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Sebastian Huber
0e1a26fc0a
The POSIX sporadic server takes the real priority node of a thread out of the priority aggregation while the thread runs at the low priority. _Scheduler_Set() extracts that node without a check. It skips the extract where a scheduler change inhibitor is present, and only an SMP build had one. A uniprocessor build with the POSIX API therefore extracted a node which sits in no tree. A debug build ended psx09 with a failed assertion in _RBTree_Extract() and a release build broke the priority aggregation of the thread. The sporadic server is a property of the POSIX API alone. Enable the scheduler change inhibitors wherever the POSIX API is enabled. rtems_task_set_scheduler() then returns RTEMS_RESOURCE_IN_USE for a sporadic server thread at both priorities, as it does in an SMP build. Closes #5745. Assisted-by: Claude:claude-opus-5 claude-code Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
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:
Project git repositories are located at:
Online documentation is available at:
RTEMS Doxygen for CPUKit:
RTEMS POSIX 1003.1 Compliance Guide:
RTEMS Discourse User forum for questions, answers and examples:
RTEMS Discord for support:
RTEMS Mailing Lists for general purpose use the users list and for developers use the devel list.
The version number for this software in releases is located in the VERSION file if present.