Python threading.Thread() Examples

def auto(self, start_message, end_message):
        """
        Auto progress.
        """
        self._auto_running = threading.Event()
        self._auto_thread = threading.Thread(target=self._spin)

        self.start(start_message)
        self._auto_thread.start()

        try:
            yield self
        except (Exception, KeyboardInterrupt):
            self._io.error_line("")

            self._auto_running.set()
            self._auto_thread.join()

            raise

        self.finish(end_message, reset_indicator=True) 

def CheckConCursor(self):
        def run(con, errors):
            try:
                cur = con.cursor()
                errors.append("did not raise ProgrammingError")
                return
            except sqlite.ProgrammingError:
                return
            except:
                errors.append("raised wrong exception")

        errors = []
        t = threading.Thread(target=run, kwargs={"con": self.con, "errors": errors})
        t.start()
        t.join()
        if len(errors) > 0:
            self.fail("\n".join(errors)) 

def CheckConCommit(self):
        def run(con, errors):
            try:
                con.commit()
                errors.append("did not raise ProgrammingError")
                return
            except sqlite.ProgrammingError:
                return
            except:
                errors.append("raised wrong exception")

        errors = []
        t = threading.Thread(target=run, kwargs={"con": self.con, "errors": errors})
        t.start()
        t.join()
        if len(errors) > 0:
            self.fail("\n".join(errors)) 

def CheckConRollback(self):
        def run(con, errors):
            try:
                con.rollback()
                errors.append("did not raise ProgrammingError")
                return
            except sqlite.ProgrammingError:
                return
            except:
                errors.append("raised wrong exception")

        errors = []
        t = threading.Thread(target=run, kwargs={"con": self.con, "errors": errors})
        t.start()
        t.join()
        if len(errors) > 0:
            self.fail("\n".join(errors)) 

def CheckCurImplicitBegin(self):
        def run(cur, errors):
            try:
                cur.execute("insert into test(name) values ('a')")
                errors.append("did not raise ProgrammingError")
                return
            except sqlite.ProgrammingError:
                return
            except:
                errors.append("raised wrong exception")

        errors = []
        t = threading.Thread(target=run, kwargs={"cur": self.cur, "errors": errors})
        t.start()
        t.join()
        if len(errors) > 0:
            self.fail("\n".join(errors)) 

def CheckCurClose(self):
        def run(cur, errors):
            try:
                cur.close()
                errors.append("did not raise ProgrammingError")
                return
            except sqlite.ProgrammingError:
                return
            except:
                errors.append("raised wrong exception")

        errors = []
        t = threading.Thread(target=run, kwargs={"cur": self.cur, "errors": errors})
        t.start()
        t.join()
        if len(errors) > 0:
            self.fail("\n".join(errors)) 

def CheckCurExecute(self):
        def run(cur, errors):
            try:
                cur.execute("select name from test")
                errors.append("did not raise ProgrammingError")
                return
            except sqlite.ProgrammingError:
                return
            except:
                errors.append("raised wrong exception")

        errors = []
        self.cur.execute("insert into test(name) values ('a')")
        t = threading.Thread(target=run, kwargs={"cur": self.cur, "errors": errors})
        t.start()
        t.join()
        if len(errors) > 0:
            self.fail("\n".join(errors)) 

def CheckCurIterNext(self):
        def run(cur, errors):
            try:
                row = cur.fetchone()
                errors.append("did not raise ProgrammingError")
                return
            except sqlite.ProgrammingError:
                return
            except:
                errors.append("raised wrong exception")

        errors = []
        self.cur.execute("insert into test(name) values ('a')")
        self.cur.execute("select name from test")
        t = threading.Thread(target=run, kwargs={"cur": self.cur, "errors": errors})
        t.start()
        t.join()
        if len(errors) > 0:
            self.fail("\n".join(errors)) 

