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trap "echo got signal" USR1
for try in 1 2 3 4 5; do
kill -USR1 $$
sleep 0.2
echo "sent $try signal"
done &
# Ensure "wait" has something to wait for
sleep 2 &
# Ensure we do not execute "trap" below before "kill -USR1" above
# (was getting failure on loaded machine without this)
sleep 0.1
sleeping=true
while $sleeping; do
trap
if wait %%; then
echo "sleep completed"
sleeping=false
elif [ $? == 127 ]; then
echo "BUG: no processes to wait for?!"
sleeping=false
else
echo "wait interrupted"
fi
done
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