This paper introduces a mechanism for asserting invariants that are maintained by a program that uses atomic memory transactions. The idea is simple: a programmer writes check E<\/tt> where E<\/tt> is an expression that should be preserved by every atomic update for the remainder of the program’s execution. We have extended STM Haskell to dynamically evaluate check<\/tt> statements atomically with the user’s updates: the result is that we can identify precisely which update is the first one to break an invariant.<\/p>\n","protected":false},"excerpt":{"rendered":"
This paper introduces a mechanism for asserting invariants that are maintained by a program that uses atomic memory transactions. The idea is simple: a programmer writes check E where E is an expression that should be preserved by every atomic update for the remainder of the program’s execution. 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