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摘要： Some electronic devices cannot embed any battery because of space- or cost-related concerns. Notably, small devices harvest energy from their environment to gap the absence of battery. Medical sensors and crop probes are examples of such devices. These devices are likely to consume energy faster than they can harvest, when considering non-solar energy or small harvesters for instance. They are thus exposed to frequent power outages and must cope with an intermittent supply and are referred to as transiently-powered systems. Instead of restarting the application from the very beginning on every boot, it is possible to resume the application where it stopped. Non-volatile memories keep their data across power outages and their usage enable persistent data storage. Non-volatile RAM (NVRAM) and traditional volatile RAM have similar access latencies, which makes NVRAM technologies good candidates for persistent storage of energy-constrained devices. This work highlights the benefits of using NVRAM for the purpose of enabling the execution of long-running application despite power outages. This study proposes to solve issues related to intermittent supply at operating system level, which role is to manage application progress persistence and maintain consistency between memories and peripherals. This work also proposes a model for transiently-powered systems to lay the ground for energy consumption estimation of code involving peripherals. A new checkpointing mechanism, based on a hardware MPU, is proposed as a checkpointing optimization. Finally, this work proposes an introduction to proof of correctness at operating system level for transiently-powered systems.

关键词： 混合式线上教学   金课   操作系统   启发式   研究型  

摘要： 针对目前新冠肺炎疫情形势下我国高校本科教育的教学现状,以金课建设为抓手,以操作系统课程为例,提出混合式线上教学模式的设计方案,即采用多样化和创新性的线上教学形式,将案例驱动的启发式教学模式和研究型教学模式应用在该课程的教学中,以此调动学生的学习积极性和培养学生的综合能力,最后说明线上教学效果。

关键词： 计算机硬件   操作系统   计算机系统   最底层   核心地位  

摘要： 梁森山:长期以来,在高科技领域,我国一直存在一个绕不开的痛点——最底层的基础技术领域“缺芯少魂”。“芯”指芯片,“魂”指的就是操作系统。操作系统是配置在计算机硬件上的第一层软件,占据整个计算机系统核心地位。当前主流的操作系统有哪些?分别应用于什么领域呢?

关键词： 微内核   RT-Thread   RT-Thread Smart   MMU   进程管理   共享页面  

摘要： RT-Thread Smart采用微内核的设计思想,将操作系统自身的服务组件从内核中剥离出来,在用户态以进程的形式运行,避免服务组件的错误造成内核崩溃,提高系统整体的稳定性和可靠性。另一方面,依据用户配置选项,RT-Thread Smart继续支持将组件编译进内核中,以获得更佳的性能和向下兼容性。为了支持这些特性,RT-Thread Smart实现了对MMU和进程管理的支持,并通过通道机制来完成内核和用户态进程间的数据交换。

关键词： 实验学校   自主创造   成都双流   实践家   操作系统   课程体系   最好的自己   校长  

摘要： 在教育这片苍茫的大海上,成都双流中学实验学校这艘航船已经航行了十七个年头,掌舵这艘航船的就是校长高志文先生。对于教育,高校长有自己独有的情怀和理解。对于双中实验学校这艘航船,他认为:"让学生成长为最好的自己"是不变的航标;"人本、规范、创新、现代"的理念,是坚固的船体;"校本构建的课程体系"是有效的操作系统;全体师生的自主创造和努力,是不竭的动力。"

关键词： 开源软件   人工智能   应用软件   大数据   云计算   操作系统   数据库   开源代码  

摘要： 当前,开源软件在软件供应链体系渗透率不断提高,已经成为软件生态中必不可少的要素。在云计算、大数据、人工智能、工业互联网等新兴领域,开源已成为主要开发模式。操作系统、数据库、中间件软件、应用软件、设备固件等的开发、编译、测试都越来越多的采用开源代码,软件供应链的开源化趋势越来越明显。