New Features

• Add support for Python 3.8.
  (by @1st1 in 5f48dab8, 51636f7b)

Bug Fixes

• Multiple fixes in the SSL/TLS layer.
  (by @fantix in 82104fb6 for #263, 7fcbfed1 for #255, e6fd6377)

• Restore signal.wakeup_fd after the event loop is closed.
  (by @vladima in 48d376d3, @1st1 in d76d9827)

• Handle large timeouts in loop.call_later().
  (by @1st1 in 1a0d6578 for #259)

• Fix possible feezing of uvloop on os.fork.
  (by @grungy-ado in fde5d14f)

• Better handle Unix sockets for datagram transports.
  (by @mosquito and @1st1 in dd4cb7ac for #269)

• Avoid double connecting to remote_addr for datagram transports.
  (by @1st1 in bed926c5 for #276)

Build

• Bump Cython to 0.29.13.
  (by @1st1 in 65c1a045)

• Bump libuv to v1.33.1.
  (by @1st1 in 34fd827e)

This is the second release candidate.

See the full list of updates in 0.14.0rc1 release notes.

RC2 Bug Fixes

• Fix libuv not waking up on SIGINT.
  (by @1st1 in c32c703 for #295)

• Fix SSL proto to better handle EOF.
  (by @fantix in 6476aad)

New Features

• Add support for Python 3.8.
  (by @1st1 in 5f48dab8, 51636f7b)

Bug Fixes

• Multiple fixes in the SSL/TLS layer.
  (by @fantix in 82104fb6 for #263, 7fcbfed1 for #255)

• Restore signal.wakeup_fd after the event loop is closed.
  (by @vladima in 48d376d3)

• Handle large timeouts in loop.call_later().
  (by @1st1 in 1a0d6578 for #259)

• Fix possible feezing of uvloop on os.fork.
  (by @grungy-ado in fde5d14f)

• Better handle Unix sockets for datagram transports.
  (by @mosquito and @1st1 in dd4cb7ac for #269)

• Avoid double connecting to remote_addr for datagram transports.
  (by @1st1 in bed926c5 for #276)

Build

• Bump Cython to 0.29.13.
  (by @1st1 in 65c1a045)

• Bump libuv to v1.33.1.
  (by @1st1 in 34fd827e)

New Features

• Implement Server.start_serving() and related APIs.
  (by @jlaine in 7a4f00a3)

• Make Server an asynchronous context manager.
  (by @jlaine in d6c67e7a for #221)

Performance

• Start using high-performance uv_udp_t handle. This
  should result in a significantly faster UDP support.
  (by @1st1 in c2b65bc8)

• Make address validation faster in udp.sendto().
  (by @1st1 in 46c5e9eb)

Misc

• OSError is no longer logged by Transports.
  This matches asyncio behaviour in 3.8.
  (by @Tobotimus in ef29dab2)

Build

• Upgrade to libuv v1.31.0.
  (by @1st1 in c2b65bc8 and 1fad621f)

• Use manylinux-2010. This means we no longer provide
  32bit builds for Linux.
  (by @1st1 in 3174b7d3)

New Features

• Implement Server.start_serving() and related APIs.
  (by @jlaine in 7a4f00a3)

• Make Server an asynchronous context manager.
  (by @jlaine in d6c67e7a for #221)

Performance

• Start using high-performance uv_udp_t handle. This
  should result in a significantly faster UDP support.
  (by @1st1 in c2b65bc8)

• Make address validation faster in udp.sendto().
  (by @1st1 in 46c5e9eb)

Build

• Upgrade to libuv v1.28.0.
  This is a minimum requirement now.
  (by @1st1 in c2b65bc8)

• Use manylinux-2010. This means we no longer provide
  32bit builds for Linux.
  (by @1st1 in 3174b7d3)

Bug Fixes

• Fix circular references in SSL implementation to reduce
  the need for GC.
  (by @fantix in 3070ec85)

• Fix a memory leak in call_later() and call_at().
  The leak occurred when a callback argument had a reference to
  the event loop.
  (by @1st1 in 1a5dbc28 for #239)

• Fix compilation warnings.
  (by @JelleZijlstra in d9a111be)

• Round (instead of flooring) delay in call_later().
  This ensures that the callback is never called slightly before
  the specified time.
  (by @fantix in 8f037a68 for #233)

Bug Fixes

• Fix a circular references case in SSL implementation.
  (by @fantix in a2e0dd8e for #220)

• Cleanup references to callbacks in canceled callback handles.