def test_threads_write(self):
        # Issue6750: concurrent writes could duplicate data
        event = threading.Event()
        with self.open(support.TESTFN, "w", buffering=1) as f:
            def run(n):
                text = "Thread%03d\n" % n
                event.wait()
                f.write(text)
            threads = [threading.Thread(target=lambda n=x: run(n))
                       for x in range(20)]
            for t in threads:
                t.start()
            time.sleep(0.02)
            event.set()
            for t in threads:
                t.join()
        with self.open(support.TESTFN) as f:
            content = f.read()
            for n in range(20):
                self.assertEqual(content.count("Thread%03d\n" % n), 1) 

def test_join_nondaemon_on_shutdown(self):
        # Issue 1722344
        # Raising SystemExit skipped threading._shutdown
        p = subprocess.Popen([sys.executable, "-c", """if 1:
                import threading
                from time import sleep

                def child():
                    sleep(1)
                    # As a non-daemon thread we SHOULD wake up and nothing
                    # should be torn down yet
                    print "Woke up, sleep function is:", sleep

                threading.Thread(target=child).start()
                raise SystemExit
            """],
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE)
        self.addCleanup(p.stdout.close)
        self.addCleanup(p.stderr.close)
        stdout, stderr = p.communicate()
        self.assertEqual(stdout.strip(),
            "Woke up, sleep function is: <built-in function sleep>")
        stderr = re.sub(r"^\[\d+ refs\]", "", stderr, re.MULTILINE).strip()
        self.assertEqual(stderr, "") 

def test_is_alive_after_fork(self):
        # Try hard to trigger #18418: is_alive() could sometimes be True on
        # threads that vanished after a fork.
        old_interval = sys.getcheckinterval()

        # Make the bug more likely to manifest.
        sys.setcheckinterval(10)

        try:
            for i in range(20):
                t = threading.Thread(target=lambda: None)
                t.start()
                pid = os.fork()
                if pid == 0:
                    os._exit(1 if t.is_alive() else 0)
                else:
                    t.join()
                    pid, status = os.waitpid(pid, 0)
                    self.assertEqual(0, status)
        finally:
            sys.setcheckinterval(old_interval) 

def test_BoundedSemaphore_limit(self):
        # BoundedSemaphore should raise ValueError if released too often.
        for limit in range(1, 10):
            bs = threading.BoundedSemaphore(limit)
            threads = [threading.Thread(target=bs.acquire)
                       for _ in range(limit)]
            for t in threads:
                t.start()
            for t in threads:
                t.join()
            threads = [threading.Thread(target=bs.release)
                       for _ in range(limit)]
            for t in threads:
                t.start()
            for t in threads:
                t.join()
            self.assertRaises(ValueError, bs.release) 

def test_reinit_tls_after_fork(self):
        # Issue #13817: fork() would deadlock in a multithreaded program with
        # the ad-hoc TLS implementation.

        def do_fork_and_wait():
            # just fork a child process and wait it
            pid = os.fork()
            if pid > 0:
                os.waitpid(pid, 0)
            else:
                os._exit(0)

        # start a bunch of threads that will fork() child processes
        threads = []
        for i in range(16):
            t = threading.Thread(target=do_fork_and_wait)
            threads.append(t)
            t.start()

        for t in threads:
            t.join() 

def test_print_exception_stderr_is_none_2(self):
        script = r"""if 1:
            import sys
            import threading
            import time

            running = False
            def run():
                global running
                running = True
                while running:
                    time.sleep(0.01)
                1/0
            sys.stderr = None
            t = threading.Thread(target=run)
            t.start()
            while not running:
                time.sleep(0.01)
            running = False
            t.join()
            """
        rc, out, err = assert_python_ok("-c", script)
        self.assertEqual(out, '')
        self.assertNotIn("Unhandled exception", err) 

def _run_workers(self, func, nb_workers, duration=0.2):
        with self._count_lock:
            self.close_count = 0
            self.close_success_count = 0
        self.do_continue = True
        threads = []
        try:
            for i in range(nb_workers):
                t = threading.Thread(target=func)
                t.start()
                threads.append(t)
            for _ in xrange(100):
                time.sleep(duration/100)
                with self._count_lock:
                    if self.close_count-self.close_success_count > nb_workers+1:
                        if test_support.verbose:
                            print 'Q',
                        break
            time.sleep(duration)
        finally:
            self.do_continue = False
            for t in threads:
                t.join() 

