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Rj " 5 r6\7" 5 r80 r9S) r:S* r;S+ rS. r?S/ r@\rA\:rB\;rC\?rD\@rE\rH SS0K J:r:J;r;J?r?J@r@Jr>J6r6J8r8J9r9Jr \rI\:rJ\;rK\?rL\@rM\rPg! \ a GN.f = f! \ a gf = f)2z0Support for tasks, coroutines and the scheduler.)Task create_taskFIRST_COMPLETEDFIRST_EXCEPTION
ALL_COMPLETEDwaitwait_for as_completedsleepgathershield
ensure_futurerun_coroutine_threadsafe current_task all_taskscreate_eager_task_factoryeager_task_factory_register_task_unregister_task _enter_task _leave_task N) GenericAlias )
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nUS: a e Of = fM s snf )z'Return a set of all tasks for the loop.Nr r i ) r r" list _eager_tasks_scheduled_tasks RuntimeError itertoolschainr _get_loopdone)r& eager_tasksscheduled_tasksits r' r r , s |&&( |$K O A
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rS rS rSS.S jrSSS.S jrS S jrS rS rS rS S jrU 4S jrS rSrU =r $ ) r G z A coroutine wrapped in a Future.TNFr& namecontext eager_startc h > [ TU ] US9 U R ( a
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r( c [ S5 e)Nz*Task does not support set_result operationr- )rT results r'
set_resultTask.set_result s GHHr( c [ S5 e)Nz-Task does not support set_exception operationrv )rT exceptions r'
set_exceptionTask.set_exception s JKKr( )limitc . [ R " X5 $ )a% Return the list of stack frames for this task's coroutine.
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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 _task_get_stack)rT r~ s r' get_stackTask.get_stack s * ))$66r( )r~ filec 0 [ R " XU5 $ )a> Print the stack or traceback for this task's coroutine.
This produces output similar to that of the traceback module,
for the frames retrieved by get_stack(). The limit argument
is passed to get_stack(). The file argument is an I/O stream
to which the output is written; by default output is written
to sys.stderr.
)r _task_print_stack)rT r~ r s r' print_stackTask.print_stack s ++D>>r( c SU l U R 5 ( a gU =R S-
sl U R b U R R US9( a gSU l Xl g)aJ 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).
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Fr msgT)_log_tracebackr1 rH rJ cancelrI _cancel_message)rT r s r' r Task.cancel sf , $ 99;; ##q(# ' &&3&/ " r( c U R $ )zReturn the count of the task's cancellation requests.
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)rH rd s r'
cancellingTask.cancelling s ***r( c U R S: a, U =R S- sl U R S:X a SU l U R $ )zDecrement the task's count of cancellation requests.
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__classcell__rV s @r' r r G s +. %)d " ! !> $L1+ IL "& 7. $(d ?(T+ + )&"IV r( r r9 r: c x [ R " 5 nUc UR XS9nU$ UR XUS9nU$ )zUSchedule the execution of a coroutine object in a spawn task.
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)r9 r )r r" r )rU r9 r: r& rY s r' r r sM
" " $D 0 K A Kr( )timeout return_whenc # [ R " U 5 ( d [ R " U 5 ( a! [ S[ U 5 R 35 eU ( d [ S5 eU[ [ [ 4; a [ SU 35 e[ U 5 n [ S U 5 5 ( a [ S5 e[ R " 5 n[ XX#5 I Sh vN $ N7f)a7 Wait for the Futures or Tasks given by fs to complete.
The fs iterable must not be empty.
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z expect a list of futures, not z Set of Tasks/Futures is empty.zInvalid return_when value: c 3 N # U H n[ R " U5 v M g 7frb )r rB ).0fs r' wait.. s
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a n[ UeSnAff = f ND N< N.! , ISh vN ( d f g= f7f)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.
If the task suppresses the cancellation and returns a value instead,
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$ *0 *,r( r )r c [ R " U 5 ( a! [ S[ U 5 R 35 e[ X5 $ )a Create an iterator of awaitables or their results in completion order.
Run the supplied awaitables concurrently. The returned object can be
iterated to obtain the results of the awaitables as they finish.
The object returned can be iterated as an asynchronous iterator or
a plain iterator. When asynchronous iteration is used, the
originally-supplied awaitables are yielded if they are tasks or
futures. This makes it easy to correlate previously-scheduled tasks
with their results:
ipv4_connect = create_task(open_connection("127.0.0.1", 80))
ipv6_connect = create_task(open_connection("::1", 80))
tasks = [ipv4_connect, ipv6_connect]
async for earliest_connect in as_completed(tasks):
# earliest_connect is done. The result can be obtained by
# awaiting it or calling earliest_connect.result()
reader, writer = await earliest_connect
if earliest_connect is ipv6_connect:
print("IPv6 connection established.")
else:
print("IPv4 connection established.")
