Changeset f0c8501 in rtems

Timestamp:

07/11/14 07:47:05 (9 years ago)

Author:

Sebastian Huber <sebastian.huber@…>

Branches:

4.11, 5, master

Children:

1af8634a

Parents:

27783f6

git-author:

Sebastian Huber <sebastian.huber@…> (07/11/14 07:47:05)

git-committer:

Sebastian Huber <sebastian.huber@…> (07/11/14 07:55:33)

Message:

score: Scheduler helping proto for affinity sched

The priority affinity scheduler has the nice property that it can
produce more than one scheduled to ready state change in one operation.
Each scheduled to ready state change may lead to one thread in need for
help. Since it is currently only possible to return at most one thread
in need for help, we have a problem here.

A solution might be to move the check for migrations into the ask for
help mechanism.

File:

• cpukit/score/src/schedulerpriorityaffinitysmp.c (modified) (2 diffs)

cpukit/score/src/schedulerpriorityaffinitysmp.c

@@ -356 +356 @@
 
     /*
+     * FIXME: Do not consider threads using the scheduler helping protocol
+     * since this could produce more than one thread in need for help in one
+     * operation which is currently not possible.
+     */
+    if ( lowest_scheduled->help_state != SCHEDULER_HELP_YOURSELF )
+      break;
+
+    /*
      * But if we found a thread which is lower priority than one
      * in the ready set, then we need to swap them out.
@@ -363 +371 @@
       _Scheduler_SMP_Node_downcast( lowest_scheduled ),
       SCHEDULER_SMP_NODE_READY
+    );
+    _Scheduler_Thread_change_state(
+      _Scheduler_Node_get_user( lowest_scheduled ),
+      THREAD_SCHEDULER_READY
     );