Add thread name prefix to the default thread pool executor

tests/test_base.py

@@ -869,6 +869,21 @@ def test_loop_call_later_handle_when_after_fired(self):
         self.loop.run_until_complete(fut)
         self.assertEqual(handle.when(), when)
 
+    def test_thread_name_prefix_in_default_executor(self):
+        called = []
+
+        def cb():
+            called.append(threading.current_thread().name)
+
+        async def runner():
+            await self.loop.run_in_executor(None, cb)
+
+        self.loop.run_until_complete(runner())
+
+        self.assertEqual(len(called), 1)
+        self.assertTrue(called[0] is not None)
+        self.assertTrue(called[0].startswith("uvloop"))
+
 
 class TestBaseAIO(_TestBase, AIOTestCase):
     pass

uvloop/loop.pyx

@@ -2741,7 +2741,7 @@ cdef class Loop:
             # Only check when the default executor is being used
             self._check_default_executor()
             if executor is None:
-                executor = cc_ThreadPoolExecutor()
+                executor = cc_ThreadPoolExecutor(thread_name_prefix='uvloop')
                 self._default_executor = executor
 
         return aio_wrap_future(executor.submit(func, *args), loop=self)