in reply to Re^2: fixed set of forked processes
in thread fixed set of forked processes
Your parent process will know the PID of each child process, so you can kill 0, $pid to see if it's running. Not sure what the performance implications are.
Since you were mentioning ps & grep, I thought I'd mention this simple alternative.
If all you want is to know if children are alive or dead, you might want to look into $SIG{CHLD} which tells you when kids die. That's in perlipc too.
--Pileofrogs
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