linux-kernel - [patch 2/21] sched: add task_is

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Message-ID: <20090331145351.A12494@sedona.ch.intel.com>
Date:	Tue, 31 Mar 2009 14:53:51 +0200
From:	Markus Metzger <markus.t.metzger@...el.com>
To:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com
Cc:	markus.t.metzger@...el.com, markus.t.metzger@...il.com,
	roland@...hat.com, eranian@...glemail.com, oleg@...hat.com,
	juan.villacis@...el.com, ak@...ux.jf.intel.com
Subject: [patch 2/21] sched: add task_is_running() fucntion to sched.h

Add a function to query whether a task is currently running on any cpu.


Signed-off-by: Markus Metzger <markus.t.metzger@...el.com>
---

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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