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91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/*-
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* Copyright (c) 2020 The FreeBSD Foundation
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*
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* This software was developed by Emmanuel Vadot under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _LINUXKPI_LINUX_REFCOUNT_H
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#define _LINUXKPI_LINUX_REFCOUNT_H
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#include <linux/atomic.h>
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struct refcount_linux {
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atomic_t value;
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};
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typedef struct refcount_linux refcount_t;
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static inline void
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refcount_set(refcount_t *ref, unsigned int i)
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{
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atomic_set(&ref->value, i);
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}
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static inline void
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refcount_inc(refcount_t *ref)
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{
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atomic_inc(&ref->value);
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}
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static inline bool
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refcount_inc_not_zero(refcount_t *ref)
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{
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return (atomic_inc_not_zero(&ref->value));
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}
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static inline void
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refcount_dec(refcount_t *ref)
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{
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atomic_dec(&ref->value);
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}
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static inline unsigned int
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refcount_read(refcount_t *ref)
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{
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return atomic_read(&ref->value);
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}
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static inline bool
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refcount_dec_and_lock_irqsave(refcount_t *ref, spinlock_t *lock,
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unsigned long *flags)
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{
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if (atomic_dec_and_test(&ref->value) == true) {
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spin_lock_irqsave(lock, flags);
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return (true);
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}
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return (false);
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}
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/*
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* struct kref uses atomic_t and not refcount_t so
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* we differ from Linux here.
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*/
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static inline bool
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refcount_dec_and_test(atomic_t *r)
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{
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return (atomic_dec_and_test(r));
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}
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#endif /* __LINUXKPI_LINUX_REFCOUNT_H__ */
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