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Commit eb92f4ef authored by Rik Van Riel's avatar Rik Van Riel Committed by Linus Torvalds
Browse files

[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: default avatarRik van Riel <riel@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 63f324cf

include/asm-alpha/rwsem.h

+5 −0
Original line number Diff line number Diff line
@@ -262,5 +262,10 @@ static inline long rwsem_atomic_update(long val, struct rw_semaphore *sem) 
#endif

}



static inline int rwsem_is_locked(struct rw_semaphore *sem)

{

	return (sem->count != 0);

}



#endif /* __KERNEL__ */

#endif /* _ALPHA_RWSEM_H */

include/asm-i386/rwsem.h

+5 −0
Original line number Diff line number Diff line
@@ -284,5 +284,10 @@ LOCK_PREFIX "xadd %0,(%2)" 
	return tmp+delta;

}



static inline int rwsem_is_locked(struct rw_semaphore *sem)

{

	return (sem->count != 0);

}



#endif /* __KERNEL__ */

#endif /* _I386_RWSEM_H */

include/asm-ia64/rwsem.h

+5 −0
Original line number Diff line number Diff line
@@ -186,4 +186,9 @@ __downgrade_write (struct rw_semaphore *sem) 
#define rwsem_atomic_add(delta, sem)	atomic64_add(delta, (atomic64_t *)(&(sem)->count))

#define rwsem_atomic_update(delta, sem)	atomic64_add_return(delta, (atomic64_t *)(&(sem)->count))



static inline int rwsem_is_locked(struct rw_semaphore *sem)

{

	return (sem->count != 0);

}



#endif /* _ASM_IA64_RWSEM_H */

include/asm-ppc/rwsem.h

+5 −0
Original line number Diff line number Diff line
@@ -168,5 +168,10 @@ 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 /* _PPC_RWSEM_XADD_H */

include/asm-ppc64/rwsem.h

+5 −0
Original line number Diff line number Diff line
@@ -163,5 +163,10 @@ 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 /* _PPC_RWSEM_XADD_H */