def test_shutdown(self):
        # Issue #2302: shutdown() should always succeed in making an
        # other thread leave serve_forever().
        class MyServer(SocketServer.TCPServer):
            pass

        class MyHandler(SocketServer.StreamRequestHandler):
            pass

        threads = []
        for i in range(20):
            s = MyServer((HOST, 0), MyHandler)
            t = threading.Thread(
                name='MyServer serving',
                target=s.serve_forever,
                kwargs={'poll_interval':0.01})
            t.daemon = True  # In case this function raises.
            threads.append((t, s))
        for t, s in threads:
            t.start()
            s.shutdown()
        for t, s in threads:
            t.join() 

def test_quick_connect(self):
        # see: http://bugs.python.org/issue10340
        server = TCPServer()
        t = threading.Thread(target=lambda: asyncore.loop(timeout=0.1, count=500))
        t.start()
        self.addCleanup(t.join)

        for x in xrange(20):
            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            s.settimeout(.2)
            s.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER,
                         struct.pack('ii', 1, 0))
            try:
                s.connect(server.address)
            except socket.error:
                pass
            finally:
                s.close() 

def test_pendingcalls_threaded(self):
        #do every callback on a separate thread
        n = 32 #total callbacks
        threads = []
        class foo(object):pass
        context = foo()
        context.l = []
        context.n = 2 #submits per thread
        context.nThreads = n // context.n
        context.nFinished = 0
        context.lock = threading.Lock()
        context.event = threading.Event()

        for i in range(context.nThreads):
            t = threading.Thread(target=self.pendingcalls_thread, args = (context,))
            t.start()
            threads.append(t)

        self.pendingcalls_wait(context.l, n, context)

        for t in threads:
            t.join() 

def test_thread_state(self):
        # some extra thread-state tests driven via _testcapi
        def target():
            idents = []

            def callback():
                idents.append(thread.get_ident())

            _testcapi._test_thread_state(callback)
            a = b = callback
            time.sleep(1)
            # Check our main thread is in the list exactly 3 times.
            self.assertEqual(idents.count(thread.get_ident()), 3,
                             "Couldn't find main thread correctly in the list")

        target()
        t = threading.Thread(target=target)
        t.start()
        t.join() 

def _get_listener():
    global _listener

    if _listener is None:
        _lock.acquire()
        try:
            if _listener is None:
                debug('starting listener and thread for sending handles')
                _listener = Listener(authkey=current_process().authkey)
                t = threading.Thread(target=_serve)
                t.daemon = True
                t.start()
        finally:
            _lock.release()

    return _listener 

def serve_forever(self):
        '''
        Run the server forever
        '''
        current_process()._manager_server = self
        try:
            try:
                while 1:
                    try:
                        c = self.listener.accept()
                    except (OSError, IOError):
                        continue
                    t = threading.Thread(target=self.handle_request, args=(c,))
                    t.daemon = True
                    t.start()
            except (KeyboardInterrupt, SystemExit):
                pass
        finally:
            self.stop = 999
            self.listener.close() 

def clear():
    s = threading.Thread(None,unicornhathd.clear)
    s.start()
    return "ok" 

def show():
    s = threading.Thread(None,unicornhathd.show)
    s.start()
    return "ok" 

def repo_server_thread(self, location_to_obj):
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.bind(('127.0.0.1', 0))
        with repo_server(sock, location_to_obj, self.storage) as httpd:
            httpd.server_activate()
            thread = threading.Thread(name='RpSrv', target=httpd.serve_forever)
            thread.start()
            try:
                yield sock.getsockname()
            finally:
                httpd.shutdown()
                thread.join()

