Real-time operating system

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	Real-time operating system - Wikipedia, the free encyclopedia
		An early example of a large-scale real-time operating system was the so-called "control program" developed by American Airlines and IBM for the Sabre Airline Reservations System.
		A real-time operating system (RTOS) is a class of operating system intended for real-time applications.
		Since an interrupt handler blocks the highest priority task from running, and since real time operating systems are designed to keep thread latency to a minimum, interrupt handlers are typically kept as short as possible.
	en.wikipedia.org /wiki/RTOS (1401 words)

	What is operating system? - A Word Definition From the Webopedia Computer Dictionary
		General-purpose operating systems, such as DOS and UNIX, are not real-time.
		Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers.
		The commands are accepted and executed by a part of the operating system called the command processor or command line interpreter.
	www.webopedia.com /TERM/o/operating_system.html (671 words)

	Reference.com/Encyclopedia/Operating system
		An operating system is conceptually broken into three sets of components: a user interface (which may consist of a GUI and/or a command line interpreter or "shell"), low-level system utilities, and a kernel--which is the heart of the operating system.
		The operating system ensures that other applications are able to use memory, input and output devices and have access to the file system.
		In some operating systems the shell and the kernel are completely separate entities, allowing you to run varying combinations of shell and kernel (eg UNIX), in others their separation is only conceptual.
	www.reference.com /browse/wiki/Operating_system (1311 words)

	PDOS - Real Time Operating System
		The PDOS operating system is comprised of the system kernel and three resource modules.
		The PDOS system kernel is the nucleus of PDOS.
		The system kernel provides fundamental system services, while supplemental services are furnished by the Monitor, Debugger, and File Management resource modules.
	www.eyring.com /pdos/architec.html (574 words)

	Introduction to Priority Inversion - real-time operating system, RTOS, preemption, fixed priority scheduling
		This problem was not caused by a mistake in the operating system, such as an incorrectly implemented semaphore, or in the application.
		The real trouble arises at run-time, when a medium-priority task preempts a lower-priority task using a shared resource on which the higher-priority task is pending.
		Any time two tasks share a resource, such as a memory buffer, in a system that employs a priority-based scheduler, one of them will usually have a higher priority.
	www.netrino.com /Publications/Glossary/PriorityInversion.html (1055 words)

	Howstuffworks "How Operating Systems Work"
		The purpose of an operating system is to organize and control hardware and software so that the device it lives in behaves in a flexible but predictable way.
		If you like to tinker with electronic devices, you are probably pleased that operating systems can now be found on many of the devices we use every day, from cell phones to wireless access points.
		This is far from a happy accident; one of the reasons operating systems are made out of portable code rather than permanent physical circuits is so that they can be changed or modified without having to scrap the whole device.
	www.howstuffworks.com /operating-system.htm (448 words)

	The Maruti Project
		A hard real-time system must be capable of switching from one scenario to another, maintaining the system in a safe and stable state at all times, without violating the timing constraints.
		We realized that Unix is not a very hospitable host for real-time applications, as very little control over the use of resources can be exercised in that system without extensive modifications to the kernel.
		The first version of the system was designed as an object-oriented system with suitable extensions for objects to support real-time operation.
	www.cs.umd.edu /projects/maruti (1452 words)

	POSIX in Real-Time
		The timing constraints in a soft real-time system are not as stringent.
		Scalable Real-time Computing in the Solaris Operating Environment.
		To guarantee that the timing requirements of a real-time system are met, the behavior and timing of the underlying computing system must be predictable.
	xtrj.org /collection/posix_rtos.htm (5122 words)

	RTOS Selection Guide - real-time operating system, criteria, latency
		The third real-time characteristic of an operating system is the amount of time required to perform a context switch.
		Each operating system will internally disable interrupts in several places and for different lengths of time, so it is important that you know what your system's requirements are.
		So it's extremely important that the designers of real-time embedded systems know everything they can about the behavior and performance of their hardware and software.
	www.netrino.com /Articles/RTOSes (1185 words)

	real-time operating systems - jasonwaltman.com
		Separately the kernels are designed for use on microcontrollers with restrictive footprint requirements, or in an environment requiring a full-featured real-time operating system.
		Determinism is the ability of the operating system to perform a task in a determined amount of time.
		Finally, fail-soft operation is the ability of the operating system to keep running (with possibly a slight loss of performance) in spite of some internal corruption.
	www.jasonwaltman.com /compsci/rtos.html (1992 words)

