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lib/lib9p/hashtable.h
- This file was added.
/* | |||||
* 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 */ |