Merge pull request #2257 from pquentin/release-0.20.0

python-trio · Feb 21, 2022 · 5e2a74e · 5e2a74e
2 parents 6843f34 + a60054a
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diff --git a/docs/source/history.rst b/docs/source/history.rst
@@ -5,6 +5,45 @@ Release history
 
 .. towncrier release notes start
 
+Trio 0.20.0 (2022-02-21)
+------------------------
+
+Features
+~~~~~~~~
+
+- You can now conveniently spawn a child process in a background task
+  and interact it with on the fly using ``process = await
+  nursery.start(run_process, ...)``. See `run_process` for more details.
+  We recommend most users switch to this new API. Also note that:
+
+  - ``trio.open_process`` has been deprecated in favor of
+    `trio.lowlevel.open_process`,
+  - The ``aclose`` method on `Process` has been deprecated along with
+    ``async with process_obj``. (`#1104 <https://github.com/python-trio/trio/issues/1104>`__)
+- Now context variables set with `contextvars` are preserved when running functions
+  in a worker thread with `trio.to_thread.run_sync`, or when running
+  functions from the worker thread in the parent Trio thread with
+  `trio.from_thread.run`, and `trio.from_thread.run_sync`.
+  This is done by automatically copying the `contextvars` context.
+  `trio.lowlevel.spawn_system_task` now also receives an optional ``context`` argument. (`#2160 <https://github.com/python-trio/trio/issues/2160>`__)
+
+
+Bugfixes
+~~~~~~~~
+
+- Trio now avoids creating cyclic garbage when a `MultiError` is generated and filtered,
+  including invisibly within the cancellation system.  This means errors raised
+  through nurseries and cancel scopes should result in less GC latency. (`#2063 <https://github.com/python-trio/trio/issues/2063>`__)
+- Trio now deterministically cleans up file descriptors that were opened before
+  subprocess creation fails. Previously, they would remain open until the next run of
+  the garbage collector. (`#2193 <https://github.com/python-trio/trio/issues/2193>`__)
+- Add compatibility with OpenSSL 3.0 on newer Python and PyPy versions by working
+  around ``SSLEOFError`` not being raised properly. (`#2203 <https://github.com/python-trio/trio/issues/2203>`__)
+- Fix a bug that could cause `Process.wait` to hang on Linux systems using pidfds, if
+  another task were to access `Process.returncode` after the process exited but before
+  ``wait`` woke up (`#2209 <https://github.com/python-trio/trio/issues/2209>`__)
+
+
 Trio 0.19.0 (2021-06-15)
 ------------------------
 

diff --git a/newsfragments/1104.feature.rst b/newsfragments/1104.feature.rst
diff --git a/newsfragments/2063.bugfix.rst b/newsfragments/2063.bugfix.rst
diff --git a/newsfragments/2160.feature.rst b/newsfragments/2160.feature.rst
diff --git a/newsfragments/2193.bugfix.rst b/newsfragments/2193.bugfix.rst
diff --git a/newsfragments/2203.bugfix.rst b/newsfragments/2203.bugfix.rst
diff --git a/newsfragments/2209.bugfix.rst b/newsfragments/2209.bugfix.rst
diff --git a/trio/_version.py b/trio/_version.py
@@ -1,3 +1,3 @@
 # This file is imported from __init__.py and exec'd from setup.py
 
-__version__ = "0.19.0+dev"
+__version__ = "0.20.0+dev"