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VxWorks, made and sold by Wind River Systems of Alameda, California, USA, is a real-time operating system. Similar real-time operating systems are available from other vendors: QNX, LynxOS[?], VRTX[?], pSOS, Windows CE, Nucleus RTX[?], etc..

Major features of VxWorks include a fast, multitasking kernel with pre-emptive scheduling and fast interrupt response, extensive intertask communications and synchronization facilities, efficient UNIX-compatible memory management, multiprocessor facilities, a shell for user interface, symbolic and source level debugging capabilities, performance monitoring and an I/O file system.

Because VxWorks is generally used in embedded systems, it requires a host workstation for program development. Unlike "native" systems such as UNIX and QNX, VxWorks development is done on a "host" machine running UNIX or Windows, cross-compiling target software to run on various "target" CPU architectures.

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