  This removes potential reference cycles between bound methods
  and cancelled Handle / TimerHandle objects.

  (by @1st1 in f0a945df)

New Features

• New SSL implementation. The new implementation is faster and
  and more complete, and might become the default SSL implementation
  in asyncio 3.9.

  See the linked issue for more details.

  (by @fantix in 9cba7493 for #158, #176)

• New uvloop.install() helper function.

  Instead of

  import asyncio
  import uvloop
  asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
  

  it is now possible to simply write

  import uvloop
  uvloop.install()
  

  (by @1st1 in a3d8d401)

Bug Fixes

• All bug fixes from 0.11.0—0.11.3 are included in
  this release.

• ssl.CertificateError is no longer logged as it's delivered to
  the Protocol.connection_lost() anyways.
  (by @fantix in 848e4785 for #195, #199)

• Don't use non-existent UDPTransport._address attribute.
  (by @jlaine in f24c2c56 for #207)

Performance

• Improve UDPTransport.sendto() performance.
  (by @jlaine in d5ad2b86 for #214)

Build

• Upgrade Cython 0.28.x -> 0.29.0.

• Upgrade libuv v1.22.0 -> v1.23.0.

New Features

• New SSL implementation. The new implementation is faster and
  and more complete, and will become the default SSL implementation
  in asyncio 3.8. This is a significant change that warrants a release
  candidate to make sure it is tested properly.

  See the linked issue for more details.

  (by @fantix in 9cba7493 for #158, #176)

• New uvloop.install() helper function.

  Instead of

  import asyncio
  import uvloop
  asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
  

  it is now possible to simply write

  import uvloop
  uvloop.install()
  

  (by @1st1 in a3d8d401)

Bug Fixes

• All bug fixes from 0.11.0—0.11.3 are included in
  this release.

• ssl.CertificateError is no longer logged as it's delivered to
  the Protocol.connection_lost() anyways.
  (by @fantix in 848e4785 for #195, #199)

Build

• Upgrade Cython 0.28.x -> 0.29.0.

• Upgrade libuv v1.22.0 -> v1.23.0.

Bug Fixes

• Use new PyOS_BeforeFork and PyOS_AfterFork_* 3.7 APIs when available
  (by @1st1 in 75e7c32a)

• Fix async generators finalization to function correctly in debug mode
  (by @1st1 in dcbb1f4f for #200)

• Pass backlog to loop.create_unix_server() when a server is created via
  loop.create_server(sock=unix_sock, backlog=backlog).
  (by @hikoz in 40ad257b)

• Don't raise "requires a DNS lookup" error on Unix Domain Socket (#204)
  (by @pax0r in 9fc3ca2a for #204)

• Fix use of PyContext* APIs in 3.7.1
  (by @1st1 in 74748005)

Build

• Bump Cython to 0.28.5
  (by @1st1 in 1bbd6a82)

Bug Fixes

• Fix a memory leak related to contextvars support.
  (by @hellysmile and @1st1 in 2ddb4807 for #192)

Note: this is a bugfix release for 0.10.x branch. It's recommended to upgrade to 0.11.x.

