| Date | Tue, 25 Jan 2011 18:31:24 +0100 | From | Peter Zijlstra <> | Subject | [PATCH 13/25] mutex: Provide mutex_is_contended |
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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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