The research on Temporal Databases (TDB) has been a hot topic for quite along time, but few implementations have been reported. The authors have developeda prototroe of temporal DBMS in DOS/Windows envirorunent, calle...The research on Temporal Databases (TDB) has been a hot topic for quite along time, but few implementations have been reported. The authors have developeda prototroe of temporal DBMS in DOS/Windows envirorunent, calledHBase. This paper discusses its temporal structure, temporal syntax and semanics,as well as the special techniques used in the Anplementation of HBase.展开更多
Atomic blocks, a high-level language construct that allows programmers to explicitly specify the atomicity of operations without worrying about the implementations, are a promising approach that simplifies concurrent ...Atomic blocks, a high-level language construct that allows programmers to explicitly specify the atomicity of operations without worrying about the implementations, are a promising approach that simplifies concurrent programming. On the other hand, temporal logic is a successful model in logic programming and concurrency verification, but none of existing temporal programming models supports concurrent programming with atomic blocks yet. In this paper, we propose a temporal programming model （αPTL） which extends the projection temporal logic （PTL） to support concurrent programming with atomic blocks. The novel construct that formulates atomic execution of code blocks, which we call atomic interval formulas, is always interpreted over two consecutive states, with the internal states of the block being abstracted away. We show that the framing mechanism in projection temporal logic also works in the new model, which consequently supports our development of an executive language. The language supports concurrency by introducing a loose interleaving semantics which tracks only the mutual exclusion between atomic blocks. We demonstrate the usage of αPTL by modeling and verifying both the fine-grained and coarse-grained concurrency.展开更多
文摘The research on Temporal Databases (TDB) has been a hot topic for quite along time, but few implementations have been reported. The authors have developeda prototroe of temporal DBMS in DOS/Windows envirorunent, calledHBase. This paper discusses its temporal structure, temporal syntax and semanics,as well as the special techniques used in the Anplementation of HBase.
基金Acknowledgements We thank for anonymous referees for their suggestions and comments. This research was based on work supported by grants from Science Foundation of China Project （60833001, 61100063, 61073040 and 61103023）, and by a Humboldt Fellowship （X.Y.） from Alexander von Humboldt Foundation.
文摘Atomic blocks, a high-level language construct that allows programmers to explicitly specify the atomicity of operations without worrying about the implementations, are a promising approach that simplifies concurrent programming. On the other hand, temporal logic is a successful model in logic programming and concurrency verification, but none of existing temporal programming models supports concurrent programming with atomic blocks yet. In this paper, we propose a temporal programming model （αPTL） which extends the projection temporal logic （PTL） to support concurrent programming with atomic blocks. The novel construct that formulates atomic execution of code blocks, which we call atomic interval formulas, is always interpreted over two consecutive states, with the internal states of the block being abstracted away. We show that the framing mechanism in projection temporal logic also works in the new model, which consequently supports our development of an executive language. The language supports concurrency by introducing a loose interleaving semantics which tracks only the mutual exclusion between atomic blocks. We demonstrate the usage of αPTL by modeling and verifying both the fine-grained and coarse-grained concurrency.
