[Twisted-Python] _Win32Waker

[Aron Bierbaum]

I have been unable to reproduce this problem on multiple machines that
I have tested on. Also I have tried changing various network settings
on my machine without any change. Do you have any ideas what I should
be looking for?

Thanks,
Aron

On Fri, Mar 6, 2009 at 7:51 AM, Jean-Paul Calderone <exarkun at divmod.com> wrote:
> On Thu, 5 Mar 2009 16:49:15 -0600, Aron Bierbaum <aronbierbaum at gmail.com>
> wrote:
>>
>> I have been using a custom Qt4 reactor that derives from
>> PosixReactorBase. As a result it creates a _Win32Waker to allow
>> threads and signals to wake up the IO thread. It seems though that the
>> current implementation only works about half of the time. The other
>> half it exists with :
>>
>>  File "...\Lib\python2.6\site-packages\twisted\internet\posixbase.py",
>> line 170, in __init__
>>   ReactorBase.__init__(self)
>>  File "...\Lib\python2.6\site-packages\twisted\internet\base.py",
>> line 424, in __init__
>>   self._initThreads()
>>  File "...\Lib\python2.6\site-packages\twisted\internet\base.py",
>> line 813, in _initThreads
>>   self.installWaker()
>>  File "...\Lib\python2.6\site-packages\twisted\internet\posixbase.py",
>> line 206, in installWaker
>>   self.waker = _Waker(self)
>>  File "...\Lib\python2.6\site-packages\twisted\internet\posixbase.py",
>> line 77, in __init__
>>   client.connect(server.getsockname())
>>  File "<string>", line 1, in connect
>> socket.error: [Errno 10049] The requested address is not valid in its
>> context
>>
>> I have attached a simple test that shows that the following code does
>> not always return "127.0.0.1", but sometimes returns "0.0.0.0" as the
>> IP address.
>>
>>       # Following select_trigger (from asyncore)'s example;
>>       server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
>>       client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
>>       client.setsockopt(socket.IPPROTO_TCP, 1, 1)
>>       server.bind(('127.0.0.1', 0))
>>       server.listen(1)
>>       client.connect(server.getsockname())
>>
>> My current workaround just calls the following instead:
>>
>>       client.connect(('127.0.0.1', server.getsockname()[1]))
>>
>> Any ideas on what is really causing the error? If there is not a
>> better solution can this be added to trunk for future releases?
>
> It's definitely true that you can't connect to "0.0.0.0" on Windows, and
> various parts of Twisted try to deal with this in some way already.  It
> isn't clear to me why that getsockname() isn't returning "127.0.0.1" though.
> I expect it's due to some configuration change or third-party networking
> software on the Windows machine.  Do you think you can track that down?
> That will make it much easier to think about the problem and the solution.
>
> Jean-Paul
>
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