Add a function to query whether a task is currently running on any cpu.
Signed-off-by: Markus Metzger <[email protected]>
---
Index: git-tip/include/linux/sched.h
===================================================================
--- git-tip.orig/include/linux/sched.h 2009-03-30 13:31:10.000000000 +0200
+++ git-tip/include/linux/sched.h 2009-03-30 13:36:56.000000000 +0200
@@ -2280,6 +2280,7 @@ static inline void set_task_cpu(struct t
#endif /* CONFIG_SMP */
+extern int task_is_running(struct task_struct *p);
extern void arch_pick_mmap_layout(struct mm_struct *mm);
#ifdef CONFIG_TRACING
Index: git-tip/kernel/sched.c
===================================================================
--- git-tip.orig/kernel/sched.c 2009-03-30 13:30:56.000000000 +0200
+++ git-tip/kernel/sched.c 2009-03-30 13:47:39.000000000 +0200
@@ -1933,6 +1933,22 @@ migrate_task(struct task_struct *p, int
}
/*
+ * Is the task currently running on any cpu?
+ */
+int task_is_running(struct task_struct *p)
+{
+ struct rq *rq;
+ unsigned long flags;
+ int running;
+
+ rq = task_rq_lock(p, &flags);
+ running = task_running(rq, p);
+ task_rq_unlock(rq, &flags);
+
+ return running;
+}
+
+/*
* wait_task_inactive - wait for a thread to unschedule.
*
* If @match_state is nonzero, it's the @p->state value just checked and
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