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lib/dec_and_lock.c
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// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/export.h> |
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#include <linux/spinlock.h> |
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#include <linux/atomic.h> |
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/* * This is an implementation of the notion of "decrement a * reference count, and return locked if it decremented to zero". * |
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* NOTE NOTE NOTE! This is _not_ equivalent to * * if (atomic_dec_and_test(&atomic)) { * spin_lock(&lock); * return 1; * } * return 0; * * because the spin-lock and the decrement must be * "atomic". |
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*/ |
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int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock) { |
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/* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */ if (atomic_add_unless(atomic, -1, 1)) return 0; |
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/* Otherwise do it the slow way */ |
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spin_lock(lock); if (atomic_dec_and_test(atomic)) return 1; spin_unlock(lock); return 0; } EXPORT_SYMBOL(_atomic_dec_and_lock); |
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int _atomic_dec_and_lock_irqsave(atomic_t *atomic, spinlock_t *lock, unsigned long *flags) { /* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */ if (atomic_add_unless(atomic, -1, 1)) return 0; /* Otherwise do it the slow way */ spin_lock_irqsave(lock, *flags); if (atomic_dec_and_test(atomic)) return 1; spin_unlock_irqrestore(lock, *flags); return 0; } EXPORT_SYMBOL(_atomic_dec_and_lock_irqsave); |