    # This validates a GET + headers, but not any of the storage retrieval. 

def __init__(self):
        """Start the background camera thread if it isn't running yet."""
        if BaseCamera.thread is None:
            BaseCamera.last_access = time.time()

            # start background frame thread
            BaseCamera.thread = threading.Thread(target=self._thread)
            BaseCamera.thread.start()

            # wait until frames are available
            while self.get_frame() is None:
                time.sleep(0) 

def __init__(self, config, scheduler):
        super(self.__class__, self).__init__()
        self.connected = False
        self.config = config
        self.scheduler = scheduler
        logging.info('Current working directory: %s', os.getcwd())
        try:
            logging.info('Database location: %s',
                         config['Yowsup']['database'])
            self.conn = sqlite3.connect(config['Yowsup']['database'],
                                        detect_types=sqlite3.PARSE_DECLTYPES,
                                        check_same_thread=False)
            self.conn.text_factory = str
            self.cursor = self.conn.cursor()
        except KeyError:
            logging.critical('Database could not be loaded!')

        # Group list holder
        self.known_groups = []

        # Start rpc listener
        host = 'localhost'
        port = 10666
        self.rpcserver = rpc.ThreadedTCPServer((host, port), rpc.ThreadedTCPRequestHandler, self)

        server_thread = threading.Thread(target=self.rpcserver.serve_forever)
        server_thread.daemon = True
        server_thread.start()

        # Start the passed scheduler
        self.scheduler.start()

        self.functions = {}
        plugins.load_plugins()
        self.functions.update(registry.COMMAND_DICT)

        # Execute startup hooks
        registry.fire_event(registry.BOT_START, self) 

def multiGenAsm(filepath):
    count = threading.active_count()
    print '[+]count:', count

    # while (count >= ThreadMax):
    #     count = threading.active_count()
    #     print '[+]Threadcount:', count

    my_thread = threading.Thread(target=genAsm, args=(filepath, ))
    my_thread.start()
    # my_thread.join()

    if (count == ThreadMax):
        my_thread.join() 

def traveseFile(path):
    # thread1 = ''
    # thread2 = ''

    for parent, dirnames, filenames in os.walk(path):

        for filename in filenames:
            parenttype = parent.split('/')[-1]

            if(parenttype != 'fail'):
                continue

            filepath = os.path.join(parent, filename)
            print parent


            if (cleanFile(filename, filepath)):
                continue

            filepath = filepath.replace(' ', '\ ').replace('(', '\(').replace(')', '\)')
            # print filepath

            genAsm(filepath)

            # multiGenAsm(filepath)

            # my_thread = threading.Thread(target=genAsm, args=(filepath, ))
            # my_thread.start()

            # thread1 = MyThread(filename, filepath)
            # thread2 = MyThread(2, "Thread-2", 2)
            #
            # thread1.start()
            # thread2.start()
            #
            # thread1.join()
            # thread2.join() 

def __init__(self, load_batch_func, nb_workers=1, queue_size=50, threaded=True):
        self.queue = multiprocessing.Queue(queue_size)
        self.workers = []
        for i in range(nb_workers):
            if threaded:
                worker = threading.Thread(target=self._load_batches, args=(load_batch_func, self.queue))
            else:
                worker = multiprocessing.Process(target=self._load_batches, args=(load_batch_func, self.queue))
            worker.daemon = True
            worker.start()
            self.workers.append(worker) 

def __init__(self, augseq, queue_source, nb_workers, queue_size=50, threaded=False):
        assert 0 < queue_size <= 10000
        self.augseq = augseq
        self.queue_source = queue_source
        self.queue_result = multiprocessing.Queue(queue_size)
        self.workers = []
        for i in range(nb_workers):
            augseq.reseed()
            if threaded:
                worker = threading.Thread(target=self._augment_images_worker, args=(self.augseq, self.queue_source, self.queue_result))
            else:
                worker = multiprocessing.Process(target=self._augment_images_worker, args=(self.augseq, self.queue_source, self.queue_result))
            worker.daemon = True
            worker.start()
            self.workers.append(worker) 

