Contemporary live debuggers do not display the complete call stack history for concurrent threads. Hence, developers have less information at their disposal when debugging concurrent threads than when debugging a single threaded, sequential program. We solve the problem of incomplete thread history by creating a debugger that operates on a virtual call stack comprised of multiple threads. With live debuggers displaying at least the equivalent information for both single threaded, sequential

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... rams and concurrent threads, developers can focus on the hard parts of concurrency issues.