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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/linux/rwsem-spinlock.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/linux/rwsem-spinlock.h')
| -rw-r--r-- | include/linux/rwsem-spinlock.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/rwsem-spinlock.h b/include/linux/rwsem-spinlock.h index b52a2af25f1f..f30f805080ae 100644 --- a/include/linux/rwsem-spinlock.h +++ b/include/linux/rwsem-spinlock.h @@ -61,5 +61,10 @@ extern void FASTCALL(__up_read(struct rw_semaphore *sem)); extern void FASTCALL(__up_write(struct rw_semaphore *sem)); extern void FASTCALL(__downgrade_write(struct rw_semaphore *sem)); +static inline int rwsem_is_locked(struct rw_semaphore *sem) +{ + return (sem->activity != 0); +} + #endif /* __KERNEL__ */ #endif /* _LINUX_RWSEM_SPINLOCK_H */ |