On 2016-01-02 15:40:03 +0100, Andres Freund wrote:
> If FD_CLOSE is indeed edge and not level triggered - which imo would be
> supremely insane - we'd be in trouble. It'd explain why some failures
> are noticed and others not.

I wonder if the FD_CLOSE and FD_WRITE being edge-triggered is the actual
root cause for:
         * Just a workaround of unknown locking problem with writing in UDP 
         * under high load: Client's pgsql backend sleeps infinitely in
         * WaitForMultipleObjectsEx, pgstat process sleeps in pgwin32_select().
         * So, we will wait with small timeout(0.1 sec) and if socket is still
         * blocked, try WSASend (see comments in pgwin32_select) and wait again.
        if ((what & FD_WRITE) && isUDP)
in pgwin32_waitforsinglesocket().


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