Fixed TaskGroup and CancelScope exit issues on asyncio (#774)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Ganden Schaffner <[email protected]>

Author: 3 people

.github/workflows/test.yml

@@ -61,14 +61,14 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", pypy-3.10]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", pypy-3.10]
         include:
         - os: macos-latest
-          python-version: "3.8"
+          python-version: "3.9"
         - os: macos-latest
           python-version: "3.12"
         - os: windows-latest
-          python-version: "3.8"
+          python-version: "3.9"
         - os: windows-latest
           python-version: "3.12"
     runs-on: ${{ matrix.os }}

docs/versionhistory.rst

@@ -3,6 +3,22 @@ Version history
 
 This library adheres to `Semantic Versioning 2.0 <http://semver.org/>`_.
 
+**UNRELEASED**
+
+- Dropped support for Python 3.8
+  (as `#698 <https://github.com/agronholm/anyio/issues/698>`_ cannot be resolved
+  without cancel message support)
+- Fixed 100% CPU use on asyncio while waiting for an exiting task group to finish while
+  said task group is within a cancelled cancel scope
+  (`#695 <https://github.com/agronholm/anyio/issues/695>`_)
+- Fixed cancel scopes on asyncio not reraising ``CancelledError`` on exit while the
+  enclosing cancel scope has been effectively cancelled
+  (`#698 <https://github.com/agronholm/anyio/issues/698>`_)
+- Fixed asyncio task groups not yielding control to the event loop at exit if there were
+  no child tasks to wait on
+- Fixed inconsistent task uncancellation with asyncio cancel scopes belonging to a
+  task group when said task group has child tasks running
+
 **4.5.0**
 
 - Improved the performance of ``anyio.Lock`` and ``anyio.Semaphore`` on asyncio (even up

pyproject.toml

@@ -19,14 +19,13 @@ classifiers = [
     "Typing :: Typed",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
 ]
-requires-python = ">= 3.8"
+requires-python = ">= 3.9"
 dependencies = [
     "exceptiongroup >= 1.0.2; python_version < '3.11'",
     "idna >= 2.8",
@@ -128,7 +127,7 @@ show_missing = true
 [tool.tox]
 legacy_tox_ini = """
 [tox]
-envlist = pre-commit, py38, py39, py310, py311, py312, py313, pypy3
+envlist = pre-commit, py39, py310, py311, py312, py313, pypy3
 skip_missing_interpreters = true
 minversion = 4.0.0