diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index 03935ea..af66c0a 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -115,24 +115,16 @@
 
     if port is None:
         port = 0
-    elif isinstance(port, bytes):
-        if port == b'':
-            port = 0
-        else:
-            try:
-                port = int(port)
-            except ValueError:
-                # Might be a service name like b"http".
-                port = socket.getservbyname(port.decode('ascii'))
-    elif isinstance(port, str):
-        if port == '':
-            port = 0
-        else:
-            try:
-                port = int(port)
-            except ValueError:
-                # Might be a service name like "http".
-                port = socket.getservbyname(port)
+    elif isinstance(port, bytes) and port == b'':
+        port = 0
+    elif isinstance(port, str) and port == '':
+        port = 0
+    else:
+        # If port's a service name like "http", don't skip getaddrinfo.
+        try:
+            port = int(port)
+        except (TypeError, ValueError):
+            return None
 
     if family == socket.AF_UNSPEC:
         afs = [socket.AF_INET, socket.AF_INET6]
diff --git a/Lib/asyncio/base_subprocess.py b/Lib/asyncio/base_subprocess.py
index bcc481d..23742a1 100644
--- a/Lib/asyncio/base_subprocess.py
+++ b/Lib/asyncio/base_subprocess.py
@@ -3,7 +3,6 @@
 import warnings
 
 from . import compat
-from . import futures
 from . import protocols
 from . import transports
 from .coroutines import coroutine
diff --git a/Lib/asyncio/coroutines.py b/Lib/asyncio/coroutines.py
index e013d64..5cecc76 100644
--- a/Lib/asyncio/coroutines.py
+++ b/Lib/asyncio/coroutines.py
@@ -120,8 +120,8 @@
         def send(self, value):
             return self.gen.send(value)
 
-    def throw(self, exc):
-        return self.gen.throw(exc)
+    def throw(self, type, value=None, traceback=None):
+        return self.gen.throw(type, value, traceback)
 
     def close(self):
         return self.gen.close()
diff --git a/Lib/asyncio/queues.py b/Lib/asyncio/queues.py
index c453f02..2d38972 100644
--- a/Lib/asyncio/queues.py
+++ b/Lib/asyncio/queues.py
@@ -7,7 +7,6 @@
 
 from . import compat
 from . import events
-from . import futures
 from . import locks
 from .coroutines import coroutine
 
diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index 4c66546..f735b44 100644
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -594,6 +594,10 @@
     """Return a future aggregating results from the given coroutines
     or futures.
 
+    Coroutines will be wrapped in a future and scheduled in the event
+    loop. They will not necessarily be scheduled in the same order as
+    passed in.
+
     All futures must share the same event loop.  If all the tasks are
     done successfully, the returned future's result is the list of
     results (in the order of the original sequence, not necessarily
diff --git a/Lib/test/test_asyncio/test_base_events.py b/Lib/test/test_asyncio/test_base_events.py
index 43ebdc8..e86b74e 100644
--- a/Lib/test/test_asyncio/test_base_events.py
+++ b/Lib/test/test_asyncio/test_base_events.py
@@ -142,26 +142,6 @@
             (INET, STREAM, TCP, '', ('1.2.3.4', 1)),
             base_events._ipaddr_info('1.2.3.4', b'1', INET, STREAM, TCP))
 
-    def test_getaddrinfo_servname(self):
-        INET = socket.AF_INET
-        STREAM = socket.SOCK_STREAM
-        TCP = socket.IPPROTO_TCP
-
-        self.assertEqual(
-            (INET, STREAM, TCP, '', ('1.2.3.4', 80)),
-            base_events._ipaddr_info('1.2.3.4', 'http', INET, STREAM, TCP))
-
-        self.assertEqual(
-            (INET, STREAM, TCP, '', ('1.2.3.4', 80)),
-            base_events._ipaddr_info('1.2.3.4', b'http', INET, STREAM, TCP))
-
-        # Raises "service/proto not found".
-        with self.assertRaises(OSError):
-            base_events._ipaddr_info('1.2.3.4', 'nonsense', INET, STREAM, TCP)
-
-        with self.assertRaises(OSError):
-            base_events._ipaddr_info('1.2.3.4', 'nonsense', INET, STREAM, TCP)
-
     @patch_socket
     def test_ipaddr_info_no_inet_pton(self, m_socket):
         del m_socket.inet_pton
@@ -1209,6 +1189,37 @@
     def test_create_connection_no_inet_pton(self, m_socket):
         self._test_create_connection_ip_addr(m_socket, False)
 
+    @patch_socket
+    def test_create_connection_service_name(self, m_socket):
+        m_socket.getaddrinfo = socket.getaddrinfo
+        sock = m_socket.socket.return_value
+
+        self.loop.add_reader = mock.Mock()
+        self.loop.add_reader._is_coroutine = False
+        self.loop.add_writer = mock.Mock()
+        self.loop.add_writer._is_coroutine = False
+
+        for service, port in ('http', 80), (b'http', 80):
+            coro = self.loop.create_connection(asyncio.Protocol,
+                                               '127.0.0.1', service)
+
+            t, p = self.loop.run_until_complete(coro)
+            try:
+                sock.connect.assert_called_with(('127.0.0.1', port))
+                _, kwargs = m_socket.socket.call_args
+                self.assertEqual(kwargs['family'], m_socket.AF_INET)
+                self.assertEqual(kwargs['type'], m_socket.SOCK_STREAM)
+            finally:
+                t.close()
+                test_utils.run_briefly(self.loop)  # allow transport to close
+
+        for service in 'nonsense', b'nonsense':
+            coro = self.loop.create_connection(asyncio.Protocol,
+                                               '127.0.0.1', service)
+
+            with self.assertRaises(OSError):
+                self.loop.run_until_complete(coro)
+
     def test_create_connection_no_local_addr(self):
         @asyncio.coroutine
         def getaddrinfo(host, *args, **kw):
diff --git a/Lib/test/test_asyncio/test_selector_events.py b/Lib/test/test_asyncio/test_selector_events.py
index 8b621bf..0c26a87 100644
--- a/Lib/test/test_asyncio/test_selector_events.py
+++ b/Lib/test/test_asyncio/test_selector_events.py
@@ -2,6 +2,8 @@
 
