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| author | Rik Van Riel <riel@redhat.com> | 2005-10-29 18:15:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-29 21:40:35 -0700 |
| commit | eb92f4ef320b738e41ad43476a5d05c8a20d5cc7 (patch) | |
| tree | f9a6bb78a0561587f142b2b1208819f6cffe9835 /include/asm-sh/rwsem.h | |
| parent | 63f324cf0792ed69089b79d6921ba3aaea97af50 (diff) | |
| download | linux-eb92f4ef320b738e41ad43476a5d05c8a20d5cc7.tar.gz linux-eb92f4ef320b738e41ad43476a5d05c8a20d5cc7.tar.bz2 linux-eb92f4ef320b738e41ad43476a5d05c8a20d5cc7.zip | |
[PATCH] add sem_is_read/write_locked()
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>
Diffstat (limited to 'include/asm-sh/rwsem.h')
| -rw-r--r-- | include/asm-sh/rwsem.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/asm-sh/rwsem.h b/include/asm-sh/rwsem.h index 1be4337f5259..0262d3d1e5e0 100644 --- a/include/asm-sh/rwsem.h +++ b/include/asm-sh/rwsem.h @@ -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 */ |