def go(self, event=None):
        if not self.msgq:
            self.msgq = Queue.Queue(0)
            self.check_msgq()
        if not self.sucker:
            self.sucker = SuckerThread(self.msgq)
        if self.sucker.stopit:
            return
        self.url_entry.selection_range(0, END)
        url = self.url_entry.get()
        url = url.strip()
        if not url:
            self.top.bell()
            self.message("[Error: No URL entered]")
            return
        self.rooturl = url
        dir = self.dir_entry.get().strip()
        if not dir:
            self.sucker.savedir = None
        else:
            self.sucker.savedir = dir
            self.sucker.rootdir = os.path.dirname(
                websucker.Sucker.savefilename(self.sucker, url))
        self.go_button.configure(state=DISABLED)
        self.auto_button.configure(state=DISABLED)
        self.cancel_button.configure(state=NORMAL)
        self.message( '[running...]')
        self.sucker.stopit = 0
        t = threading.Thread(target=self.sucker.run1, args=(url,))
        t.start() 

def __del__(self):
        import threading

        key = object.__getattribute__(self, '_local__key')

        try:
            # We use the non-locking API since we might already hold the lock
            # (__del__ can be called at any point by the cyclic GC).
            threads = threading._enumerate()
        except:
            # If enumerating the current threads fails, as it seems to do
            # during shutdown, we'll skip cleanup under the assumption
            # that there is nothing to clean up.
            return

        for thread in threads:
            try:
                __dict__ = thread.__dict__
            except AttributeError:
                # Thread is dying, rest in peace.
                continue

            if key in __dict__:
                try:
                    del __dict__[key]
                except KeyError:
                    pass # didn't have anything in this thread 

def test_open(self):
        libc_name = find_library("c")
        if libc_name is None:
            raise unittest.SkipTest("Unable to find C library")
        libc = CDLL(libc_name, use_errno=True)
        if os.name == "nt":
            libc_open = libc._open
        else:
            libc_open = libc.open

        libc_open.argtypes = c_char_p, c_int

        self.assertEqual(libc_open("", 0), -1)
        self.assertEqual(get_errno(), errno.ENOENT)

        self.assertEqual(set_errno(32), errno.ENOENT)
        self.assertEqual(get_errno(), 32)

        if threading:
            def _worker():
                set_errno(0)

                libc = CDLL(libc_name, use_errno=False)
                if os.name == "nt":
                    libc_open = libc._open
                else:
                    libc_open = libc.open
                libc_open.argtypes = c_char_p, c_int
                self.assertEqual(libc_open("", 0), -1)
                self.assertEqual(get_errno(), 0)

            t = threading.Thread(target=_worker)
            t.start()
            t.join()

            self.assertEqual(get_errno(), 32)
            set_errno(0) 

def process_request(self, request, client_address):
        """Start a new thread to process the request."""
        t = threading.Thread(target = self.process_request_thread,
                             args = (request, client_address))
        t.daemon = self.daemon_threads
        t.start() 

def test_threads(self):
        try:
            # Write out many bytes with exactly the same number of 0's,
            # 1's... 255's. This will help us check that concurrent reading
            # doesn't duplicate or forget contents.
            N = 1000
            l = list(range(256)) * N
            random.shuffle(l)
            s = bytes(bytearray(l))
            with self.open(support.TESTFN, "wb") as f:
                f.write(s)
            with self.open(support.TESTFN, self.read_mode, buffering=0) as raw:
                bufio = self.tp(raw, 8)
                errors = []
                results = []
                def f():
                    try:
                        # Intra-buffer read then buffer-flushing read
                        for n in cycle([1, 19]):
                            s = bufio.read(n)
                            if not s:
                                break
                            # list.append() is atomic
                            results.append(s)
                    except Exception as e:
                        errors.append(e)
                        raise
                threads = [threading.Thread(target=f) for x in range(20)]
                for t in threads:
                    t.start()
                time.sleep(0.02) # yield
                for t in threads:
                    t.join()
                self.assertFalse(errors,
                    "the following exceptions were caught: %r" % errors)
                s = b''.join(results)
                for i in range(256):
                    c = bytes(bytearray([i]))
                    self.assertEqual(s.count(c), N)
        finally:
            support.unlink(support.TESTFN) 

