When a thread tries to enter the lock body, the Exchange gives it access to the previous thread s New variable. The previous thread s site is New s owner. When the previous thread binds New, the owner sends the binding to the next thread s site. Chow, R. and Johnson, T. 1997. Distributed Operating Systems and Algorithms .
Electronic commerce is possible through secure protocols.
Yet , despite this explosive development, distributed computing itself remains a major challenge. To emphasize that these processes are not necessarily on the same machine, we call them sites. Such a system is fundamentally different from a single process. The system is inherently concurrent and nondeterministic. There is no global information nor global time.