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Subject[PATCH 13/25] mutex: Provide mutex_is_contended
Usable for lock-breaks and such.

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
include/linux/mutex.h | 5 +++++
1 file changed, 5 insertions(+)
Index: linux-2.6/include/linux/mutex.h
===================================================================
--- linux-2.6.orig/include/linux/mutex.h
+++ linux-2.6/include/linux/mutex.h
@@ -126,6 +126,11 @@ static inline int mutex_is_locked(struct
return atomic_read(&lock->count) != 1;
}

+static inline int mutex_is_contended(struct mutex *lock)
+{
+ return atomic_read(&lock->count) < 0;
+}
+
/*
* See kernel/mutex.c for detailed documentation of these APIs.
* Also see Documentation/mutex-design.txt.



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