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/*
* Copyright 2016 Jakub Klama <jceel@FreeBSD.org>
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted providing 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 ``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 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.
*
*/
#ifndef LIB9P_HASHTABLE_H
#define LIB9P_HASHTABLE_H
#include <pthread.h>
#include <sys/queue.h>
struct ht {
struct ht_entry * ht_entries;
ssize_t ht_nentries;
pthread_rwlock_t ht_rwlock;
};
struct ht_entry {
TAILQ_HEAD(, ht_item) hte_items;
};
struct ht_item {
uint32_t hti_hash;
void * hti_data;
TAILQ_ENTRY(ht_item) hti_link;
};
struct ht_iter {
struct ht * htit_parent;
struct ht_item * htit_curr;
struct ht_item * htit_next;
ssize_t htit_slot;
};
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wthread-safety-analysis"
#endif
/*
* Obtain read-lock on hash table.
*/
static inline int
ht_rdlock(struct ht *h)
{
return (pthread_rwlock_rdlock(&h->ht_rwlock));
}
/*
* Obtain write-lock on hash table.
*/
static inline int
ht_wrlock(struct ht *h)
{
return (pthread_rwlock_wrlock(&h->ht_rwlock));
}
/*
* Release lock on hash table.
*/
static inline int
ht_unlock(struct ht *h)
{
return (pthread_rwlock_unlock(&h->ht_rwlock));
}
#ifdef __clang__
#pragma clang diagnostic pop
#endif
void ht_init(struct ht *h, ssize_t size);
void ht_destroy(struct ht *h);
void *ht_find(struct ht *h, uint32_t hash);
void *ht_find_locked(struct ht *h, uint32_t hash);
int ht_add(struct ht *h, uint32_t hash, void *value);
int ht_remove(struct ht *h, uint32_t hash);
int ht_remove_locked(struct ht *h, uint32_t hash);
int ht_remove_at_iter(struct ht_iter *iter);
void ht_iter(struct ht *h, struct ht_iter *iter);
void *ht_next(struct ht_iter *iter);
#endif /* LIB9P_HASHTABLE_H */
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