rt_domain_t: add add_release_on()

This API addition allows the calling code to override
the release master for a given rt_domain_t object. This
is particularly useful if a job is supposed to migrate
to a particular CPU. This need arises for example in semi-
partitioned schedulers.

1 files changed, 15 insertions, 1 deletions

diff --git a/include/litmus/rt_domain.h b/include/litmus/rt_domain.h
index 59e6b54e9281..ac249292e866 100644
--- a/include/litmus/rt_domain.h
+++ b/include/litmus/rt_domain.h
@@ -143,12 +143,26 @@ static inline struct task_struct* take_ready(rt_domain_t* rt)
 static inline void add_release(rt_domain_t* rt, struct task_struct *task)
 {
         unsigned long flags;
-        /* first we need the write lock for rt_ready_queue */
         raw_spin_lock_irqsave(&rt->tobe_lock, flags);
         __add_release(rt, task);
         raw_spin_unlock_irqrestore(&rt->tobe_lock, flags);
 }
 
+#ifdef CONFIG_RELEASE_MASTER
+void __add_release_on(rt_domain_t* rt, struct task_struct *task,
+                      int target_cpu);
+
+static inline void add_release_on(rt_domain_t* rt,
+                                  struct task_struct *task,
+                                  int target_cpu)
+{
+        unsigned long flags;
+        raw_spin_lock_irqsave(&rt->tobe_lock, flags);
+        __add_release_on(rt, task, target_cpu);
+        raw_spin_unlock_irqrestore(&rt->tobe_lock, flags);
+}
+#endif
+
 static inline int __jobs_pending(rt_domain_t* rt)
 {
         return !bheap_empty(&rt->ready_queue);