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