When I run your code example, "main:Awooga!" is printed. When I comment out the top $SIG{ALRM} assignment, "Alarm clock" is printed. Here is the perl version for my linode: 
[juster@artemis ~]$ perl -v

This is perl 5, version 12, subversion 1 (v5.12.1) built for i686-linu
+x-thread-multi

Copyright 1987-2010, Larry Wall
...

[download]
Here is the version for my macbook. This perl behaves identically to the above perl in the way I mentioned at the top of this note. 
bash-3.2$ perl -v

This is perl, v5.10.0 built for darwin-thread-multi-2level
(with 2 registered patches, see perl -V for more detail)

Copyright 1987-2007, Larry Wall
...

[download]

In reply to Re^5: Threads, bash, and networking by juster
in thread Threads, bash, and networking by morganda

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