#!/bin/bash

REGRESSION_DURATION=	# average duration of regression test, in seconds
OUTFILE=

[ "$REGRESSION_DURATION" -o ! "$OUTFILE" ] &&
	echo "Must set REGRESSION_DURATION and OUTFILE in the script" 1>&2 &&
	exit 1

[ ! -f parallel_schedule ] &&
	echo "This must be from the Postgres src/test/regress directory" 1>&2 &&
	exit 1

if gmake -h > /dev/null 2>&1
then	MAKE=gmake
else	MAKE=make
fi

# To analyze output, use:
echo "Running ..."
echo "To analyze the output log file, use:"
echo "grep '^\+ *[A-Z][A-Z]*:' /rtmp/regression.sigterm | sort | uniq | less"


while :
do
	(
		SLEEP=`expr $RANDOM \* $REGRESSION_DURATION / 32767`
		echo "Sleeping $SLEEP seconds"
		sleep "$SLEEP"
		echo "Trying kill"
		# send up to 7 kill signals
		for X in 1 2 3 4 5 6 7
		do
			psql -p 55432 -qt -c "
				SELECT pg_terminate_backend(stat.procpid)
				FROM (SELECT procpid FROM pg_stat_activity
				ORDER BY random() LIMIT 1) AS stat
				" template1 2> /dev/null
			if [ "$?" -eq 0 ]
			then	echo "Kill sent"
			fi
			sleep 5
		done
	) &
	$MAKE check
	wait
	[ -s regression.diffs ] && cat regression.diffs >> "$OUTFILE"
done