Messages in this thread Patch in this message | | | Date | Mon, 18 Oct 2010 13:24:50 +0200 | From | Peter Zijlstra <> | Subject | [PATCH 17/20] mutex: Provide mutex_is_contended |
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Usable for lock-breaks and such.
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 @@ -118,6 +118,11 @@ 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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