I'm sure some people do it with success. Without knowing what kind of set up you have, it's hard to say. I'd be afraid the pigs would try to eat the chickens if they don't roost. Some of mine sleep on the floor. Just food for thought.
Hogs can actually be quite viscous creatures. I heard of someone on BYC who - per suggestion of her neighbor - tried throwing a huge copperhead snake in the hog pen. And they killed and ate it! Two winters ago (before we got chickens), my brothers were shooting some little tweety-birds, wanting to feed them to our pet barn cats since it was winter and the hunting wasn't great. If my brothers shot a bird and it landed in the large hog pen, the hogs would race toward it and eat it before my brothers could get it for our cats. I have also heard of hogs killing and eating chickens. And I do know that the feral hogs around here are known to often kill and eat small fawns. I've never had chickens and hogs at the same time (just so happened that my Dad drove the hogs to the butcher shop a couple hours before the post office called with our very first box of chicks from McMurray, LOL). You can risk it if you want to, but I definitely wouldn't do it if the chickens are valuable or are pets. Could you maybe chicken-proof the hog pen?
