forked from Imagelibrary/rtems
ff20bc9816
This patch fixes an issue with the idle thread handling in the SMP scheduler framework used for the MrsP locking protocol. The approach to use a simple chain of unused idle threads is broken for schedulers which support thread to processor affinity. The reason is that the thread to processor affinity introduces another ordering indicator which may under certain conditions lead to a reordering of idle threads in the scheduled chain. This reordering is not propagated to the chain of unused idle threads. This could lead to use an idle thread for a sticky scheduler node which is already in use. This locks up the system in infinite loops in the thread context switch procedure. To fix this, the SMP scheduler implementations must now provide callbacks to get and release an unused idle thread. Update #4531.
Real-Time Executive for Multiprocessing Systems (RTEMS)
-------------------------------------------------------
RTEMS, Real-Time Executive for Multiprocessor Systems, 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 synchronization
- 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 https://git.rtems.org/
RTEMS Kernel: : https://git.rtems.org/rtems/
RTEMS Source Builder : https://git.rtems.org/rtems-source-builder/
RTEMS Tools : https://git.rtems.org/rtems-tools/
RTEMS Documentation : https://git.rtems.org/rtems-docs/
RTEMS FreeBSD : https://git.rtems.org/rtems-libbsd/
Online documentation is available at https://docs.rtems.org/
RTEMS User Manual : https://docs.rtems.org/branches/master/user/index.html
RTEMS RSB Manual : https://docs.rtems.org/branches/master/rsb/index.html
RTEMS Classic API : https://docs.rtems.org/branches/master/c-user/index.html
RTEMS POSIX API : https://docs.rtems.org/branches/master/posix-users/index.html
RTEMS Doxygen for CPUKit : https://docs.rtems.org/doxygen/branches/master/
RTEMS POSIX 1003.1 Compliance Guide :
https://docs.rtems.org/branches/master/posix-compliance/index.html
- Details the standards base functionality and profiles RTEMS supportsXo
RTEMS Developers Wiki : http://devel.rtems.org
- Bug reporting, community knowledge and tutorials.
RTEMS Mailing Lists : https://lists.rtems.org/mailman/listinfo
- The RTEMS Project maintains mailing lists which are used for most
discussions:
* For general-purpose questions related to using RTEMS, use the rtems-users
ml: https://lists.rtems.org/mailman/listinfo/users
* For questions and discussion related to development of RTEMS, use the
rtems-devel ml: https://lists.rtems.org/mailman/listinfo/devel
The version number for this software is indicated in the VERSION file.