[PARISC] More useful readwrite lock helpers
spinlock.c needs _can_lock helpers. Rewrite _is_locked helpers to be _can_lock helpers. Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
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@ -134,14 +134,22 @@ static __inline__ int __raw_write_trylock(raw_rwlock_t *rw)
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return 1;
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return 1;
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}
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}
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static __inline__ int __raw_is_read_locked(raw_rwlock_t *rw)
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/*
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* read_can_lock - would read_trylock() succeed?
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* @lock: the rwlock in question.
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*/
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static __inline__ int __raw_read_can_lock(raw_rwlock_t *rw)
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{
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{
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return rw->counter > 0;
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return rw->counter >= 0;
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}
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}
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static __inline__ int __raw_is_write_locked(raw_rwlock_t *rw)
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/*
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* write_can_lock - would write_trylock() succeed?
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* @lock: the rwlock in question.
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*/
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static __inline__ int __raw_write_can_lock(raw_rwlock_t *rw)
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{
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{
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return rw->counter < 0;
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return !rw->counter;
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}
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}
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#endif /* __ASM_SPINLOCK_H */
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#endif /* __ASM_SPINLOCK_H */
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