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[PATCH] add sem_is_read/write_locked()

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Add sem_is_read/write_locked functions to the read/write semaphores, along the
same lines of the *_is_locked spinlock functions.  The swap token tuning patch
uses sem_is_read_locked; sem_is_write_locked is added for completeness.

Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Rik Van Riel
2005-10-29 18:15:44 -07:00
committed by Linus Torvalds
parent 63f324cf07
commit eb92f4ef32
10 changed files with 50 additions and 0 deletions
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5
include/asm-sh/rwsem.h
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@@ -166,5 +166,10 @@ static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem)
return atomic_add_return(delta, (atomic_t *)(&sem->count));
}
static inline int rwsem_is_locked(struct rw_semaphore *sem)
{
return (sem->count != 0);
}
#endif /* __KERNEL__ */
#endif /* _ASM_SH_RWSEM_H */