Abstract
A theory of asynchronous binary sessions is generalized by asynchronous communication subtyping, which actually permutates and optimizes the actions on each participant. With the types of messages distinguished between dependent and independent types, a series of action asynchronous subtyping rules for the two kinds of message types are proposed, respectively. To make such action permutations automatic, an algorithmic asynchronous subtyping is presented, associating the subtyping for session types with asynchronous communication subtyping. In addition, action permutation and optimization will change the sequence and structure of messages sent and received. To ensure runtime safety, the cases of communication errors that may occur in asynchronous sessions are revealed by examples. What’s more, the type compliance we defined assures the progress property, i.e., once a communication has been established, well-formed programs will never starve at communication points. Finally, we conclude and discuss some possible future work in this area.
This work has been supported by the Natural Science Foundation of China under grant 60873234 and Top Key Discipline of Computer Software and Theory in Zhejiang Provincial Colleges at Zhejiang Normal University.
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Yang, Z., Zhong, F., Zhang, J., Song, T. (2012). On Action Permutation and Progress for Partially Commutative Asynchronous Binary Sessions. In: Xiang, Y., Pathan, M., Tao, X., Wang, H. (eds) Internet and Distributed Computing Systems. IDCS 2012. Lecture Notes in Computer Science, vol 7646. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-34883-9_10
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