Fixed trio task groups being prematurely set inactive

Fixes nedbat#11.
agronholm · Oct 14, 2018 · cdfb1c1 · cdfb1c1
1 parent a7faacd
commit cdfb1c1
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Showing 2 changed files with 11 additions and 1 deletion.
diff --git a/anyio/_backends/trio.py b/anyio/_backends/trio.py
@@ -87,10 +87,11 @@ async def create_task_group():
         async with trio.open_nursery() as nursery:
             tg = TaskGroup(nursery)
             await yield_(tg)
-            tg._active = False
     except trio.MultiError as exc:
         raise ExceptionGroup(exc.exceptions) from None
 
+    tg._active = False
+
 
 #
 # Threads

diff --git a/tests/test_taskgroups.py b/tests/test_taskgroups.py
@@ -58,6 +58,15 @@ async def testfunc():
         run_func(testfunc)
 
 
+@pytest.mark.anyio
+async def test_spawn_while_running():
+    async def task_func():
+        await tg.spawn(sleep, 0)
+
+    async with create_task_group() as tg:
+        await tg.spawn(task_func)
+
+
 @pytest.mark.anyio
 async def test_host_exception():
     async def set_result(value):