[3.6] bpo-30106: Fix test_asyncore.test_quick_connect() (#1336)

* Fix/optimize test_asyncore.test_quick_connect() (#1188)

Don't use addCleanup() in test_quick_connect() because it keeps the
Thread object alive and so @reap_threads fails on its timeout of 1
second. "./python -m test -v test_asyncore -m test_quick_connect"
now takes 185 ms, instead of 11 seconds.

Other minor changes:

* Use "with sock:" to close the socket instead of
  try/finally: sock.close()
* Use self.skipTest() in test_quick_connect() to remove one
  indentation level and notice user that the test is specific to
  AF_INET and AF_INET6

* bpo-30106: Fix tearDown() of test_asyncore (#1194)

Call asyncore.close_all() with ignore_all=True in the tearDown()
method of the test_asyncore base test case. It should prevent keeping
alive sockets in asyncore.socket_map if close() fails with an
unexpected error.

Revert also an unwanted change of my previous commit: remove name
parameter of Thread in test_quick_connect().

* bpo-30106: Fix test_asyncore.test_quick_connect() (#1234)

test_quick_connect() runs a thread up to 50 seconds, whereas the
socket is connected in 0.2 second and then the thread is expected to
end in less than 3 second. On Linux, the thread ends quickly because
select() seems to always return quickly. On FreeBSD, sometimes
select() fails with timeout and so the thread runs much longer than
expected.

Fix the thread timeout to fix a race condition in the test.

Lib/test/test_asyncore.py

@@ -502,7 +502,7 @@ class BaseClient(BaseTestHandler):
 class BaseTestAPI:
 
     def tearDown(self):
-        asyncore.close_all()
+        asyncore.close_all(ignore_all=True)
 
     def loop_waiting_for_flag(self, instance, timeout=5):
         timeout = float(timeout) / 100
@@ -755,7 +755,8 @@ class BaseTestAPI:
     def test_set_reuse_addr(self):
         if HAS_UNIX_SOCKETS and self.family == socket.AF_UNIX:
             self.skipTest("Not applicable to AF_UNIX sockets.")
-        sock = socket.socket(self.family)
+
+        with socket.socket(self.family) as sock:
             try:
                 sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
             except OSError:
@@ -771,34 +772,33 @@ class BaseTestAPI:
                 s.set_reuse_addr()
                 self.assertTrue(s.socket.getsockopt(socket.SOL_SOCKET,
                                                      socket.SO_REUSEADDR))
-        finally:
-            sock.close()
 
     @unittest.skipUnless(threading, 'Threading required for this test.')
     @support.reap_threads
     def test_quick_connect(self):
         # see: http://bugs.python.org/issue10340
-        if self.family in (socket.AF_INET, getattr(socket, "AF_INET6", object())):
+        if self.family not in (socket.AF_INET, getattr(socket, "AF_INET6", object())):
+            self.skipTest("test specific to AF_INET and AF_INET6")
+
         server = BaseServer(self.family, self.addr)
+        # run the thread 500 ms: the socket should be connected in 200 ms
         t = threading.Thread(target=lambda: asyncore.loop(timeout=0.1,
-                                                              count=500))
+                                                          count=5))
         t.start()
-            def cleanup():
-                t.join(timeout=TIMEOUT)
-                if t.is_alive():
-                    self.fail("join() timed out")
-            self.addCleanup(cleanup)
-
-            s = socket.socket(self.family, socket.SOCK_STREAM)
+        try:
+            with socket.socket(self.family, socket.SOCK_STREAM) as s:
                 s.settimeout(.2)
                 s.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER,
                              struct.pack('ii', 1, 0))
+
                 try:
                     s.connect(server.address)
                 except OSError:
                     pass
         finally:
-                s.close()
+            t.join(timeout=TIMEOUT)
+            if t.is_alive():
+                self.fail("join() timed out")
 
 class TestAPI_UseIPv4Sockets(BaseTestAPI):
     family = socket.AF_INET