Changeset 5c3d250 in rtems
- Timestamp:
-
07/04/14 12:34:23
(10 years ago)
- Author:
- Sebastian Huber <sebastian.huber@…>
- Branches:
- 4.11, 5, master
- Children:
- 9f228bea
- Parents:
- 52f8e90d
- git-author:
- Sebastian Huber <sebastian.huber@…> (07/04/14 12:34:23)
- git-committer:
- Sebastian Huber <sebastian.huber@…> (07/09/14 08:05:17)
- Message:
-
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.
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