Bug Fixes

• Fix a memory leak in contextvars support.
  (https://github.com/MagicStack/uvloop/pull/192 for more details)

Bug Fixes

• Fix server to shutdown when alive connections exist
  (by @ciscorn in 5f71e29f for #180 in PR #181)

• Fix a few bugs and crashes in UDP layer
  (by @1st1 in e0b5ea03, 5eef2d5f for #190)

• Fix FD leakage if spawning a subprocess fails
  (by @1st1 in 4f6621eb for #185, #186)

• Fix libuv process handles leak when uv_spawn() fails
  (by @1st1 in 92ea5179 for #187)

New Features

• Implement support for BufferedProtocol.
  (by @1st1 in a959f274, 76b34bef, f9c43937)

• Implement loop.start_tls().
  (by @1st1 in 622ed9c5)

• Add Server.get_loop().
  (by @1st1 in 6a42f841)

Bug Fixes

• Fix Server to wait in wait_closed() until all transports are done.
  (by @1st1 in 124e981b)

• SSLTransport.abort() should mark the transport as closed.
  (by @1st1 in 4d6621f7)

• Fix 3.7 32bit builds.
  (by @1st1 in a68f3c9a, b5b4abb1 for #172)

Build

• setup.py: Detect if the libuv submodule has not been checked out.
  (by @1st1 in a190cddb)

• Fix race between futures cancellation and loop.remove_reader() /
  loop.remove_writer().
  (by @andr-04 and @1st1 in cb0a65ae for #169)

• Enable 3.7 CI on Travis and build wheels for 3.7.
  (by @1st1 in 37f964b7 for #179)

Bug Fixes

• Use a proper type for the thread indent (fixes 32-bit build for 3.7.)
  (by @1st1 in 700582a9 for #172)

• Fix cancellation race in loop.sock_recv() and loop.sock_recv_into()
  methods. (by @andr-04 and @1st1 in 298851bf for #169)

• Sync SSL error messages with CPython's SSL implementation.
  (by @1st1 in c3aeff2a)

• Fix SSLTransport.abort() to mark the transport as closed.
  (by @1st1 in ba25d8be)

• Detect if libuv submodule has not been checked out in setup.py.
  (by @1st1 in dd8060d2)

Bug Fixes

• Bump Cython from 0.28.2 to 0.28.3.
  (by @1st1 in 5044d240)

• Increase default SSL handshake timeout to 60 seconds.
  (by @1st1 in 70c332cf, fixes #161)

• Add ssl_handshake_timeout parameter to loop.create_connection(),
  loop.create_server(), loop.create_unix_connection(),
  loop.create_unix_server(), loop.connect_accepted_socket().
  (by @1st1 in 68dd7337, addresses #161)

• Consistently close transports if create_server/create_connection/etc
  timeout or cancelled.
  (by @1st1 in ac90d8bd and 77ee4f96)

New Features

• Initial support for Python 3.7.
  (by @pfreixes in c3a5ec8e for #138)

• Implement PEP 567 support (contextvars module) for Python 3.7.
  (by @1st1 in 2a4fab44, 878e4163, and b2bdaae3 for #155)

• Add uvloop's own version of asyncio/sslproto.py. SSL is now ~50% faster.
  (by @1st1 in 4d912643)

• Convert Future-returning loop methods to coroutines to match asyncio 3.7.
  (by @1st1 in 7384b22f)

• Allow file objects to be passed to loop.subprocess*() functions.
  (by @1st1 in f0830901 for #136)

• Make signals processing more reliable.
  (by @1st1 in 6e03e513)

• Prohibit adding a signal handler for SIGCHLD.
  (by @1st1 in cd53b7f5 for #156)

• Add uvloop.__version__.
  (by @1st1 in 740cb7f3 for #137)

Bug Fixes

• Upgrade to Cython 0.28.2.
  (by @1st1 in 98bdb553 for #122)

• Update libuv from v1.17.0 to v1.20.3.
  (by @1st1 in 572524a6)

• Make sure UDP handles are cleaned-up properly.
  (by @1st1 in 13f63e00)

• Fix subprocess.close() to let its processes die gracefully.
  (by @1st1 in a78e4d27 and a455af3d for #128)

• Fix sock_connect() to resolve addresses for correct socket family.
  (by @1st1 in ce2bd4fb for #139)

• Fix a race condition in SSL handshake.
  (by @1st1 in 447e124f)

• Stop using malloc for uv_request* handlers.

