#!/bin/sh

trap ' exit ' 1 2 3 15
trap ' fuser -k $lck ; rm -f $lck ' 0

lck=`mktemp -t lckXXXXXX`
cp lck $lck
chmod +x $lck

rm -f lck-filename

function f1()
{
	while :
	do
		$lck lck-filename 1
		sleep 1
	done
}

function f2()
{
	while :
	do
		$lck lck-filename 0
	done
}

function f3()
{
	while :
	do
		$lck -r lck-filename 0
	done
}

function f4()
{
	while :
	do
		$lck -r -t lck-filename 0
	done
}

while :
do
	( f1 & f2 & f3 & f4 ) 9<$lck  &
	sleep 5
	fuser -k $lck
	sleep 2
	echo -n write lock test:
	lck -t lck-filename 0 || exit
done