vxworks why in aerospace

1.VxWorks is a real-time operating system introduced by WindRiverSystem (hereinafter referred to as Wind River, that is, WRS).Tornado is a real-time operating system development environment introduced by WRS, similar to MicrosoftVisualC, but provides a richer debugging, simulation environment and tools. Embedded Vxworks system's main application areas are the following: 1. data networks: such as: Ethernet switches, routers, remote access servers, etc. 2. remote communications: such as: telecommunications with the private packet switch and automatic call distributor, cellular telephone systems, etc. 3. medical equipment: such as: radiotherapy equipment 4. consumer electronics: such as: personal digital assistants, etc. 5. transportation: e.g., navigation systems, high-speed train control systems, etc.6. Industry: e.g., robotics.7. Aerospace: e.g., satellite tracking systems.8. Multimedia: e.g., videoconferencing equipment.9. Computer peripherals: e.g., X terminals, I/O systems, etc.9. To summarize, the system architecture of VxWorks is a hierarchy of fairly small microkernels. The kernel provides only the multitasking environment, inter-process communication and synchronization functions. These functional modules are sufficient to support the rich performance requirements that VxWorks offers at higher levels. 2. Linux is a collective term for a class of Unix computer operating systems. The Linux operating system is also the most famous example of free software and open source development. Strictly speaking, the term Linux itself refers only to the Linux kernel, but in practice it has become customary to use the term Linux to describe an entire operating system based on the Linux kernel and using GNU-engineered tools and databases.Linux was named after computer hobbyist Linus Torvalds. In the past, Linux was primarily used as an operating system for servers because of its cheapness, flexibility, and Unix background. Traditionally, the Linux-based "LAMP (Linux, Apache, MySQL, Perl/PHP/Python)" technology has become popular among the developer community, and is now the most common platform used by web service providers. Due to its low cost and high configurability, Linux is often used in embedded systems such as set-top boxes, cell phones and mobile devices. In cell phones, Linux has become a major competitor to SymbianOS, while in mobile devices, it has become an alternative to WindowsCE and PalmOS. The popular TiVo digital camera uses a customized version of Linux, and there are a number of hardware network firewalls and routers, such as some of the LinkSys products, which are Linux-driven and use the firewall and routing features provided by the operating system. The number of supercomputers using Linux is also increasing. According to the Top 500 Supercomputers list in November 2008, the world's fastest supercomputers are now using Linux as their operating system. Of the 500 systems listed, 439 (87.8%) use Linux as their operating system, and the Sony PlayStation 3, which has been on sale since 2006, also uses Linux as its operating system, with YellowDogLinux, a desktop system. Previously, Sony released a DIY kit called PS2Linux for the PlayStation 2. Ubuntu has resumed PPC support (including for the PlayStation 3) since version 9.04. With the introduction of low-cost computers such as OLPC's XO-1 and ASUS's EeePC, many people are optimistic that linux's market share in the low-end PC market is growing rapidly. However, after Windows entered this market, the market share of Linux declined rapidly. Now Windows has an absolute advantage in all PC markets.