Pre-allocate the (biggec) data before we start taking timing measurements, and...

Pre-allocate the (biggec) data before we start taking timing measurements, and be sure to close the socket when done.

greentest/test__socket.py

@@ -146,17 +146,19 @@ class TestTCP(greentest.TestCase):
     if sys.platform != 'win32':
 
         def test_sendall_timeout(self):
+            data_sent = b'h' * 2000000
             client_sock = []
             acceptor = Thread(target=lambda: client_sock.append(self.listener.accept()))
             client = self.create_connection()
             time.sleep(0.1)
             assert client_sock
             client.settimeout(0.1)
-            data_sent = b'h' * 1000000
             start = time.time()
+            try:
                 self.assertRaises(self.TIMEOUT_ERROR, client.sendall, data_sent)
                 took = time.time() - start
                 assert 0.1 - 0.01 <= took <= 0.1 + 0.1, took
+            finally:
                 acceptor.join()
                 client.close()
                 client_sock[0][0].close()