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5 Z6i Z7dd? Z9d@dA Z:dBdC Z;e8Ze:Z?z$ddDl m8Z8m;Z;m9Z9m:Z:m6Z6m7Z7 W n e yz Y n0 e8Z@e;ZAe9ZBe:ZCdS )Iz0Support for tasks, coroutines and the scheduler.)Task create_taskFIRST_COMPLETEDFIRST_EXCEPTION
ALL_COMPLETEDwaitwait_for as_completedsleepgathershield
ensure_futurerun_coroutine_threadsafe current_task all_tasks_register_task_unregister_task _enter_task _leave_task N) GenericAlias )
base_tasks)
coroutines)events)
exceptions)futures)
_is_coroutinec C s | du rt } t| S )z!Return a currently executed task.N)r get_running_loop_current_tasksgetloop r" 2/opt/alt/python39/lib64/python3.9/asyncio/tasks.pyr # s r c s\ du rt d}z tt}W qJ tyD |d7 }|dkr@ Y q0 qJq fdd|D S )z'Return a set of all tasks for the loop.Nr r c s& h | ] }t | u r| s|qS r" )r _get_loopdone.0tr r" r# = s z all_tasks..)r r list
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| _| jj| j| jd t| d S )Nr Fz a coroutine was expected, got zTask-context)super__init___source_tracebackr iscoroutine_log_destroy_pending TypeError_task_name_counter_namestr _must_cancel _fut_waiter_coro contextvarsZ copy_context_context_loop call_soon _Task__stepr )selfcoror! r7 __class__r" r# r= u s
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set_exception s zTask.set_exception)limitc C s t | |S )a Return the list of stack frames for this task's coroutine.
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cancelled, this returns an empty list. If the coroutine was
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_get_stack)rM r] r" r" r# get_stack s zTask.get_stack)r] filec C s t | ||S )an Print the stack or traceback for this task's coroutine.
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to which the output is written; by default output is written
to sys.stderr.
)r Z_task_print_stack)rM r] r_ r" r" r# print_stack s zTask.print_stackc C s> d| _ | rdS | jdur.| jj|dr.dS d| _|| _dS )a Request that this task cancel itself.
This arranges for a CancelledError to be thrown into the
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The coroutine then has a chance to clean up or even deny
the request using try/except/finally.
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
not return True (unless the task was already cancelled). A
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FNmsgT)Z_log_tracebackr& rF cancelrE _cancel_message)rM rb r" r" r# rc s
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| d } 0 d S )Nz_step(): already done: z, Fra _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 ZInvalidStateErrorrE
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"Wr )r7 c C s t }|| }t|| |S )z]Schedule the execution of a coroutine object in a spawn task.
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)r r r r8 )rN r7 r! r6 r" r" r# r c s
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a Wait for the Futures and coroutines given by fs to complete.
The fs iterable must not be empty.
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done, pending = await asyncio.wait(fs)
Note: This does not raise TimeoutError! Futures that aren't done
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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.
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| 0 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.
This function is a coroutine.
Nr r r r r )r r r r r r r& rY _cancel_and_waitr rg TimeoutError
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s | s J d| d|dur.||tt| fdd}| D ]}|| qLz2I dH W durz | D ]}|| q~n&dur | D ]}|| q0 t t }}| D ]"}| r| | q| | q||fS )zVInternal helper for wait().
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z!as_completed.._on_timeoutc s4 sd S | | s0d ur0 d S r3 )remover rc r )r& r r r" r# r V s
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Nr" r" r" r" r# __sleep0m s r c s~ |durt jdtdd | dkr0t I dH |S |du r@t }| }|| tj ||}z|I dH W |
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Nr9 zRThe future belongs to a different loop than the one specified as the loop argumentr z:An asyncio.Future, a coroutine or an awaitable is required)r r? r r1 r r> r r r% r rr Z isawaitabler _wrap_awaitablerA )Zcoro_or_futurer! r6 r" r" r# r s
r c c s | E dH S )zHelper for asyncio.ensure_future().
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N) __await__)Z awaitabler" r" r# r s r c s0 e Zd ZdZdd fdd
ZdddZ ZS ) _GatheringFuturezHelper for gather().
This overrides cancel() to cancel all the children and act more
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cancelled.
Nr c s t j|d || _d| _d S )Nr F)r< r= _children_cancel_requested)rM childrenr! rO r" r# r= s z_GatheringFuture.__init__c C s: | r dS d}| jD ]}|j|drd}q|r6d| _|S )NFra T)r& r rc r )rM rb Zretchildr" r" r# rc s
z_GatheringFuture.cancel)N)rv rw rx ry r= rc r| r" r" rO r# r s r Fr! return_exceptionsc G s( | durt jdtdd t|| |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.
All futures must share the same event loop. If all the tasks are
done successfully, the returned future's result is the list of
results (in the order of the original sequence, not necessarily
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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()``
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Nr r r r )r r r _gather)r! r coros_or_futuresr" r" r# r
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r c st |durt jdtdd t| |d r0S t}| fdd fdd } | S )
a. Wait for a future, shielding it from cancellation.
The statement
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
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try:
res = await shield(something())
except CancelledError:
res = None
Nr r r r c s\ r | s| d S | r. n*| }|d urJ | n | d S r3 )r r[ rc r\ rZ rY )innerrs r r" r# _inner_done_callbackz s
z$shield.._inner_done_callbackc s s d S r3 )r& r r )r r r" r# _outer_done_callback s z$shield.._outer_done_callback) r r r r r& r r% r rp )r r! r r" )r r r r# r U s
r c s: t stdtj fdd}| S )zsSubmit a coroutine object to a given event loop.
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