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Semaphores revisited with MMS

机译:使用MMS重新访问信号灯

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The objective of this article is to realize an in-depth study of MMS semaphores. This article is not a tutorial on MMS semaphores although it does explain to some extent how MMS semaphores behave and can be utilized. What we are trying to achieve is a definitive clarification of the MMS semaphore concept in order to make its use easier to MMS programmers and to encourage its adoption in the industrial applications and products. We compare MMS semaphores to Dijkstra's classical semaphores and show that real differences exist. Other mechanisms are also discussed (monitors, CSP). Examples are provided to illustrate our analysis and references to the semaphore mechanism of some operating systems are given to ease the comparison. We come to the conclusion that MMS semaphores are flexible but cannot be utilized to solve all kinds of problems classical semaphores usually cope with. We also explain why the two kinds of semaphores provided by MMS are redundant.
机译:本文的目的是实现对MMS信号灯的深入研究。虽然本文在一定程度上解释了MMS信号的行为和使用方式,但它不是MMS信号的教程。我们试图实现的是对MMS信号量概念进行明确的说明,以使MMS程序员更容易使用它,并鼓励其在工业应用程序和产品中采用。我们将MMS信号量与Dijkstra的经典信号量进行比较,并表明存在真正的差异。还讨论了其他机制(监视程序,CSP)。提供示例来说明我们的分析,并提供了一些操作系统的信号量机制参考,以简化比较。我们得出的结论是,MMS信号量是灵活的,但不能用来解决传统信号量通常要解决的各种问题。我们还将解释为什么MMS提供的两种信号量是多余的。

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