111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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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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* $FreeBSD$
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*/
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#ifndef _SYS_CCOMPAT_H
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#define _SYS_CCOMPAT_H
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struct hlist_node {
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struct hlist_node *next, **pprev;
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};
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struct hlist_head {
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struct hlist_node *first;
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};
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typedef struct {
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volatile int counter;
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} atomic_t;
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#define hlist_for_each(p, head) \
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for (p = (head)->first; p; p = (p)->next)
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#define hlist_entry(ptr, type, field) container_of(ptr, type, field)
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#define container_of(ptr, type, member) \
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/* CSTYLED */ \
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({ \
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const __typeof(((type *)0)->member) *__p = (ptr); \
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(type *)((uintptr_t)__p - offsetof(type, member)); \
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})
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static inline void
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hlist_add_head(struct hlist_node *n, struct hlist_head *h)
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{
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n->next = h->first;
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if (h->first != NULL)
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h->first->pprev = &n->next;
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WRITE_ONCE(h->first, n);
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n->pprev = &h->first;
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}
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static inline void
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hlist_del(struct hlist_node *n)
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{
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WRITE_ONCE(*(n->pprev), n->next);
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if (n->next != NULL)
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n->next->pprev = n->pprev;
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}
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/* BEGIN CSTYLED */
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#define READ_ONCE(x) ({ \
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__typeof(x) __var = ({ \
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barrier(); \
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ACCESS_ONCE(x); \
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}); \
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barrier(); \
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__var; \
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})
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#define HLIST_HEAD_INIT { }
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#define HLIST_HEAD(name) struct hlist_head name = HLIST_HEAD_INIT
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#define INIT_HLIST_HEAD(head) (head)->first = NULL
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#define INIT_HLIST_NODE(node) \
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do { \
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(node)->next = NULL; \
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(node)->pprev = NULL; \
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} while (0)
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/* END CSTYLED */
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static inline int
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atomic_read(const atomic_t *v)
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{
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return (READ_ONCE(v->counter));
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}
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static inline int
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atomic_inc(atomic_t *v)
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{
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return (atomic_fetchadd_int(&v->counter, 1) + 1);
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}
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static inline int
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atomic_dec(atomic_t *v)
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{
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return (atomic_fetchadd_int(&v->counter, -1) - 1);
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}
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#endif
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