 import errno
 import socket
+import threading
+import time
 import unittest
 from unittest import mock
 try:
@@ -1784,5 +1786,89 @@
                 'Fatal error on transport\nprotocol:.*\ntransport:.*'),
             exc_info=(ConnectionRefusedError, MOCK_ANY, MOCK_ANY))
 
+
+class SelectorLoopFunctionalTests(unittest.TestCase):
+
+    def setUp(self):
+        self.loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(None)
+
+    def tearDown(self):
+        self.loop.close()
+
+    @asyncio.coroutine
+    def recv_all(self, sock, nbytes):
+        buf = b''
+        while len(buf) < nbytes:
+            buf += yield from self.loop.sock_recv(sock, nbytes - len(buf))
+        return buf
+
+    def test_sock_connect_sock_write_race(self):
+        TIMEOUT = 3.0
+        PAYLOAD = b'DATA' * 1024 * 1024
+
+        class Server(threading.Thread):
+            def __init__(self, *args, srv_sock, **kwargs):
+                super().__init__(*args, **kwargs)
+                self.srv_sock = srv_sock
+
+            def run(self):
+                with self.srv_sock:
+                    srv_sock.listen(100)
+
+                    sock, addr = self.srv_sock.accept()
+                    sock.settimeout(TIMEOUT)
+
+                    with sock:
+                        sock.sendall(b'helo')
+
+                        buf = bytearray()
+                        while len(buf) < len(PAYLOAD):
+                            pack = sock.recv(1024 * 65)
+                            if not pack:
+                                break
+                            buf.extend(pack)
+
+        @asyncio.coroutine
+        def client(addr):
+            sock = socket.socket()
+            with sock:
+                sock.setblocking(False)
+
+                started = time.monotonic()
+                while True:
+                    if time.monotonic() - started > TIMEOUT:
+                        self.fail('unable to connect to the socket')
+                        return
+                    try:
+                        yield from self.loop.sock_connect(sock, addr)
+                    except OSError:
+                        yield from asyncio.sleep(0.05, loop=self.loop)
+                    else:
+                        break
+
+                # Give 'Server' thread a chance to accept and send b'helo'
+                time.sleep(0.1)
+
+                data = yield from self.recv_all(sock, 4)
+                self.assertEqual(data, b'helo')
+                yield from self.loop.sock_sendall(sock, PAYLOAD)
+
+        srv_sock = socket.socket()
+        srv_sock.settimeout(TIMEOUT)
+        srv_sock.bind(('127.0.0.1', 0))
+        srv_addr = srv_sock.getsockname()
+
+        srv = Server(srv_sock=srv_sock, daemon=True)
+        srv.start()
+
+        try:
+            self.loop.run_until_complete(
+                asyncio.wait_for(client(srv_addr), loop=self.loop,
+                                 timeout=TIMEOUT))
+        finally:
+            srv.join()
+
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/Lib/test/test_asyncio/test_tasks.py b/Lib/test/test_asyncio/test_tasks.py
index e7fb774..2863c42 100644
--- a/Lib/test/test_asyncio/test_tasks.py
+++ b/Lib/test/test_asyncio/test_tasks.py
@@ -1723,6 +1723,37 @@
         wd['cw'] = cw  # Would fail without __weakref__ slot.
         cw.gen = None  # Suppress warning from __del__.
 
+    def test_corowrapper_throw(self):
+        # Issue 429: CoroWrapper.throw must be compatible with gen.throw
+        def foo():
+            value = None
+            while True:
+                try:
+                    value = yield value
+                except Exception as e:
+                    value = e
+
+        exception = Exception("foo")
+        cw = asyncio.coroutines.CoroWrapper(foo())
+        cw.send(None)
+        self.assertIs(exception, cw.throw(exception))
+
+        cw = asyncio.coroutines.CoroWrapper(foo())
+        cw.send(None)
+        self.assertIs(exception, cw.throw(Exception, exception))
+
+        cw = asyncio.coroutines.CoroWrapper(foo())
+        cw.send(None)
+        exception = cw.throw(Exception, "foo")
+        self.assertIsInstance(exception, Exception)
+        self.assertEqual(exception.args, ("foo", ))
+
+        cw = asyncio.coroutines.CoroWrapper(foo())
+        cw.send(None)
+        exception = cw.throw(Exception, "foo", None)
+        self.assertIsInstance(exception, Exception)
+        self.assertEqual(exception.args, ("foo", ))
+
     @unittest.skipUnless(PY34,
                          'need python 3.4 or later')
     def test_log_destroyed_pending_task(self):