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Real-Time Executive for Multiprocessing Systems

RTEMS is a real-time executive (kernel) which provides a high performance environment for embedded applications with the following features:

  • Standards based user interfaces.
  • Multitasking capabilities.
  • Homogeneous and heterogeneous multiprocessor systems.
  • Event-driven, priority-based, preemptive scheduling.
  • Optional rate monotonic scheduling.
  • Intertask communication and synchronisation.
  • Priority inheritance.
  • Responsive interrupt management.
  • Dynamic memory allocation.
  • High level of user configurability.
  • Open source with a friendly user license.

Project git repositories are located at:

Online documentation is available at:

RTEMS Doxygen for CPUKit:

RTEMS POSIX 1003.1 Compliance Guide:

RTEMS Mailing Lists for general purpose use the users list and for developers use the devel list.

The version number for this software is indicated in the VERSION file.