[GENERAL] How to tell when postmaster is ready

[Thomas Hallgren]

I'm writing a small test harness. I have two threads. One that starts 
the postmaster and another that does all the testing and finally stops 
the postmaster with a pg_ctl stop. At present, the second thread starts 
with a sleep sufficient to ensure that the postmaster is running. Is 
there a proper way to test when the postmaster is ready to receive commands?

Kind regards,
Thomas Hallgren
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