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45 lines
1.2 KiB
45 lines
1.2 KiB
#ifndef _ASM_GENERIC_BITOPS_LOCK_H_ |
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#define _ASM_GENERIC_BITOPS_LOCK_H_ |
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/** |
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* test_and_set_bit_lock - Set a bit and return its old value, for lock |
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* @nr: Bit to set |
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* @addr: Address to count from |
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* |
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* This operation is atomic and provides acquire barrier semantics. |
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* It can be used to implement bit locks. |
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*/ |
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#define test_and_set_bit_lock(nr, addr) test_and_set_bit(nr, addr) |
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/** |
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* clear_bit_unlock - Clear a bit in memory, for unlock |
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* @nr: the bit to set |
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* @addr: the address to start counting from |
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* |
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* This operation is atomic and provides release barrier semantics. |
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*/ |
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#define clear_bit_unlock(nr, addr) \ |
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do { \ |
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smp_mb__before_atomic(); \ |
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clear_bit(nr, addr); \ |
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} while (0) |
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/** |
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* __clear_bit_unlock - Clear a bit in memory, for unlock |
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* @nr: the bit to set |
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* @addr: the address to start counting from |
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* |
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* A weaker form of clear_bit_unlock() as used by __bit_lock_unlock(). If all |
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* the bits in the word are protected by this lock some archs can use weaker |
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* ops to safely unlock. |
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* |
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* See for example x86's implementation. |
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*/ |
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#define __clear_bit_unlock(nr, addr) \ |
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do { \ |
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smp_mb__before_atomic(); \ |
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clear_bit(nr, addr); \ |
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} while (0) |
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#endif /* _ASM_GENERIC_BITOPS_LOCK_H_ */ |
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