 r8 c s h | ]}t |� d ��qS �r �r �r' �fr r! r" r) � s zwait.<locals>.<setcomp>)r �isfuturer rE rG �typerx �
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�rF | �� �r$| �� Y W �dS | �|� t| |d�I dH � Y nX | �� �r^| �� W �*S | �|� t| |d�I dH t � � �W 5 |�� X dS )a� Wait for the single Future or coroutine to complete, with timeout.
Coroutine will be wrapped in Task.
Returns result of the Future or coroutine. When a timeout occurs,
it cancels the task and raises TimeoutError. To avoid the task
cancellation, wrap it in shield().
If the wait is cancelled, the task is also cancelled.
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� s� |� � �d�|dk r"|�|t���t| �� � ���fdd�}| D ]}|�|� q@z�I dH W 5 �dk rp��� | D ]}|�|� qtX t� t� }}| D ]"}|�� r�|� |� q�|� |� q�||fS )zVInternal helper for wait().
The fs argument must be a collection of Futures.
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d�� �fdd�}�D ]}|�� � q��r�|dk r҈�||��tt���D ] }|� V q�dS )a^ Return an iterator whose values are coroutines.
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exceptions!) of the original Futures (or coroutines), in the order
in which and as soon as they complete.
This differs from PEP 3148; the proper way to use this is:
for f in as_completed(fs):
result = await f # The 'await' may raise.
# Use result.
If a timeout is specified, the 'await' will raise
TimeoutError when the timeout occurs before all Futures are done.
Note: The futures 'f' are not necessarily members of fs.
z#expect an iterable of futures, not r )�Queuer Nr� r7 r8 c s h | ]}t |� d ��qS r� r� r� r r! r" r) U s z as_completed.<locals>.<setcomp>c s* �D ]} | � � � ��d � q��� d S r1 )r� �
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dV dS )z�Skip one event loop run cycle.
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� X dS )z9Coroutine that completes after a given time (in seconds).r Nr� r7 r8 ) r� r r r: r; r< r� r� r Z _set_result_unless_cancelledrg )Zdelayr_ r rw �hr! r! r" r � s$
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| �|d�S td��dS )zmWrap a coroutine or an awaitable in a future.
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N)� __await__)Z awaitabler! r! r" r� � s r� c s. e Zd ZdZdd�� fdd�
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Nr c s t � j|d� || _d| _d S )Nr F)rB rC � _children�_cancel_requested)rS �childrenr rU r! r" rC � s z_GatheringFuture.__init__c C s6 | � � r dS d}| jD ]}|�� rd}q|r2d| _|S )NFT)r% r� rg r� )rS ZretZchildr! r! r" rg � s
z_GatheringFuture.cancel)rx ry rz r{ rC rg r} r! r! rU r" r� � s r� F)r �return_exceptionsc s� |s<| dkrt �� } ntjdtdd� | �� ���g � �S � ����fdd�}i }g � d�d�|D ]f}||kr�t|| d�}| dkr�t� |�} ||k r�d |_
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� | d���S ) a� Return a future aggregating results from the given coroutines/futures.
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loop. They will not necessarily be scheduled in the same order as
passed in.
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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
cancelled, this is treated as if it raised CancelledError --
the outer Future is *not* cancelled in this case. (This is to
prevent the cancellation of one child to cause other children to
be cancelled.)
If *return_exceptions* is False, cancelling gather() after it
has been marked done won't cancel any submitted awaitables.
For instance, gather can be marked done after propagating an
exception to the caller, therefore, calling ``gather.cancel()``
after catching an exception (raised by one of the awaitables) from
gather won't cancel any other awaitables.
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a. Wait for a future, shielding it from cancellation.
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res = await shield(something())
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res = await something()
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task running in something() is not cancelled. From the POV of
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 = await shield(something())
except CancelledError:
res = None
Nr� r7 r8 r c s\ � � � r | � � s| �� d S | � � r.� �� n*| �� }|d k rJ� �|� n� �| �� � d S r1 )r� ra rg rb r` r_ )�innerru �r� r! r" �_inner_done_callbacku s
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c C s t �| � dS )z3Register a new task in asyncio as executed by loop.N)r+ r� �r4 r! r! r" r � s r c C s4 t �| �}|d k r(td|�d|�d���|t | < d S )NzCannot enter into task z while another task z is being executed.�r r r, �r r4 r r! r! r" r � s
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