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The authors propose an abstraction to alleviate the difficulty of programming with threads. This abstraction is not directly usable by application programmers. Instead, application-visible behavior is defined through a semantical plugin, and invoked via a language or library that uses the plugin. The main benefit is that parallel language run-times become simpler to implement, because they use sequential algorithms for the parallel semantics. This is possible because the abstraction makes available a virtual time in which events in different program time-lines are sequentialized.
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