def __init__(self, name, testcase, sema, mutex, nrunning):
        threading.Thread.__init__(self, name=name)
        self.testcase = testcase
        self.sema = sema
        self.mutex = mutex
        self.nrunning = nrunning 

def test_limbo_cleanup(self):
        # Issue 7481: Failure to start thread should cleanup the limbo map.
        def fail_new_thread(*args):
            raise thread.error()
        _start_new_thread = threading._start_new_thread
        threading._start_new_thread = fail_new_thread
        try:
            t = threading.Thread(target=lambda: None)
            self.assertRaises(thread.error, t.start)
            self.assertFalse(
                t in threading._limbo,
                "Failed to cleanup _limbo map on failure of Thread.start().")
        finally:
            threading._start_new_thread = _start_new_thread 

def test_finalize_with_trace(self):
        # Issue1733757
        # Avoid a deadlock when sys.settrace steps into threading._shutdown
        p = subprocess.Popen([sys.executable, "-c", """if 1:
            import sys, threading

            # A deadlock-killer, to prevent the
            # testsuite to hang forever
            def killer():
                import os, time
                time.sleep(2)
                print 'program blocked; aborting'
                os._exit(2)
            t = threading.Thread(target=killer)
            t.daemon = True
            t.start()

            # This is the trace function
            def func(frame, event, arg):
                threading.current_thread()
                return func

            sys.settrace(func)
            """],
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE)
        self.addCleanup(p.stdout.close)
        self.addCleanup(p.stderr.close)
        stdout, stderr = p.communicate()
        rc = p.returncode
        self.assertFalse(rc == 2, "interpreted was blocked")
        self.assertTrue(rc == 0,
                        "Unexpected error: " + repr(stderr)) 

def test_no_refcycle_through_target(self):
        class RunSelfFunction(object):
            def __init__(self, should_raise):
                # The links in this refcycle from Thread back to self
                # should be cleaned up when the thread completes.
                self.should_raise = should_raise
                self.thread = threading.Thread(target=self._run,
                                               args=(self,),
                                               kwargs={'yet_another':self})
                self.thread.start()

            def _run(self, other_ref, yet_another):
                if self.should_raise:
                    raise SystemExit

        cyclic_object = RunSelfFunction(should_raise=False)
        weak_cyclic_object = weakref.ref(cyclic_object)
        cyclic_object.thread.join()
        del cyclic_object
        self.assertEqual(None, weak_cyclic_object(),
                         msg=('%d references still around' %
                              sys.getrefcount(weak_cyclic_object())))

        raising_cyclic_object = RunSelfFunction(should_raise=True)
        weak_raising_cyclic_object = weakref.ref(raising_cyclic_object)
        raising_cyclic_object.thread.join()
        del raising_cyclic_object
        self.assertEqual(None, weak_raising_cyclic_object(),
                         msg=('%d references still around' %
                              sys.getrefcount(weak_raising_cyclic_object()))) 

def test_1_join_on_shutdown(self):
        # The usual case: on exit, wait for a non-daemon thread
        script = """if 1:
            import os
            t = threading.Thread(target=joiningfunc,
                                 args=(threading.current_thread(),))
            t.start()
            time.sleep(0.1)
            print 'end of main'
            """
        self._run_and_join(script) 

def test_2_join_in_forked_process(self):
        # Like the test above, but from a forked interpreter
        script = """if 1:
            childpid = os.fork()
            if childpid != 0:
                os.waitpid(childpid, 0)
                sys.exit(0)

            t = threading.Thread(target=joiningfunc,
                                 args=(threading.current_thread(),))
            t.start()
            print 'end of main'
            """
        self._run_and_join(script) 

