move task present flag from PFAIR to Litmus core

Other quantum-based plugins also require the present flag. Hence,
move it to the core data structure

2 files changed, 9 insertions, 0 deletions

diff --git a/include/litmus/litmus.h b/include/litmus/litmus.h
index 7ef5a62d67..6f82947bcf 100644
--- a/include/litmus/litmus.h
+++ b/include/litmus/litmus.h
@@ -198,6 +198,12 @@ static inline int is_np(struct task_struct *t)
 
 #endif
 
+static inline int is_present(struct task_struct* t)
+{
+        return t && tsk_rt(t)->present;
+}
+
+
 /* make the unit explicit */
 typedef unsigned long quanta_t;
 
diff --git a/include/litmus/rt_param.h b/include/litmus/rt_param.h
index 403ebc8cc9..26b2a4b45e 100644
--- a/include/litmus/rt_param.h
+++ b/include/litmus/rt_param.h
@@ -77,6 +77,9 @@ struct rt_param {
         /* do we need to check for srp blocking? */
         unsigned int            srp_non_recurse:1;
 
+        /* is the task present? (true if it can be scheduled) */
+        unsigned int            present:1;
+
         /* user controlled parameters */
         struct rt_task          task_params;