[RTEMS Project] #3237: Fix priority ceiling updates

[RTEMS trac]

#3237: Fix priority ceiling updates
-----------------------------+-----------------------------
 Reporter:  Sebastian Huber  |      Owner:  Sebastian Huber
     Type:  defect           |     Status:  assigned
 Priority:  normal           |  Milestone:  5.1
Component:  score            |    Version:  5
 Severity:  normal           |   Keywords:
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 We must not clear the priority updates in _Thread_queue_Extract_locked()
 since this function is used by the priority ceiling surrender operations
 after the ceiling priority handover from the previous owner to the new
 owner. This is especially important in SMP configurations.

 Move the _Thread_queue_Context_clear_priority_updates() invocation to the
 callers.

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Ticket URL: <http://devel.rtems.org/ticket/3237>
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