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arXiv 1301.6572cs.LO
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ω-Petri网

ω-Petri nets

Gilles Geeraerts, Alexander Heußner, M. Praveen, Jean-François Raskin

摘要:

我们介绍了ω-Petri网(ωPN),一个扩展的普通Petri网与ω-标记的输入和输出弧,这是非常适合于分析参数并发系统与动态线程创建。在普通Petri网环境中提出的大多数技术(例如Karp和Miller树或Rackoff技术)并不直接适用于ωPN,因为ωPN定义了具有无限分支的转移系统。这激发了对ωPN的计算方面的彻底分析。我们表明,ωPN可以变成一个普通的Petri网,允许恢复的可达集的ωPN,但不保持终止。这就产生了ωPN上的可达性、(位置)有界性和可覆盖性问题的复杂性界。我们提供了一个实用的算法来计算一个覆盖集的ωPN和决定终止适应经典的Karp和Miller树的结构。我们还将Rackoff技术应用于ωPN,以获得终止问题的精确复杂度。最后,我们考虑了具有重置弧和转移弧的ωPN的扩展,并展示了这种扩展如何影响上述问题的可判定性和复杂性。

英文摘要:

We introduce ω-Petri nets (ωPN), an extension of plain Petri nets with ω-labeled input and output arcs, that is well-suited to analyse parametric concurrent systems with dynamic thread creation. Most techniques (such as the Karp and Miller tree or the Rackoff technique) that have been proposed in the setting of plain Petri nets do not apply directly to ωPN because ωPN define transition systems that have infinite branching. This motivates a thorough analysis of the computational aspects of ωPN. We show that an ωPN can be turned into an plain Petri net that allows to recover the reachability set of the ωPN, but that does not preserve termination. This yields complexity bounds for the reachability, (place) boundedness and coverability problems on ωPN. We provide a practical algorithm to compute a coverability set of the ωPN and to decide termination by adapting the classical Karp and Miller tree construction. We also adapt the Rackoff technique to ωPN, to obtain the exact complexity of the termination problem. Finally, we consider the extension of ωPN with reset and transfer arcs, and show how this extension impacts the decidability and complexity of the aforementioned problems.

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