SIGTERM does not stop backend postgres processes immediately

[Parker, Ron]

> Unfortunately, blocking recv() calls are not interruptible on Windows.
> I'm not aware of any mechanism for allowing this.

Under windows two things will interrupt a blocking recv() call.  The first
is to call closesocket() from another thread.  The second is
WSACancelBlockingCall() which no longer exists in Winsock 2, but that is not
a huge problem because cygwin is using Winsock 1.x.

One note, WSACancelBlockingCall() was just a way of getting around the
Winsock 1.1 rule that you couldn't call closesocket() when a blocking call
was pending.  So, closesocket() may have the same effect.

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