1 files changed, 45 insertions, 0 deletions
diff --git a/Lib/test/test_importlib/threaded_import_hangers.py b/Lib/test/test_importlib/threaded_import_hangers.py
new file mode 100644
index 0000000..5484e60
--- /dev/null
+++ b/Lib/test/test_importlib/threaded_import_hangers.py
@@ -0,0 +1,45 @@
+# This is a helper module for test_threaded_import.  The test imports this
+# module, and this module tries to run various Python library functions in
+# their own thread, as a side effect of being imported.  If the spawned
+# thread doesn't complete in TIMEOUT seconds, an "appeared to hang" message
+# is appended to the module-global `errors` list.  That list remains empty
+# if (and only if) all functions tested complete.
+
+TIMEOUT = 10
+
+import threading
+
+import tempfile
+import os.path
+
+errors = []
+
+# This class merely runs a function in its own thread T.  The thread importing
+# this module holds the import lock, so if the function called by T tries
+# to do its own imports it will block waiting for this module's import
+# to complete.
+class Worker(threading.Thread):
+    def __init__(self, function, args):
+        threading.Thread.__init__(self)
+        self.function = function
+        self.args = args
+
+    def run(self):
+        self.function(*self.args)
+
+for name, func, args in [
+        # Bug 147376:  TemporaryFile hung on Windows, starting in Python 2.4.
+        ("tempfile.TemporaryFile", lambda: tempfile.TemporaryFile().close(), ()),
+
+        # The real cause for bug 147376:  ntpath.abspath() caused the hang.
+        ("os.path.abspath", os.path.abspath, ('.',)),
+        ]:
+
+    try:
+        t = Worker(func, args)
+        t.start()
+        t.join(TIMEOUT)
+        if t.is_alive():
+            errors.append("%s appeared to hang" % name)
+    finally:
+        del t