Signals
I found out why alarm/SIGALRM wasn't working. Safe signals! I needed to add a signal check to MacPerl's PERL_ASYNC_CHECK ... essentially just a if (PL_sig_pending) { despatch_signals() }. The signals were never being raised. I was about to define PERL_OLD_SIGNALS when I looked around and saw its mention in mg.c:Perl_csighandler, and followed the trail to Perl_raise_signal and beyond. 
"It is the common fate of the indolent to see their rights become a prey to the active. The condition upon which God hath given liberty to man is eternal vigilance; which condition if he break, servitude is at once the consequence of his crime and the punishment of his guilt."
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