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*name*, a ``str``, the name of the backend. Currently the "trio"
and "asyncio" backends are available.
Raises NotImplementedError if an unknown backend name is specified.
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� Y y# t $ r t d� �w xY ww xY w)z�Attempt to determine the in-use asynchronous I/O library by using
the ``sniffio`` module if it is available.
Returns the name of the library, or raises AsyncLibraryNotFoundError
if the library cannot be determined.
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A:�A!�!A6�6A:c �@ � t rt S t t � � S )z6Get the default backend, initializing it if necessary.)�_default_backend�set_default_backendr& r r r �get_default_backendr* R s � �� � � �u�w� '�'r c �$ � t | � at S )a, Set the default backend.
It's not normally necessary to call this method, as
``get_default_backend()`` will initialize the backend
appropriately in many cases. If ``sniffio`` is not installed, or
in testing situations, this function allows the backend to be set
explicitly.
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