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* score: Improve scheduler helping protocolSebastian Huber2017-02-031-3/+1
| | | | | | | | | | | Only register ask for help requests in the scheduler unblock and yield operations. The actual ask for help operation is carried out during _Thread_Do_dispatch() on a processor related to the thread. This yields a better separation of scheduler instances. A thread of one scheduler instance should not be forced to carry out too much work for threads on other scheduler instances. Update #2556.
* score: Simplify yield and unblock scheduler opsSebastian Huber2016-11-021-2/+2
| | | | Update #2556.
* score: Pass scheduler node to unblock operationSebastian Huber2016-11-021-1/+4
| | | | | | Changed for consistency with other scheduler operations. Update #2556.
* score: Introduce _Thread_Get_priority()Sebastian Huber2016-09-081-4/+6
| | | | Avoid direct access to thread internal data fields.
* score: Update _Thread_Heir only if necessarySebastian Huber2015-03-051-4/+4
| | | | | | | | | | | | | | | | | | | | Previously, the _Thread_Heir was updated unconditionally in case a new heir was determined. The _Thread_Dispatch_necessary was only updated in case the executing thread was preemptible or an internal thread was unblocked. Change this to update the _Thread_Heir and _Thread_Dispatch_necessary only in case the currently selected heir thread is preemptible or a dispatch is forced. Move the schedule decision into the change priority operation and use the schedule operation only in rtems_task_mode() in case preemption is enabled or an ASR dispatch is necessary. This is a behaviour change. Previously, the RTEMS_NO_PREEMPT also prevented signal delivery in certain cases (not always). Now, signal delivery is no longer influenced by RTEMS_NO_PREEMPT. Since the currently selected heir thread is used to determine if a new heir is chosen, non-preemptible heir threads currently not executing now prevent a new heir. This may have an application impact, see change test tm04. Document this change in sp04. Update #2273.
* score: Need for help indicator for scheduler opsSebastian Huber2014-07-081-1/+3
| | | | | | | | | | | | | Return a thread in need for help for the following scheduler operations - unblock, - change priority, and - yield. A thread in need for help is a thread that encounters a scheduler state change from scheduled to ready or a thread that cannot be scheduled in an unblock operation. Such a thread can ask threads which depend on resources owned by this thread for help.
* score: Simplify _Thread_Change_priority()Sebastian Huber2014-05-151-1/+4
| | | | | | | | | | | | | | | | | | | | | | | | The function to change a thread priority was too complex. Simplify it with a new scheduler operation. This increases the average case performance due to the simplified logic. The interrupt disabled critical section is a bit prolonged since now the extract, update and enqueue steps are executed atomically. This should however not impact the worst-case interrupt latency since at least for the Deterministic Priority Scheduler this sequence can be carried out with a wee bit of instructions and no loops. Add _Scheduler_Change_priority() to replace the sequence of - _Thread_Set_transient(), - _Scheduler_Extract(), - _Scheduler_Enqueue(), and - _Scheduler_Enqueue_first(). Delete STATES_TRANSIENT, _States_Is_transient() and _Thread_Set_transient() since this state is now superfluous. With this change it is possible to get rid of the SCHEDULER_SMP_NODE_IN_THE_AIR state. This considerably simplifies the implementation of the new SMP locking protocols.
* score: Static scheduler configurationSebastian Huber2014-04-151-5/+3
| | | | | | Do not allocate the scheduler control structures from the workspace. This is a preparation step for configuration of clustered/partitioned schedulers on SMP.
* score: Add scheduler control to scheduler opsSebastian Huber2014-04-041-1/+2
| | | | | Scheduler operations must be free of a global scheduler context to enable partitioned/clustered scheduling.
* Change all references of rtems.com to rtems.org.Chris Johns2014-03-211-1/+1
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* score misc: Score misc: Clean up Doxygen #11 (GCI 2012)Daniel Georgiev2012-12-011-2/+7
| | | | | | | This patch is a task from GCI 2012 which improves the Doxygen comments in the RTEMS source. http://www.google-melange.com/gci/task/view/google/gci2012/8013204
* Remove All CVS Id Strings Possible Using a ScriptJoel Sherrill2012-05-111-2/+0
| | | | | | | | | | | | Script does what is expected and tries to do it as smartly as possible. + remove occurrences of two blank comment lines next to each other after Id string line removed. + remove entire comment blocks which only exited to contain CVS Ids + If the processing left a blank line at the top of a file, it was removed.
* 2011-05-12 Joel Sherrill <joel.sherrilL@OARcorp.com>Joel Sherrill2011-05-121-1/+1
| | | | | | | | | | | * score/include/rtems/score/schedulersimple.h, score/inline/rtems/score/schedulersimple.inl, score/src/schedulersimpleenqueue.c, score/src/schedulersimpleenqueuefirst.c, score/src/schedulersimplereadyqueueenqueue.c, score/src/schedulersimplereadyqueueenqueuefirst.c, score/src/schedulersimpleunblock.c: Correct names as pointed out by Gedare.
* 2011-03-16 Jennifer Averett <jennifer.averett@OARcorp.com>Joel Sherrill2011-03-161-0/+47
PR 1743/cpu * sapi/include/confdefs.h, score/Makefile.am, score/preinstall.am: Add Simple Priority Scheduler as complement to existing Deterministic Priority Scheduler. This scheduler serves both as an example and as a lighter weight implementation for smaller systems. * score/include/rtems/score/schedulersimple.h, score/inline/rtems/score/schedulersimple.inl, score/src/schedulersimple.c, score/src/schedulersimpleblock.c, score/src/schedulersimpleenqueue.c, score/src/schedulersimpleenqueuefirst.c, score/src/schedulersimpleextract.c, score/src/schedulersimplereadyqueueenqueue.c, score/src/schedulersimplereadyqueueenqueuefirst.c, score/src/schedulersimpleschedule.c, score/src/schedulersimpleunblock.c, score/src/schedulersimpleyield.c: New files.
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