Sometimes the output to the stdout in Windows disappears

Hi!

Sometimes the output to stdout on Windows on multicore machines does not 
go through after connecting and disconnecting to the server using the 
PQconnectdbParams and PQfinish functions. I tested on 6 cores.

First we appeared this in some pgbench tests.  Then we found that this 
happens on any console program using PQconnectdbParams and PQfinish.

I am attaching a patch and a script for testing.

-- 
Victor Spirin
Postgres Professional:http://www.postgrespro.com
The Russian Postgres Company