score: Fix a release/cancel job race condition

Split up the potential thread priority change in the scheduler
release/cancel job operation.  Protect the rate monotonic period state
with a dedicated SMP lock.  This avoids a race condition during
_Rate_monotonic_Timeout() while _Rate_monotonic_Cancel() is called on
another processor.

1 files changed, 2 insertions, 15 deletions

diff --git a/cpukit/score/include/rtems/score/scheduleredf.h b/cpukit/score/include/rtems/score/scheduleredf.h
index 5d9b4359c4..81b245e391 100644
--- a/cpukit/score/include/rtems/score/scheduleredf.h
+++ b/cpukit/score/include/rtems/score/scheduleredf.h
@@ -215,26 +215,13 @@ Scheduler_Void_or_thread _Scheduler_EDF_Yield(
   Thread_Control          *the_thread
 );
 
-/**
- *  @brief Called when a new job of task is released.
- *
- *  This routine is called when a new job of task is released.
- *  It is called only from Rate Monotonic manager in the beginning
- *  of new period.
- *
- *  @param[in] scheduler The scheduler instance.
- *  @param[in] the_thread is the owner of the job.
- *  @param[in] deadline of the new job from now. If equal to 0,
- *             the job was cancelled or deleted, thus a running task
- *             has to be suspended.
- */
-void _Scheduler_EDF_Release_job(
+Thread_Control *_Scheduler_EDF_Release_job(
   const Scheduler_Control *scheduler,
   Thread_Control          *the_thread,
   uint64_t                 deadline
 );
 
-void _Scheduler_EDF_Cancel_job(
+Thread_Control *_Scheduler_EDF_Cancel_job(
   const Scheduler_Control *scheduler,
   Thread_Control          *the_thread
 );