MiThOS-a real-time micro-kernel threads operating system

F. Mueller, V. Rustagi, T. Baker
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引用次数: 6

Abstract

MiThOS (Micro-kernel Threads Operating System) is an experimental operating system for embedded systems. The system kernel is a first implementation of the POSIX Minimal Real-Time System Profile. It is based on prior work of a library implementation of Pthreads (POSIX threads). The system is fully preemptive. It supports multi-threading within a single process environment with shared kernel and user space, i.e. real-time tasks are mapped onto POSIX threads. It exhibits remarkable timing predictability intended for hard real-time requirements. This is achieved by a careful design of only few device drivers. The system has been implemented and tested on the SPARC VME architecture. The system includes a fast context switching algorithm for the SPARC which outperforms the context switch under SunOS and matches the performance under Solaris. It supports selective enabling and disabling of hardware components (MMU, caches, etc.) since its sources are available. Furthermore, an implementation-defined extension of POSIX threads for deadline scheduling is presented. Overall, the system exhibits slightly faster performance than SunOS 4.x and is considerably more predictable in its timing behavior. Applications of the kernel range from evaluating the overhead of new language features in Ada 95 and its runtime system, verifying static timing predictions on a bare machine, to providing the operating system for small embedded system that require a high timing predictability.
一个实时的微内核线程操作系统
MiThOS(微内核线程操作系统)是一个用于嵌入式系统的实验性操作系统。系统内核是POSIX最小实时系统配置文件的第一个实现。它基于Pthreads (POSIX线程)的库实现的先前工作。系统是完全抢占的。它支持在共享内核和用户空间的单一进程环境中的多线程,即实时任务被映射到POSIX线程上。它展示了用于硬实时需求的非凡的时间可预测性。这是通过精心设计几个设备驱动程序来实现的。该系统已在SPARC VME架构上进行了实现和测试。该系统包括一个用于SPARC的快速上下文切换算法,该算法优于SunOS下的上下文切换算法,并与Solaris下的性能相匹配。它支持选择性地启用和禁用硬件组件(MMU、缓存等),因为它的源代码是可用的。此外,还提出了POSIX线程的实现定义扩展,用于最后期限调度。总体而言,该系统表现出比SunOS 4稍快的性能。X,并且其计时行为更可预测。内核的应用范围从评估Ada 95及其运行时系统中新语言特性的开销,验证裸机上的静态时间预测,到为需要高时间可预测性的小型嵌入式系统提供操作系统。
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