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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-07-04 14:34:23 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-07-09 10:05:17 +0200 |
| commit | 5c3d2509593476869e791111cd3d93cc1e840b3a (patch) | |
| tree | 2f642fcce66748460f0f823fbeb6f292267b8cd0 /cpukit/score/include/rtems/score/schedulercbs.h | |
| parent | schedulerpriorityaffinitysmp.c: Add period at end of sentence (diff) | |
| download | rtems-5c3d2509593476869e791111cd3d93cc1e840b3a.tar.bz2 | |
score: Implement scheduler helping protocol
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.
Diffstat (limited to 'cpukit/score/include/rtems/score/schedulercbs.h')
| -rw-r--r-- | cpukit/score/include/rtems/score/schedulercbs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/cpukit/score/include/rtems/score/schedulercbs.h b/cpukit/score/include/rtems/score/schedulercbs.h index 008cc91261..b3381e0e43 100644 --- a/cpukit/score/include/rtems/score/schedulercbs.h +++ b/cpukit/score/include/rtems/score/schedulercbs.h @@ -53,6 +53,7 @@ extern "C" { _Scheduler_EDF_Block, /* block entry point */ \ _Scheduler_CBS_Unblock, /* unblock entry point */ \ _Scheduler_EDF_Change_priority, /* change priority entry point */ \ + SCHEDULER_OPERATION_DEFAULT_ASK_FOR_HELP \ _Scheduler_CBS_Node_initialize, /* node initialize entry point */ \ _Scheduler_default_Node_destroy, /* node destroy entry point */ \ _Scheduler_EDF_Update_priority, /* update priority entry point */ \ |