According to 
https://msdn.microsoft.com/en-us/library/windows/desktop/ms739177(v=vs.85).aspx 
<https://msdn.microsoft.com/en-us/library/windows/desktop/ms739177(v=vs.85).aspx>,
implementation of POSIX's select on Windows restricts fd_set to contain 
descriptors from only one provider.
This recently became a problem with my VMCI implementation, because VMCI 
sockets are of a different family
(I assume provider = family in Window's terminology).

While I'm working on a fix, I'm wondering why it wasn't a problem before, given 
that signaler uses the loopback interface on Windows.
Can anyone think of a problem that can be related to this restriction?


Best Regards,
Ilya Kulakov

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