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42 lines
867 B
C
42 lines
867 B
C
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#ifndef __LINUX_BIT_SPINLOCK_H
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#define __LINUX_BIT_SPINLOCK_H
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#include <linux/kernel.h>
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#include <linux/preempt.h>
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#include <linux/atomic.h>
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#include <linux/bug.h>
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static inline void bit_spin_lock(int bitnum, unsigned long *addr)
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{
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while (unlikely(test_and_set_bit_lock(bitnum, addr))) {
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do {
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cpu_relax();
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} while (test_bit(bitnum, addr));
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}
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}
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static inline int bit_spin_trylock(int bitnum, unsigned long *addr)
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{
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return !test_and_set_bit_lock(bitnum, addr);
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}
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static inline void bit_spin_unlock(int bitnum, unsigned long *addr)
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{
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BUG_ON(!test_bit(bitnum, addr));
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clear_bit_unlock(bitnum, addr);
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}
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static inline void __bit_spin_unlock(int bitnum, unsigned long *addr)
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{
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bit_spin_unlock(bitnum, addr);
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}
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static inline int bit_spin_is_locked(int bitnum, unsigned long *addr)
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{
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return test_bit(bitnum, addr);
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}
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#endif /* __LINUX_BIT_SPINLOCK_H */
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