What I learned at Uni today

Hackers
Access computer system or network without authorization
Breaks the law; can go to prison
Crackers
Break into systems to steal or destroy data
U.S. Department of Justice calls both hackers
Ethical hacker
Performs most of the same activities but with owner’s permission

>>24
My point being that if you naively lock things to overcome race conditions you can (and usually will) get deadlock in the non-simple case. Simply synchronizing on resources doesn't solve all race conditions. QE-Friggin'-Deadlock.