score: Indroduce cancel job scheduler operation

Do not use a deadline value of zero to indicate a job cancellation.  Use
a dedicated scheduler operation for this.

1 files changed, 17 insertions, 0 deletions

diff --git a/cpukit/score/include/rtems/score/scheduler.h b/cpukit/score/include/rtems/score/scheduler.h
index 120fdfd239..c8a7f87541 100644
--- a/cpukit/score/include/rtems/score/scheduler.h
+++ b/cpukit/score/include/rtems/score/scheduler.h
@@ -145,6 +145,12 @@ typedef struct {
     uint64_t
   );
 
+  /** @see _Scheduler_Cancel_job() */
+  void ( *cancel_job ) (
+    const Scheduler_Control *,
+    Thread_Control *
+  );
+
   /** @see _Scheduler_Tick() */
   void ( *tick )( const Scheduler_Control *, Thread_Control * );
 
@@ -535,6 +541,17 @@ void _Scheduler_default_Release_job(
 );
 
 /**
+ * @brief Does nothing.
+ *
+ * @param[in] scheduler Unused.
+ * @param[in] the_thread Unused.
+ */
+void _Scheduler_default_Cancel_job(
+  const Scheduler_Control *scheduler,
+  Thread_Control          *the_thread
+);
+
+/**
  * @brief Performs tick operations depending on the CPU budget algorithm for
  * each executing thread.
  *