Added comments describing threading

Joel Grunbaum

2020-09-21 e72b38a05a3fd96ab7b057ebb6b3619867be1496

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REPODIR=/repo/x86_64
BUILDDIR=/repo/build
REPONAME=
UPDATE=N
CLEAN=N
SIGN=N
KEY=""
NUM_OLD=5
export PACKAGER="John Doe <jd@change.me>"
EMAIL=""