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Is a priority based, preemptive multitasking, real time operating system designed and optimized for high performance DSP and media centric microprocessors. It is one of the world smallest, most highly optimized rtos. It speed up the product development with these innovative features:
Includes queues, mailboxes, events, memory pools, pocket handlers, semaphores……
Priority inversion protection
Source code provided to simplify development
is an operating system that is geared to the processing of data on a continuous basic in real-time as it flows to and from external devices.
It is a real time preemptive, multitasking priority based operating system.
It is also royalty free operating system, that purchased as a library or source code.
WIND RIVER SYSTEM
It was formed by a partnership of Jerry Fiddler and Dave Wilner.
It is a company providing embedded systems development tools for embedded systems, middleware's, and other types of software.
Started as an improvement on a primitive ROM chip with a 4K kernel sold by a ready systems, now a mentor graphics product.
It is designed for use in embedded systems. Unlike self-hosting system such as Unix, Vxworks development is done on a host machining running Linux, Unix or Windows cross compiling target software to run on various, CPU architecture.
PILOT -was a single user, multitasking os designed by Xerox parc in early 1977. It is written in Mesa programming languages, totaling about 24,000 lines of codes.
It designed as a single user system in a highly networked environment of other pilot systems, with interfaces designed for inter-process, communication (IPC) across the network via the pilot stream interface.
It combined virtual memory and file storage into one subsystem and used the manager/ Kernel architecture for managing the system s and its architecture for managing the system and its resources.
It designer considered a non preemptive multitasking model, but later chose a preemptive system based on monitors.
It is used as the os for the Xerox star work station. .
Also referred to as the river PERQ or ICL PERQ, was a pioneering workstation computer workstation computer produced in the early 1980’s.
It was written in PERQ Pascal.
Designed was influenced by the original workstation computer, the Xerox alto -it was the first commercially produced personal workstation.
The origin of the name perq is from the perquisite.
LISP-BASED OPERATING SYSTEM LISP MACHINE OS -were general purpose computer designed( usually use hardware) to efficiently run.
Lisp is the main software languages.
They were the first commercial single core workstation.
It commercially pioneered many now common place technologies, including effective garbage collection, laser printing, windowing system, computer mice, high resolution bit mapped graphics rendering and networking innovation.
The operating system were written in lisp machine lip, inter lisp (Xerox) and later partly in common lisp.