mutex: add atomic_dec_and_mutex_lock()

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Much like the atomic_dec_and_lock() function in which we take an hold a
spin_lock if we drop the atomic to 0 this function takes and holds the
mutex if we dec the atomic to 0.

Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Orig-LKML-Reference: <20090323172417.410913479@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Eric Paris 2009-03-23 18:22:09 +01:00 • committed by Ingo Molnar

parent 37d8182838

commit 9ab772cd53

1 changed files with 23 additions and 0 deletions

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23

include/linux/mutex.h

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