Thomas Munro f98b8476cd Use signals for postmaster death on FreeBSD. ...

Use FreeBSD 11.2's new support for detecting parent process death to
make PostmasterIsAlive() very cheap, as was done for Linux in an
earlier commit.

Author: Thomas Munro
Discussion: https://postgr.es/m/7261eb39-0369-f2f4-1bb5-62f3b6083b5e@iki.fi

2018-07-11 13:14:07 +12:00

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