Don't have a chance to look at your source at this second, but depending on what your trying to use IPC for, these may be useful:

1. take a look at zentara's excellent thread primer -- he uses shared items to communicate items within threads. http://perlmonks.org/?node_id=691785

2. take a look at the source in http://perlmonks.org/?node_id=704138 where i use the Threads::Queue to do IPC.