Add ability to add/remove processors to/from a scheduler instance

[Sebastian Huber]

The scheduler configuration is done at link-time. In order to support run-time re-configuration add functions to dd/remove processors to/from a scheduler instance.

/**
 * @brief Adds a processor the set of processors owned by the scheduler.
 *
 * Must be called from task context.  This operation obtains and releases the
 * objects allocator lock.
 *
 * @param[in] scheduler_id Identifier of the scheduler.
 * @param[in] cpu_index Index of the processor to add.
 *
 * @retval RTEMS_SUCCESSFUL Successful operation.
 * @retval RTEMS_INVALID_ID Invalid scheduler identifier.
 * @retval RTEMS_NOT_CONFIGURED The processor is not configured to be used by
 *   the application.
 * @retval RTEMS_INCORRECT_STATE The processor is configured to be used by
 *   the application, however, it is not available.
 */
rtems_status_code rtems_scheduler_add_processor(
  rtems_id scheduler_id,
  uint32_t cpu_index
);

/**
 * @brief Removes a processor from set of processors owned by the scheduler.
 *
 * Must be called from task context.  This operation obtains and releases the
 * objects allocator lock.  Removing a processor from a scheduler is a complex
 * operation that involves all tasks in the system.
 *
 * @param[in] scheduler_id Identifier of the scheduler.
 * @param[in] cpu_index Index of the processor to add.
 *
 * @retval RTEMS_SUCCESSFUL Successful operation.
 * @retval RTEMS_INVALID_ID Invalid scheduler identifier.
 * @retval RTEMS_INVALID_NUMBER The processor is not owned by the scheduler.
 * @retval RTEMS_RESOURCE_IN_USE The set of processors owned by the scheduler
 *   would be empty after the processor removal and there exists a non-idle
 *   task that uses this scheduler as its home scheduler.
 */
rtems_status_code rtems_scheduler_remove_processor(
  rtems_id scheduler_id,
  uint32_t cpu_index
);

[Sebastian Huber <sebastian.huber@…>]

In 2612a0bf5b9f0105315d62cbacfa9d29a5caa4b5/rtems:

score: Simplify _Scheduler_Get_by_id()

Avoid dead code in non-SMP configurations. Return scheduler identifier
independent of the current processor count of the scheduler via
rtems_scheduler_ident(), since this value may change during run-time.
Check the processor count in _Scheduler_Set() under scheduler lock
protection.

Update #2797.

[Sebastian Huber <sebastian.huber@…>]

In 1c46b80329d5d099022d8c7e0a8c593845120729/rtems:

score: Add scheduler to per-CPU information

This makes it possible to adjust the scheduler of a processor at
run-time.

Update #2797.

[Sebastian Huber <sebastian.huber@…>]

In e6107854b2511decef8c209cde14c4826a33ff01/rtems:

score: Rename _Scheduler_Assignments

Rename _Scheduler_Assignments into _Scheduler_Initial_assignments to
make it clear that they may not reflect the run-time scheduler
assignment.

Update #2797.

[Sebastian Huber <sebastian.huber@…>]

In 1f5bee3d85405d42a7f35caf3ff0c190789afd60/rtems:

score: Add and use Thread_Control::is_idle

Update #2797.

[Sebastian Huber <sebastian.huber@…>]

In 05ca53ddf6bc8333c2f3ad861c5415467c3262d2/rtems:

rtems: Add scheduler processor add/remove

Update #2797.

[Sebastian Huber]

[bcdca5db9d35138c9c97055b6e71621c451d9542/rtems-docs]

[Sebastian Huber <sebastian.huber@…>]

In d10716f98f950348cf25df9097402987b6e219fc/rtems:

rtems: Fix rtems_scheduler_add_processor()

Fix thread dispatch profiling of rtems_scheduler_add_processor().

Update #2797.

[Sebastian Huber <sebastian.huber@…>]

In 7da78cf637e5d039fd1e0aafd99b282626f9e266/rtems:

rtems: Use _Thread_Dispatch_direct()

Update #2797.

[Sebastian Huber]

Milestone renamed