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dd Zdd ZddddZddd 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 )zReturn 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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)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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The coroutine then has a chance to clean up or even deny
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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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!Tr )r5 c C s t }|| }t|| |S )z]Schedule the execution of a coroutine object in a spawn task.
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The fs iterable must not be empty.
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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..)r isfuturer rE rG typerx
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rF | r$| Y W dS | | t| |dI dH Y nX | r^| W *S | | t| |dI dH t W 5 | X dS )a Wait for the single Future or coroutine to complete, with timeout.
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If the wait is cancelled, the task is also cancelled.
This function is a coroutine.
Nr r7 r8 r r )r r r: r; r< r r% r_ _cancel_and_waitr rj TimeoutError
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s | d|dk r"||tt| fdd}| D ]}|| q@zI dH W 5 dk rp | D ]}|| qtX t t }}| D ]"}| r| | q| | q||fS )zVInternal helper for wait().
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Nr! r! r! r! r" __sleep0u s r c sr | dkrt I dH |S |dkr*t }ntjdtdd | }|| tj ||}z|I dH W S |
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N) __await__)Z awaitabler! r! r" r s r c s. e Zd ZdZdd fdd
Zdd Z ZS )_GatheringFuturezHelper for gather().
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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
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| dS ) a Return a future aggregating results from the given coroutines/futures.
Coroutines will be wrapped in a future and scheduled in the event
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.
Nr r7 r8 c s d7 r$| s | d S sd| rFt }| d S | }|d k rd| d S krg } D ]8} | rt }n| }|d kr| }|| qtjrĈt n
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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()
*except* that if the coroutine containing it is cancelled, the
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
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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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