fix PermissionError due to accessing pthreads upon importing trio (#2693

) * fix PermissionError due to accessing pthreads upon importing trio * fix codecov * add newsfragment
python-trio · Jul 11, 2023 · 1687f5d · 1687f5d
1 parent 6d71047
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diff --git a/newsfragments/2688.bugfix.rst b/newsfragments/2688.bugfix.rst
@@ -0,0 +1 @@
+Fix ``PermissionError`` when importing `trio` due to trying to access ``pthread``.
diff --git a/trio/_core/_thread_cache.py b/trio/_core/_thread_cache.py
@@ -39,7 +39,14 @@ def darwin_namefunc(
     libpthread_path = ctypes.util.find_library("pthread")
     if not libpthread_path:
         return None
-    libpthread = ctypes.CDLL(libpthread_path)
+
+    # Sometimes windows can find the path, but gives a permission error when
+    # accessing it. Catching a wider exception in case of more esoteric errors.
+    # https://github.com/python-trio/trio/issues/2688
+    try:
+        libpthread = ctypes.CDLL(libpthread_path)
+    except Exception:  # pragma: no cover
+        return None
 
     # get the setname method from it
     # afaik this should never fail