	KADAK AMX RTOS real-time operating system
		Real Time Operating System (RTOS), first released in 1980, has been recognized as a superior RTOS which meets the critical needs of the most challenging real time applications.
		TAPS is a fully functional AMX implementation including a real time clock, ensuring that your tested system is ready for the final move to your embedded system.
		And if execution speed, interrupt response and task switching times are of utmost concern to you, take a look at our real timing figures for any of the supported processors.
	www.kadak.com /rtos/rtos.htm (360 words)

	Prex - Embedded Real-Time Operating System
		The Prex project is an open source initiative to provide a portable real-time operating system for embedded systems.
		This design allows the system to perform both of the native real-time task and the generic UNIX process simultaneously without degrading real-time performance.
		The other basic OS functions - process, file system, application loading, and networking, are provided by the user mode servers.
	prex.sourceforge.net (438 words)

	Worst-Case Execution Time Analysis of the RTEMS Real-Time Operating System
		Abstract: An important issue in building operating systems for hard real-time applications is to compute the worst-case execution times (WCET) of the operating system activities.
		Worst-Case Execution Time Analysis of the RTEMS Real-Time Operating System
		In this paper, we explore the alternative approach of using static analysis to predict off-line the WCET of the system calls of a real-time kernel, the RTEMS kernel [11].
	csdl.computer.org /comp/proceedings/ecrts/2001/1221/00/12210191abs.htm (193 words)

	osCAN Real-time Operating System Information - SPACE Tools CD
		Yet, as a modern operating system, it provides efficient system services, which enable the software engineer to structure the design neatly and concentrate on the application functionality.
		Aside the operating system kernel osCAN may be delivered with the Vector CAN-driver and communication modules for various applications.
		Four system objects are given by the standard: tasks, events, resources and alarms.
	www.spacetools.com /tools4/space/464.htm (518 words)

	RTOS - INTEGRITY Features - Real-Time Operating System - Green Hills Software
		Other operating systems might require the four tasks (A, B, B1, B2) to share the CPU equally, in which case Task A would only get 25%, as opposed to the 50% intended by the system designer.
		With over 1,000 functions supported, POSIX System Interfaces can run on any computer with a conformant operating system, regardless of the operating system’s underlying implementation or the computer’s hardware architecture.
		Critical tasks and address spaces will always get the CPU time they need, regardless of what any other tasks or address spaces are doing in the system.
	www.ghs.com /products/rtos/integrity_rtos_features.html (2530 words)

	Comp.RealTime NewsGroup FAQ
		Real-Time Systems: Real-Time Systems is a journal on time-critical computing systems.
		"A real-time system is one in which the correctness of the computations not only depends upon the logical correctness of the computation but also upon the time at which the result is produced.
		Rule: everywhere time is used by the system, there is a potential year 2000 problem.
	www.realtime-info.be /encyc/publications/faq/rtfaq.htm (4976 words)

	TRON (The Real Time Operating System Nucleus)
		TRON (The Real Time Operating System Nucleus) is a complex and
		The Gmicro Microprocessor and the AT&T UNIX Operating System
		distributed numerical computation, and real time distributed computation,
	www.atip.org /public/atip.reports.91/tron.html (3211 words)

	Real-Time Secure Operating System
		The system services shown in Figure 1 in red (the right-most of the three system-services blocks) are a subset allowing them to be evaluated at the highest level.
		In this way, it is possible for the system to support applications of mixed security levels since the security policies are at the highest level in the system and can allow or deny communication between differing levels of security.
		MLS will allow the DoD the ability to have soldiers in the field use systems that are capable of running very sensitive information and ensure that data will not accidentally be shared with personnel who are not cleared to the appropriate level.
	www.lynuxworks.com /products/whitepapers/secure-rtos.php3 (1520 words)

	RTOS - INTEGRITY - embedded os, secure os, embedded real-time operating system - Green Hills Software
		It is first and foremost a true hard real-time operating system.
		Unlike other memory protected operating systems, INTEGRITY does not sacrifice real-time performance for security and protection.
		Complex system calls can be suspended to allow other tasks to execute.
	www.ghs.com /products/rtos/integrity.html (419 words)

	AvSYS - Real-Time Operating System
		Anyone who has ever developed an embedded project with even a single interrupt has spent the time to create their own Real-Time Operating System.
		When it is time to debug your application, the built in system monitor acts as a ready-to-go remote monitor debugger that is fully system aware.
		Sometimes even embedded systems with no interrupts handle more than one task at once and require a lot of thought and design to handle timing and data considerations.
	www.avocetsystems.com /company/techshee/asheets/avsys.html (918 words)

