UpStare

http://files.mkgnu.net/files/upstare/doc/latest_manual/html-multi/c85.html
UpStare can update applications while they are live and running without stopping the application at all. It achieves this goal by reconstructing the process stack and updating the program state in a single step. This eliminates the possibility of an old version of the code to be executed on a newer version of a datatype representation (a type-safety error). The updates are applied immediately, even in multi-threaded programs. It is not necessary to wait indefinitely for a quiescent program state, such as waiting for a program thread to receive data from a network socket before an update can begin. A running algorithm can be updated midstream its execution and resumed from a different point (not necessarily the beginning) of another algorithm that is behaviorally equivalent: an algorithm that aims to produce the same results while reusing existing progress.

that sounds gay

i've been ``upstaring'' in emacs with SLIME for years

that sounds gay

i've been ``upstaring'' in emacs with Erlang for years

that sounds gay

i've been ``upstaring'' in windows with code execution vulnerabilities for years

>>1
This would be useful for game development.

>>1
Can it also automatically update any program state whose representation has changed between versions? These kinds of systems have limited practical use because you always have to write extra code to update the data stores.