def test_start_thread_again(self):
        thread = threading.Thread()
        thread.start()
        self.assertRaises(RuntimeError, thread.start) 

def test_joining_inactive_thread(self):
        thread = threading.Thread()
        self.assertRaises(RuntimeError, thread.join) 

def test_daemonize_active_thread(self):
        thread = threading.Thread()
        thread.start()
        self.assertRaises(RuntimeError, setattr, thread, "daemon", True) 

def test_print_exception_stderr_is_none_1(self):
        script = r"""if 1:
            import sys
            import threading
            import time

            running = False
            def run():
                global running
                running = True
                while running:
                    time.sleep(0.01)
                1/0
            t = threading.Thread(target=run)
            t.start()
            while not running:
                time.sleep(0.01)
            sys.stderr = None
            running = False
            t.join()
            """
        rc, out, err = assert_python_ok("-c", script)
        self.assertEqual(out, '')
        self.assertIn("Exception in thread", err)
        self.assertIn("Traceback (most recent call last):", err)
        self.assertIn("ZeroDivisionError", err)
        self.assertNotIn("Unhandled exception", err) 

def test_recursion_limit(self):
        # Issue 9670
        # test that excessive recursion within a non-main thread causes
        # an exception rather than crashing the interpreter on platforms
        # like Mac OS X or FreeBSD which have small default stack sizes
        # for threads
        script = """if True:
            import threading

            def recurse():
                return recurse()

            def outer():
                try:
                    recurse()
                except RuntimeError:
                    pass

            w = threading.Thread(target=outer)
            w.start()
            w.join()
            print('end of main thread')
            """
        expected_output = "end of main thread\n"
        p = subprocess.Popen([sys.executable, "-c", script],
                             stdout=subprocess.PIPE)
        stdout, stderr = p.communicate()
        data = stdout.decode().replace('\r', '')
        self.assertEqual(p.returncode, 0, "Unexpected error")
        self.assertEqual(data, expected_output) 

def test_threaded_poll(self):
        r, w = os.pipe()
        self.addCleanup(os.close, r)
        self.addCleanup(os.close, w)
        rfds = []
        for i in range(10):
            fd = os.dup(r)
            self.addCleanup(os.close, fd)
            rfds.append(fd)
        pollster = select.poll()
        for fd in rfds:
            pollster.register(fd, select.POLLIN)

        t = threading.Thread(target=pollster.poll)
        t.start()
        try:
            time.sleep(0.5)
            # trigger ufds array reallocation
            for fd in rfds:
                pollster.unregister(fd)
            pollster.register(w, select.POLLOUT)
            self.assertRaises(RuntimeError, pollster.poll)
        finally:
            # and make the call to poll() from the thread return
            os.write(w, b'spam')
            t.join() 

def setUp(self):
        self._threads = test_support.threading_setup()
        self.evt = threading.Event()
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.settimeout(15)
        self.port = test_support.bind_port(self.sock)
        servargs = (self.evt, "220 Hola mundo\n", self.sock)
        self.thread = threading.Thread(target=server, args=servargs)
        self.thread.start()
        self.evt.wait()
        self.evt.clear() 

def setUp(self):
        self.old_stdout = sys.stdout
        self.output = StringIO.StringIO()
        sys.stdout = self.output

        self._threads = test_support.threading_setup()
        self.evt = threading.Event()
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.settimeout(15)
        self.port = test_support.bind_port(self.sock)
        servargs = (self.evt, "199 no hello for you!\n", self.sock)
        self.thread = threading.Thread(target=server, args=servargs)
        self.thread.start()
        self.evt.wait()
        self.evt.clear() 

def setUp(self):
        self.old_stdout = sys.stdout
        self.output = StringIO.StringIO()
        sys.stdout = self.output

        self.evt = threading.Event()
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.settimeout(15)
        self.port = test_support.bind_port(self.sock)
        servargs = (self.evt, self.respdata, self.sock)
        threading.Thread(target=server, args=servargs).start()
        self.evt.wait()
        self.evt.clear()