I have combined Kon Lovett's mailbox egg with the chicken scheme srfi-18 implementation to provide the thread-send and thread-receive primitives that are available in other scheme implementations like gambit-c. The results of this can be installed using the egg repository with
chicken-install mailbox-threads
This is one of the required eggs for my ongoing porting efforts of the erlang style message passing framework termite. The intermediate code can be obtained from my termite.git repository.
Currently all the primitives like !, ?> and recv are working.
Documentation is under way. Stay tuned for further updates.