During asynchronous iteration, implicitly-created tasks will be
yielded for supplied awaitables that aren't tasks or futures.
When used as a plain iterator, each iteration yields a new coroutine
that returns the result or raises the exception of the next completed
awaitable. This pattern is compatible with Python versions older than
3.13:
ipv4_connect = create_task(open_connection("127.0.0.1", 80))
ipv6_connect = create_task(open_connection("::1", 80))
tasks = [ipv4_connect, ipv6_connect]
for next_connect in as_completed(tasks):
# next_connect is not one of the original task objects. It must
# be awaited to obtain the result value or raise the exception
# of the awaitable that finishes next.
reader, writer = await next_connect
A TimeoutError is raised if the timeout occurs before all awaitables
are done. This is raised by the async for loop during asynchronous
iteration or by the coroutines yielded during plain iteration.
z'expects an iterable of awaitables, not )r isawaitablerD r r r )r r s r' r r } sE ` 2 5d2h6G6G5H I
,,r( c # # Sv g7f)zSkip one event loop run cycle.
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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' __sleep0r s
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" U 5 ( d4 [ R " U 5 ( a S nU" U 5 n SnO [ S5 eUc [ R " 5 n UR U 5 $ ! [ a U( a U R 5 e f = f)zeWrap a coroutine or an awaitable in a future.
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T $ )aM 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.
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XD 1E s Lr( c ^^^ [ U 5 mTR 5 ( a T$ [ R " T5 nUR 5 mU4S jmUU4S jnTR T5 TR U5 T$ )a- Wait for a future, shielding it from cancellation.
The statement
task = asyncio.create_task(something())
res = await shield(task)
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:
task = asyncio.create_task(something())
try:
res = await shield(task)
except CancelledError:
res = None
Save a reference to tasks passed to this function, to avoid
a task disappearing mid-execution. The event loop only keeps
weak references to tasks. A task that isn't referenced elsewhere
may get garbage collected at any time, even before it's done.
c P > TR 5 ( a& U R 5 ( d U R 5 g U R 5 ( a TR 5 g U R 5 nUb TR U5 g TR U R 5 5 g rb )r r{ r r| rx rw )innerr rB s r' _inner_done_callback$shield.._inner_done_callback ss ?? ??$$! ?? LLN//#C##C( 0r( c T > TR 5 ( d TR T5 g g rb )r1 r )rB rL rK s r' _outer_done_callback$shield.._outer_done_callback s" zz|| & &'; < r( )r
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(F h' Mr( c ^ SSS.U 4S jjnU$ )a Create a function suitable for use as a task factory on an event-loop.
Example usage:
loop.set_task_factory(
asyncio.create_eager_task_factory(my_task_constructor))
Now, tasks created will be started immediately (rather than being first
scheduled to an event loop). The constructor argument can be any
callable that returns a Task-compatible object and has a signature
compatible with `Task.__init__`; it must have the `eager_start`
keyword argument.
Most applications will use `Task` for `custom_task_constructor` and in
this case there's no need to call `create_eager_task_factory()`
directly. Instead the global `eager_task_factory` instance can be
used. E.g. `loop.set_task_factory(asyncio.eager_task_factory)`.
Nr c > T" XX#SS9$ )NTr8 r )r& rU r9 r: custom_task_constructors r' factory*create_eager_task_factory..factory s & $TK Kr( r )r\ r] s ` r' r r s ( %)$ K K Nr( c 0 [ R " U 5 g)z;Register an asyncio Task scheduled to run on an event loop.N)r, r rY s r' r r s r( c 0 [ R " U 5 g)z6Register an asyncio Task about to be eagerly executed.N)r+ r r` s r' r r s Tr( c p [ R " U 5 nUb [ SU< SU< S35 eU[ U ' g )NzCannot enter into task z while another task z is being executed.r# r$ r- r& rY r s r' r r $ sL !%%d+L 4TH =##/"22E G H H N4r( c n [ R " U 5 nX!La [ SU< SU< S35 e[ U g )Nz
Leaving task z! does not match the current task .rc rd s r' r r , sH !%%d+L ]4( 3//;.>a A B Bt r( c \ [ R " U 5 nUc [ U U$ U[ U ' U$ rb )r# r$ )r& rY r s r' r r 4 s9 ""4(I | 4 $t r( c 0 [ R " U 5 g)z'Unregister a completed, scheduled Task.N)r, discardr` s r' r r = s T"r( c 0 [ R " U 5 g)z6Unregister a task which finished its first eager step.N)r+ ri r` s r' r r B s r( ) r r r r r r r r, r+ r# r rb )Qr __all__concurrent.futuresrW rL r r r. r! typesweakrefr r< r r r r r r r countr rE r r _PyFuturer _PyTask_asyncio_CTask ImportErrorr r r r r r r r r r r coroutiner r
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