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� Z&dS )0z0Support for tasks, coroutines and the scheduler.�Task�FIRST_COMPLETED�FIRST_EXCEPTION�
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d� Zdd�dd�Zddd�dd�Zdd� Zd � fdd� Zdd� Z� ZS ) r z A coroutine wrapped in a Future.TNc C s |dkrt j� }| jj|�S )z�Return the currently running task in an event loop or None.
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Nc s h | ]}|j � kr|�qS r )�_loop)�.0�t)r r r � <setcomp>B s z!Task.all_tasks.<locals>.<setcomp>)r r �
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_repr_info^ s zTask._repr_info)�limitc C s t j| |�S )a� Return the list of stack frames for this task's coroutine.
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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
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)r2 r; r r r � get_stacka s zTask.get_stack)r; �filec C s t j| ||�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)r2 r; r= r r r � print_stackx s zTask.print_stackc C s4 d| _ | j� rdS | jdk r*| jj� r*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
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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j | j � d } X d S ) Nz!_step(): already done: {!r}, {!r}F�_asyncio_future_blockingz6Task {!r} got Future {!r} attached to a different loopz!Task cannot await on itself: {!r}z;yield was used instead of yield from in task {!r} with {!r}zIyield was used instead of yield from for generator in task {!r} with {!r}zTask got bad yield: {!r}) r? r& �formatr- �
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� � � fdd�t| �D �} t| ||� �E dH S )a� Wait for the Futures and coroutines given by fs to complete.
The sequence futures must not be empty.
Coroutines will be wrapped in Tasks.
Returns two sets of Future: (done, pending).
Usage:
done, pending = yield from asyncio.wait(fs)
Note: This does not raise TimeoutError! Futures that aren't done
when the timeout occurs are returned in the second set.
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� r�| j� S | j |� | j � t j� �W d|j � 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.
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|� q�W ||fS )zeInternal helper for wait() and wait_for().
The fs argument must be a collection of Futures.
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� � q�W �r�|dk rʈj||��x tt���D ] }|� V q�W dS )am 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 = yield from f # The 'yield from' may raise.
# Use result.
If a timeout is specified, the 'yield from' will raise
TimeoutError when the timeout occurs before all Futures are done.
Note: The futures 'f' are not necessarily members of fs.
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|E dH S |j� X dS )z9Coroutine that completes after a given time (in seconds).r N)r r rk r rl r Z _set_result_unless_cancelledr@ )ZdelayrT r rU �hr r r r � s
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| �r~tt| �|d�S td��dS )zmWrap a coroutine or an awaitable in a future.
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c c s | j � E dH S )z�Helper for asyncio.ensure_future().
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Zdd� Z� ZS )�_GatheringFuturez�Helper for gather().
This overrides cancel() to cancel all the children and act more
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N)r c s t � j|d� || _d| _d S )N)r F)r( r) � _children�_cancel_requested)r2 �childrenr )r0 r r r) $ s z_GatheringFuture.__init__c C s: | j � r dS d}x| jD ]}|j� rd}qW |r6d| _|S )NFT)r? r� r@ r� )r2 ZretZchildr r r r@ ) s z_GatheringFuture.cancel)rV rW rX rY r) r@ r] r r )r0 r r� s r� F)r �return_exceptionsc s |s*| dkrt j� } | j� ��jg � �S i � xjt|�D ]^}tj|�sht|| d�}| dkr`|j} d|_ n&|}| dkr||j} n|j| k r�t
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a7 Return a future aggregating results from the given coroutines
or futures.
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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
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c s@ t | |d�}|j� r|S |j}|j� � � fdd�}|j|� � S )a= Wait for a future, shielding it from cancellation.
The statement
res = yield from shield(something())
is exactly equivalent to the statement
res = yield from 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 = yield from shield(something())
except CancelledError:
res = None
)r c s\ � j � r | j � s| j� d S | j � r.� j� n*| j� }|d k rJ� j|� n� j| j� � d S )N)rt ru r@ rH rI rT )�innerrS )r� r r r� � s
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c s: t j� �std��tjj� �� ��fdd�}�j|� �S )zsSubmit a coroutine object to a given event loop.
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