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/* $OpenBSD: srp.h,v 1.15 2020/05/09 10:18:27 jca Exp $ */
/*
* Copyright (c) 2014 Jonathan Matthew <jmatthew@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _SYS_SRP_H_
#define _SYS_SRP_H_
#include <sys/refcnt.h>
#ifndef __upunused
#ifdef MULTIPROCESSOR
#define __upunused
#else
#define __upunused __attribute__((__unused__))
#endif
#endif /* __upunused */
struct srp {
void *ref;
};
#define SRP_INITIALIZER() { NULL }
struct srp_hazard {
struct srp *sh_p;
void *sh_v;
};
struct srp_ref {
struct srp_hazard *hz;
} __upunused;
#define SRP_HAZARD_NUM 16
struct srp_gc {
void (*srp_gc_dtor)(void *, void *);
void *srp_gc_cookie;
struct refcnt srp_gc_refcnt;
};
#define SRP_GC_INITIALIZER(_d, _c) { (_d), (_c), REFCNT_INITIALIZER() }
/*
* singly linked list built by following srps
*/
struct srpl_rc {
void (*srpl_ref)(void *, void *);
struct srp_gc srpl_gc;
};
#define srpl_cookie srpl_gc.srp_gc_cookie
#define SRPL_RC_INITIALIZER(_r, _u, _c) { _r, SRP_GC_INITIALIZER(_u, _c) }
struct srpl {
struct srp sl_head;
};
#define SRPL_HEAD(name, type) struct srpl
#define SRPL_ENTRY(type) \
struct { \
struct srp se_next; \
}
#ifdef _KERNEL
void srp_startup(void);
void srp_gc_init(struct srp_gc *, void (*)(void *, void *), void *);
void *srp_swap_locked(struct srp *, void *);
void srp_update_locked(struct srp_gc *, struct srp *, void *);
void *srp_get_locked(struct srp *);
void srp_gc_finalize(struct srp_gc *);
void srp_init(struct srp *);
#ifdef MULTIPROCESSOR
void *srp_swap(struct srp *, void *);
void srp_update(struct srp_gc *, struct srp *, void *);
void srp_finalize(void *, const char *);
void *srp_enter(struct srp_ref *, struct srp *);
void *srp_follow(struct srp_ref *, struct srp *);
void srp_leave(struct srp_ref *);
#else /* MULTIPROCESSOR */
static inline void *
srp_enter(struct srp_ref *sr, struct srp *srp)
{
sr->hz = NULL;
return srp->ref;
}
#define srp_swap(_srp, _v) srp_swap_locked((_srp), (_v))
#define srp_update(_gc, _srp, _v) srp_update_locked((_gc), (_srp), (_v))
#define srp_finalize(_v, _wchan) ((void)0)
#define srp_follow(_sr, _srp) srp_enter(_sr, _srp)
#define srp_leave(_sr) do { } while (0)
#endif /* MULTIPROCESSOR */
void srpl_rc_init(struct srpl_rc *, void (*)(void *, void *),
void (*)(void *, void *), void *);
#define SRPL_INIT(_sl) srp_init(&(_sl)->sl_head)
#define SRPL_FIRST(_sr, _sl) srp_enter((_sr), &(_sl)->sl_head)
#define SRPL_NEXT(_sr, _e, _ENTRY) srp_enter((_sr), &(_e)->_ENTRY.se_next)
#define SRPL_FOLLOW(_sr, _e, _ENTRY) srp_follow((_sr), &(_e)->_ENTRY.se_next)
#define SRPL_FOREACH(_c, _sr, _sl, _ENTRY) \
for ((_c) = SRPL_FIRST(_sr, _sl); \
(_c) != NULL; \
(_c) = SRPL_FOLLOW(_sr, _c, _ENTRY))
#define SRPL_LEAVE(_sr) srp_leave((_sr))
#define SRPL_FIRST_LOCKED(_sl) srp_get_locked(&(_sl)->sl_head)
#define SRPL_EMPTY_LOCKED(_sl) (SRPL_FIRST_LOCKED(_sl) == NULL)
#define SRPL_NEXT_LOCKED(_e, _ENTRY) \
srp_get_locked(&(_e)->_ENTRY.se_next)
#define SRPL_FOREACH_LOCKED(_c, _sl, _ENTRY) \
for ((_c) = SRPL_FIRST_LOCKED(_sl); \
(_c) != NULL; \
(_c) = SRPL_NEXT_LOCKED((_c), _ENTRY))
#define SRPL_FOREACH_SAFE_LOCKED(_c, _sl, _ENTRY, _tc) \
for ((_c) = SRPL_FIRST_LOCKED(_sl); \
(_c) && ((_tc) = SRPL_NEXT_LOCKED(_c, _ENTRY), 1); \
(_c) = (_tc))
#define SRPL_INSERT_HEAD_LOCKED(_rc, _sl, _e, _ENTRY) do { \
void *head; \
\
srp_init(&(_e)->_ENTRY.se_next); \
\
head = SRPL_FIRST_LOCKED(_sl); \
if (head != NULL) { \
(_rc)->srpl_ref(&(_rc)->srpl_cookie, head); \
srp_update_locked(&(_rc)->srpl_gc, \
&(_e)->_ENTRY.se_next, head); \
} \
\
(_rc)->srpl_ref(&(_rc)->srpl_cookie, _e); \
srp_update_locked(&(_rc)->srpl_gc, &(_sl)->sl_head, (_e)); \
} while (0)
#define SRPL_INSERT_AFTER_LOCKED(_rc, _se, _e, _ENTRY) do { \
void *next; \
\
srp_init(&(_e)->_ENTRY.se_next); \
\
next = SRPL_NEXT_LOCKED(_se, _ENTRY); \
if (next != NULL) { \
(_rc)->srpl_ref(&(_rc)->srpl_cookie, next); \
srp_update_locked(&(_rc)->srpl_gc, \
&(_e)->_ENTRY.se_next, next); \
} \
\
(_rc)->srpl_ref(&(_rc)->srpl_cookie, _e); \
srp_update_locked(&(_rc)->srpl_gc, \
&(_se)->_ENTRY.se_next, (_e)); \
} while (0)
#define SRPL_REMOVE_LOCKED(_rc, _sl, _e, _type, _ENTRY) do { \
struct srp *ref; \
struct _type *c, *n; \
\
ref = &(_sl)->sl_head; \
while ((c = srp_get_locked(ref)) != (_e)) \
ref = &c->_ENTRY.se_next; \
\
n = SRPL_NEXT_LOCKED(c, _ENTRY); \
if (n != NULL) \
(_rc)->srpl_ref(&(_rc)->srpl_cookie, n); \
srp_update_locked(&(_rc)->srpl_gc, ref, n); \
srp_update_locked(&(_rc)->srpl_gc, &c->_ENTRY.se_next, NULL); \
} while (0)
#endif /* _KERNEL */
#endif /* _SYS_SRP_H_ */
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