Anyio

- Added ``start_new_session`` keyword argument to ``run_process()`` and
``open_process()`` (PR by Jordan Speicher)
- Fixed deadlock in synchronization primitives on asyncio which can happen if a task
acquiring a primitive is hit with a native (not AnyIO) cancellation with just the
right timing, leaving the next acquiring task waiting forever
(`398 <https://github.com/agronholm/anyio/issues/398>`_)
- Added workaround for bpo-46313_ to enable compatibility with OpenSSL 3.0

.. _bpo-46313: https://bugs.python.org/issue46313

- Added context propagation to/from worker threads in ``to_thread.run_sync()``,
``from_thread.run()`` and ``from_thread.run_sync()``
(`363 <https://github.com/agronholm/anyio/issues/363>`_; partially based on a PR by
Sebastián Ramírez)

**NOTE**: Requires Python 3.7 to work properly on asyncio!
- Fixed race condition in ``Lock`` and ``Semaphore`` classes when a task waiting on
``acquire()`` is cancelled while another task is waiting to acquire the same primitive
(`387 <https://github.com/agronholm/anyio/issues/387>`_)
- Fixed async context manager's ``__aexit__()`` method not being called in
``BlockingPortal.wrap_async_context_manager()`` if the host task is cancelled
(`381 <https://github.com/agronholm/anyio/issues/381>`_; PR by Jonathan Slenders)
- Fixed worker threads being marked as being event loop threads in sniffio
- Fixed task parent ID not getting set to the correct value on asyncio
- Enabled the test suite to run without IPv6 support, trio or pytest plugin autoloading

- Fixed ``BrokenResourceError`` instead of ``EndOfStream`` being raised in ``TLSStream``
when the peer abruptly closes the connection while ``TLSStream`` is receiving data
with ``standard_compatible=False`` set

- Fixed UNIX socket listener not setting accepted sockets to non-blocking mode on
asyncio
- Changed unconnected UDP sockets to be always bound to a local port (on "any"
interface) to avoid errors on asyncio + Windows

- Fixed cancellation problem on asyncio where level-triggered cancellation for **all**
parent cancel scopes would not resume after exiting a shielded nested scope
(`370 <https://github.com/agronholm/anyio/issues/370>`_)

- Added missing documentation for the ``ExceptionGroup.exceptions`` attribute
- Changed the asyncio test runner not to use uvloop by default (to match the behavior of
``anyio.run()``)
- Fixed ``RuntimeError`` on asyncio when a ``CancelledError`` is raised from a task
spawned through a ``BlockingPortal``
(`357 <https://github.com/agronholm/anyio/issues/357>`_)
- Fixed asyncio warning about a ``Future`` with an exception that was never retrieved
which happened when a socket was already written to but the peer abruptly closed the
connection