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.
• Symmetric Multiprocessing (SMP):
  • Cluster scheduling: Job-level fixed prority scheduler (EDF) with support for one-to-one and one-to-all thread to processor affinities.
  • Locking protocols with transitive priority inheritance, priority ceiling, MRsP and OMIP.
• Event-driven, priority-based, preemptive scheduling.
• Scalable timer and timeout support.
• Optional rate monotonic scheduling.
• Intertask communication and synchronisation.
• Priority inheritance.
• Responsive interrupt management.
• Dynamic memory allocation.
• Dynamic code loading using run-time link editing.
• File systems, IMFS, FAT, RFS, JFFS, NSFv4 (with LibBSD)
• High level of user configurability.
• Link-time configurable schedulers.
• Linker-set based initialization (similar to global C++ constructors).
• Drivers for I2C, SPI and LibBSD has NIC, USB, SD/MMC and Framebuffer.
• Open source with a friendly user license.

RTEMS Project:

• https://www.rtems.org/

Project git repositories are located at:

• https://gitlab.rtems.org/rtems/

Online documentation is available at:

• https://docs.rtems.org/

RTEMS Doxygen for CPUKit:

• https://docs.rtems.org/doxygen/main/

RTEMS POSIX 1003.1 Compliance Guide:

• https://docs.rtems.org/branches/main/posix-compliance/

RTEMS Discourse User forum for questions, answers and examples:

• https://users.rtems.org/

RTEMS Discord for support:

• https://www.rtems.org/discord/

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

• https://lists.rtems.org/mailman/listinfo

The version number for this software in releases is located in the VERSION file if present.