Current File : //lib64/python3.8/asyncio/__pycache__/tasks.cpython-38.opt-1.pyc
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r` Y nX e6Z>e9Z?e7Z@e8ZAdS )Fz0Support 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 )
base_tasks)
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exceptions)futures)
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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_loopdone.0tr r! r" <setcomp>< s z all_tasks.<locals>.<setcomp>)r r list
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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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None is returned when called not in the context of a Task.
zVTask.current_task() is deprecated since Python 3.7, use asyncio.current_task() instead
stacklevelN)warningswarnDeprecationWarningr r/ r clsr r! r! r" r t s zTask.current_taskc C s t jdtdd t|S )z|Return a set of all tasks for an event loop.
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Task.get_namec C s t || _d S r1 )rJ rI )rS valuer! r! r" r2 s z
Task.set_namec C s t dd S )Nz*Task does not support set_result operationr, )rS resultr! r! r"
set_result s zTask.set_resultc C s t dd S )Nz-Task does not support set_exception operationr^ )rS exceptionr! r! r"
set_exception s zTask.set_exception)limitc C s t | |S )a Return the list of stack frames for this task's coroutine.
If the coroutine is not done, this returns the stack where it is
suspended. If the coroutine has completed successfully or was
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
oldest frames of a traceback are returned. (This matches the
behavior of the traceback module.)
For reasons beyond our control, only one stack frame is
returned for a suspended coroutine.
)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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for the frames retrieved by get_stack(). The limit argument
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to which the output is written; by default output is written
to sys.stderr.
)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.
This arranges for a CancelledError to be thrown into the
wrapped coroutine on the next cycle through the event loop.
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
task will be marked as cancelled when the wrapped coroutine
terminates with a CancelledError exception (even if cancel()
was not called).
FNT)Z_log_tracebackr% rL cancelrK rY r! r! r" rg s
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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.
Return a Task object.
)r r r r6 )rT r5 r r4 r! r! r" r x s
r )r timeout return_whenc s t | st| r(tdt| j | s4td|tt t
fkrPtd| dkrbt nt
jdtdd fdd t| D } t| || I dH S )
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The fs iterable must not be empty.
Coroutines will be wrapped in Tasks.
Returns two sets of Future: (done, pending).
Usage:
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| |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.
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 r7 r8 r r )r r r: r; r< r r% r_ _cancel_and_waitr rj TimeoutError
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call_laterr functoolspartialrr rg remove_done_callback)futr~ r ru r timeout_handlecbr! r! r" r sL
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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().
The fs argument must be a collection of Futures.
Nc sZ d8 dks4t ks4tkrV| sV| d k rVd k rD sVd d S )Nr r )r r cancelledra rg r% r` r Zcounterr r r r! r" _on_completion s
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r r r lenrr rg r r r% add)r r~ r r r r r% Zpendingr! r r" r s( r c sF | }tt|}| | z| |I dH W 5 | | X dS )z<Cancel the *fut* future or task and wait until it completes.N)r r r r rr r rg )r r r r r! r! r" r & s
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d fdd}D ]}| qr|dk r҈||ttD ] }| V qdS )a^ Return an iterator whose values are coroutines.
When waiting for the yielded coroutines you'll get the results (or
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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z!as_completed.<locals>._on_timeoutc s4 sd S | | s0d k r0 d S r1 )remover rg r )r% r r r! r" r ^ s
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_wait_for_onef s z#as_completed.<locals>._wait_for_one)r r r rE rG r rx Zqueuesr r r/ r: r; r< r rr r ranger )r r r~ r r r r _r! )r r% r r r r" r 7 s*
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dV dS )zSkip one event loop run cycle.
This is a private helper for 'asyncio.sleep()', used
when the 'delay' is set to 0. It uses a bare 'yield'
expression (which Task.__step knows how to handle)
instead of creating a Future object.
Nr! r! r! r! r" __sleep0u s r c sr | dkrt I dH |S |dkr*t }ntjdtdd | }|| tj ||}z|I dH W S |
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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| |dS tddS )zmWrap a coroutine or an awaitable in a future.
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Nr? 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 rE r r/ r rD r r r$ r rt Z isawaitabler _wrap_awaitablerG )Zcoro_or_futurer r4 r! r! r" r s
r c c s | E dH S )zHelper for asyncio.ensure_future().
Wraps awaitable (an object with __await__) into a coroutine
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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().
This overrides cancel() to cancel all the children and act more
like Task.cancel(), which doesn't immediately mark itself as
cancelled.
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 dd|D ]f}||krt|| d}| dkrt |} ||k rd |_
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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.
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
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$| s | d S sd| rFt }| d S | }|d k rd| d S krg } D ]8} | rt }n| }|d kr| }|| qtjrĈt n
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a. Wait for a future, shielding it from cancellation.
The statement
res = await shield(something())
is exactly equivalent to the statement
res = await something()
*except* that if the coroutine containing it is cancelled, the
task running in something() is not cancelled. From the POV of
something(), the cancellation did not happen. But its caller is
still cancelled, so the yield-from expression still raises
CancelledError. Note: If something() is cancelled by other means
this will still cancel shield().
If you want to completely ignore cancellation (not recommended)
you can combine shield() with a try/except clause, as follows:
try:
res = await shield(something())
except CancelledError:
res = None
Nr r7 r8 r c s\ r | s| d S | r. n*| }|d k rJ | n | d S r1 )r ra rg rb r` r_ )innerru r r! r" _inner_done_callbacku s
z$shield.<locals>._inner_done_callbackc s s d S r1 )r% r r )r r r! r" _outer_done_callback s z$shield.<locals>._outer_done_callback) r: r; r< r r% r r$ r rr )r r r r! )r r r r" r P s
r c s: t stdtj fdd}| S )zsSubmit a coroutine object to a given event loop.
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z A coroutine object is requiredc
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