You could use a non-blocking waitpid and simply time all the children, then signal/kill them if they go over whatever limits you set.
(from perldoc -f waitpid)
use POSIX ":sys_wait_h";
...
do {
$kid = waitpid(-1, WNOHANG);
} until $kid > 0;
status of the child is in $?
HTH!
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