[RTEMS Project] #4544: The last processor must not be removed if it is owned by a helping scheduler

[RTEMS trac]

#4544: The last processor must not be removed if it is owned by a helping
scheduler
--------------------------------+------------------------------
 Reporter:  Sebastian Huber     |       Owner:  Sebastian Huber
     Type:  defect              |      Status:  assigned
 Priority:  normal              |   Milestone:  6.1
Component:  score               |     Version:  5
 Severity:  normal              |  Resolution:
 Keywords:  SMP, qualification  |  Blocked By:
 Blocking:                      |
--------------------------------+------------------------------

Comment (by Sebastian Huber <sebastian.huber@…>):

 In [changeset:"c69a70a597ec5df75a51bfa39c14198a5c5fb22e/rtems"
 c69a70a/rtems]:
 {{{
 #!CommitTicketReference repository="rtems"
 revision="c69a70a597ec5df75a51bfa39c14198a5c5fb22e"
 rtems: Fix rtems_scheduler_remove_processor()

 Return an error status for the following error condition in
 rtems_scheduler_remove_processor():

 While an attempt is made to remove a processor from a scheduler, while
 the processor is the only processor owned by the scheduler, if a thread
 exists which uses the scheduler as a helping scheduler, then the
 processor shall not be removed.

 The reason is that ask for help requests and withdraw node requests are
 processed asynchronously in any order.  An ask for help request carried
 out on a scheduler without a processor is undefined behaviour.

 Update error status description.

 Update #4544.
 }}}

--
Ticket URL: <http://devel.rtems.org/ticket/4544#comment:2>
RTEMS Project <http://www.rtems.org/>
RTEMS Project