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2014-07-09score: Implement scheduler helping protocolSebastian Huber1-0/+2
The following scheduler operations return a thread in need for help - 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. Add a new ask for help scheduler operation. This operation is used by _Scheduler_Ask_for_help() to help threads in need for help returned by the operations mentioned above. This operation is also used by _Scheduler_Thread_change_resource_root() in case the root of a resource sub-tree changes. A use case is the ownership change of a resource. In case it is not possible to schedule a thread in need for help, then the corresponding scheduler node will be placed into the set of ready scheduler nodes of the scheduler instance. Once a state change from ready to scheduled happens for this scheduler node it may be used to schedule the thread in need for help.
2014-07-08score: Rename *_Node_get() to *_Thread_get_node()Sebastian Huber1-1/+1
This emphasizes that the scheduler node of a thread is returned and this is not a function working with scheduler nodes like the other *_Node_*() functions.
2014-06-04score: Replace _Scheduler_Allocate/Free()Sebastian Huber1-3/+1
Replace _Scheduler_Allocate() with _Scheduler_Node_initialize(). Remove the return status and thus the node initialization must be always successful. Rename _Scheduler_Free() to _Scheduler_Node_destroy().
2014-05-14score: Introduce scheduler nodesSebastian Huber1-9/+4
Rename scheduler per-thread information into scheduler nodes using Scheduler_Node as the base type. Use inheritance for specialized schedulers. Move the scheduler specific states from the thread control block into the scheduler node structure. Validate the SMP scheduler node state transitions in case RTEMS_DEBUG is defined.
2014-04-15score: Simplify thread control initializationSebastian Huber1-12/+6
The thread control block contains fields that point to application configuration dependent memory areas, like the scheduler information, the API control blocks, the user extension context table, the RTEMS notepads and the Newlib re-entrancy support. Account for these areas in the configuration and avoid extra workspace allocations for these areas. This helps also to avoid heap fragementation and reduces the per thread memory due to a reduced heap allocation overhead.
2014-04-15score: Static scheduler configurationSebastian Huber1-2/+2
Do not allocate the scheduler control structures from the workspace. This is a preparation step for configuration of clustered/partitioned schedulers on SMP.
2014-04-04score: Add scheduler control to scheduler opsSebastian Huber1-1/+4
Scheduler operations must be free of a global scheduler context to enable partitioned/clustered scheduling.
2014-03-21Change all references of rtems.com to rtems.org.Chris Johns1-1/+1
2012-11-30score misc: Score misc: Clean up Doxygen #9 (GCI 2012)Alex Ivanov1-0/+7
This patch is a task from GCI 2012 which improves the Doxygen comments in the RTEMS source. https://google-melange.appspot.com/gci/task/view/google/gci2012/7977211
2012-05-11Remove All CVS Id Strings Possible Using a ScriptJoel Sherrill1-2/+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.
2011-09-112011-09-11 Petr Benes <benesp16@fel.cvut.cz>Joel Sherrill1-0/+39
PR 1896/cpukit * sapi/include/confdefs.h, score/Makefile.am, score/preinstall.am: Add Earliest Deadline First (EDF) Scheduling Algorithm implementation. * score/include/rtems/score/scheduleredf.h, score/src/scheduleredf.c, score/src/scheduleredfallocate.c, score/src/scheduleredfblock.c, score/src/scheduleredfenqueue.c, score/src/scheduleredfenqueuefirst.c, score/src/scheduleredfextract.c, score/src/scheduleredffree.c, score/src/scheduleredfprioritycompare.c, score/src/scheduleredfreleasejob.c, score/src/scheduleredfschedule.c, score/src/scheduleredfunblock.c, score/src/scheduleredfupdate.c, score/src/scheduleredfyield.c: New files.