• Fix loop.add_reader(), loop.add_writer(), loop.remove_reader(),
  and loop.remove_writer() to better track socket objects.

• Fix loop.sock_recv(), loop.sock_sendall(), loop.sock_recv_into(),
  and loop.sock_connect() to correctly handle Task.cancel().

• Better handle immediate cancellation of loop.create_connection().

• Make unit tests stricter: ensure loop.call_exception_handler()
  does not get called, unless it's expected.

TCP & UDP Transports

• transport.get_extra_info('socket') now returns a socket-like
  object. It supports socket methods like setsockopts(), but
  prohibits send(), recv(), close() and any other calls that
  can interfere with the transport that ultimately owns this file
  descriptor.

• TCP_NODELAY is used by default for all TCP connections.

• Make Transport.resume_reading() and pause_reading() idempotent.
  This will match asyncio in Python 3.7. Issue #93.

• loop.create_server() keeps a strong reference to the Server
  object it returns until its closed. Fixes #81.

• Fix loop.connect_accepted_socket() to return correct SSL
  transport.

• The UDP transport layer was rewritten from scratch. Now it uses
  uv_poll_* libuv APIs, instead of high-level uv_udp_* ones.
  This could mean a slight performance regression, and will be
  reverted when we port uvloop to Windows. For now this is
  the only viable option to make uvloop fully compatible with asyncio.
  When libuv gets an API to connect UDP sockets, uv_udp_connect(),
  we'll be able to switch to a better UDP implementation. Issue #109.

• UDPTransport.sendto(data, addr) will raise an exception if
  addr requires a name resolution. Issue #91.

Low-level sockets

• loop.add_reader() and loop.add_writer() accept file-like
  objects. Issue #97.

• loop.sock_connect() supports 4 element address tuples for
  IPv6 sockets. Issue #99.

• Protect sockets from closing while they are in use by
  loop.sock_*() methods. Close all reader/writer sockets the
  loop owns when it closes. Issue #100.

Other event loop APIs

• loop.run_until_complete() cleans up done callbacks in all
  situations. By @jimmylai.
  See also Python issue: https://bugs.python.org/issue30423.

• New uv_loop_fork() libuv API is used in loop.subprocess_shell()
  and loop.subprocess_exec() making them more stable. Issue #39.

• loop.call_later() accepts infinite time float('inf').
  Issue #102.

• loop.subprocess_exec() accepts pathlib.Path objects for its
  cwd parameter. Issue #90.

• Support pathlib.Path objects in loop.create_unix_connection()
  and loop.create_unix_server().

• Try removing existing stale Unix socket paths in
  loop.create_unix_server().

• ascii encoding is tried before encoding with idna.
  Issue #95.

• Fix slow_callback_duration repr in warnings for callback handles
  and Tasks. Issue #103.

Python 3.7

Some APIs that will be available in Python 3.7 in vanilla asyncio,
but can be used with uvloop today.

• Implement .cancelled() method for callback and timer handles.

• Add Transport.is_reading().

• Implement loop.sock_recv_into().

• Python 3.7.0a1 is now supported. Issue #110.

Miscellaneous

• Drop custom uvloop Future and Task implementations. This means
  that there will be a tiny performance regression for Python 3.5
  deploys.

• Limit stack traces in debug mode to make it faster.

• signal.siginterrupt is now used by signals machinery to let
  system calls to be repeated by default, instead of raising an
  EINTR.

Build

• libuv in uvloop has been upgraded from v1.11.0 to v1.17.0. Aside
  from bug fixes and performance improvements, libuv survives
  fork.

• LIBUV_CONFIGURE_HOST environment variable can be used to
  cross-compile uvloop/libuv. By @cmcqueen, for issue #104.

• Cyhton was upgraded from 0.25.2 to 0.27.3.

• uvloop binary is linked with pthread. By @frederikaalund,
  for issue #87.