	Linux/RK
		A resource kernel is a real-time kernel (operating system) that provides timely, guaranteed and enforced access to system resources for applications.
		Linux/RK is developed by the Real-time and Multimedia Systems Laboratory led by Dr.
		SYS_CLOCK is the optimal algorithm for systems that have high timing overhead on voltage or frequency scaling such as IPAQ and BitsyX which take about 20 ms to switch the voltage.
	www.cs.cmu.edu /afs/cs/project/art-6/www (255 words)

	The Dresden Real Time Operating System Project (DROPS)
		Conventional operating system personalities (such as the UNIX emulation) will run in best effort mode on top of the real time architecture.
		In practice, a system like QNX (a realtime system build on a small 8k byte sized microkernel) has proved to be commercially successful [5].
		Used in embedded systems an accurate advance planning and scheduling is necessary to provide hard guarantees [6].
	os.inf.tu-dresden.de /project/overview.html (1126 words)

	Real-Time Operating System
		INTEGRITY 2000 real-time operating system is integrated with Green Hills Software’s MULTI software development environment and is optimized for mission-critical embedded applications.
		The system’s EventAnalyzer logs important events like semaphore calls, context switches and interrupts on the target in real time.
		The system features advanced memory protection capabilities, dynamic download, task- and system-level debug, a zoomable real-time EventAnalyzer, POSIX support, and TCP/IP networking.
	www.embeddedtechnology.com /Content/ProductShowcase/product.asp?DocID={9C2D0697-8249-11D3-9A67-00A0C9C83AFB}&VNETCOOKIE=NO (135 words)

	Overview of the Keil RTX51 Real-Time Kernel
		RTX51 is a real-time kernel for the 8051 family of microcontrollers that is designed to solve two problems common to embedded programs.
		Real-time control: operations must execute within a defined period of time.
		While it is possible to implement an embedded program without using a real-time kernel, a well-established, proven kernel, like RTX51, saves time and makes software development easier.
	www.keil.com /rtx51 (82 words)

	OSEK compliant Real Time Operating System (RTOS)
		Metrowerks OSEKturbo is a small, fast, reliable, scalable Real-Time Operating System (RTOS) that provides a valuable set of RTOS services that can be leveraged by your embedded application.
		specifications, the operating system is designed to occupy very little memory, provide fast context switching times and increase reusability of your embedded application.
		Additionally, deterministic scheduling tools that help uncover timing problems early in the development lifecycle are available.
	www.metrowerks.com /MW/Develop/Embedded/OSEK.htm (535 words)

	Proven RTOS, Stacks & Software Tools for ColdFire, PowerPC, ARM & ARC Processors
		The MQX Real-time Operating System provides proven performance, with blazing real-time speed within a tiny footprint.
		During this time, developers have come to rely on the way the MQX RTOS works with their tools to help them keep on schedule.
		The MQX RTOS is designed to be easy to configure to balance code size with performance requirements; alternative settings can be selected, benchmarked and iterated to optimize cost and performance.
	www.mqxembedded.com /products/mqx (1020 words)

	Nucleus Real-Time Operating System
		Our embedded products take you from start to finish with a full suite of Nucleus software including modeling software, prototyping tools, real-time operating system (RTOS), middleware and development tools.
		Nucleus MMU allows for a wide variety of services to be protected, from tasks to system objects to the entire kernel.
		With Nucleus DDL, you have the ability to dynamically load, unload and execute your application on a running target.
	www.mentor.com /products/embedded_software/nucleus_rtos/index.cfm?redironce=1& (351 words)

	PDOS - Real Time Operating System
		Native PDOS is a complete operating system that is bootable from the target system.
		The PDOS Operating System is implemented in two ways:
		VMEPROM and VMEPROM/BSDnet furnish you with a simple method for porting your application to the target system, with PDOS and the target hardware fully compatible with your application.
	www.eyring.com /pdos (269 words)

	The Open Group Real-time & Embedded Systems Forum
		The Real-time and Embedded Systems Forum defines, coordinates, integrates and prioritizes real-time and embedded systems standards utilizing various existing architectural approaches.
		Examining the intersection of security requirements with real-time and embedded systems to develop reference protection profiles.
		for real-time and embedded systems and applications, including POSIX® Profiles, Linux® for Embedded Systems, and Safety and Mission-Critical real-time Java®.
	www.opengroup.org /rtforum (322 words)

	Amazon.com: The QNX 4 Real-time Operating System: Books: Frank Kolnick
		Frank Kolnick is the president of Basis Computer Systems Inc., a consulting company with decades of experience in operating systems, real-time applications and technical documentation.
		Do embedded systems development, some with LINUX: A guide by josie_roberts, Done some work with slave-boards and co-processor...
		This paradigm applies to all levels of programming, from device drivers to file systems to the LAN.
	www.amazon.com /exec/obidos/tg/detail/-/0921960018?v=glance (973 words)

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