1122531Sume/* 2122531Sume * Copyright 2016 Jakub Klama <jceel@FreeBSD.org> 3122531Sume * All rights reserved 4122531Sume * 5122531Sume * Redistribution and use in source and binary forms, with or without 6122531Sume * modification, are permitted providing that the following conditions 7122531Sume * are met: 8122531Sume * 1. Redistributions of source code must retain the above copyright 9122531Sume * notice, this list of conditions and the following disclaimer. 10122531Sume * 2. Redistributions in binary form must reproduce the above copyright 11122531Sume * notice, this list of conditions and the following disclaimer in the 12122531Sume * documentation and/or other materials provided with the distribution. 13122531Sume * 14122531Sume * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15122531Sume * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16122531Sume * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17122531Sume * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 18122531Sume * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19122531Sume * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20122531Sume * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21122531Sume * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 22122531Sume * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 23122531Sume * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 24122531Sume * POSSIBILITY OF SUCH DAMAGE. 25122531Sume * 26122531Sume */ 27122531Sume 28122531Sume#ifndef LIB9P_HASHTABLE_H 29122531Sume#define LIB9P_HASHTABLE_H 30122531Sume 31122531Sume#include <pthread.h> 32122531Sume#include <sys/queue.h> 33175360Ssobomax 34122531Sumestruct ht { 35175360Ssobomax struct ht_entry * ht_entries; 36122531Sume ssize_t ht_nentries; 37122531Sume pthread_rwlock_t ht_rwlock; 38122531Sume}; 39122531Sume 40122531Sumestruct ht_entry { 41122531Sume TAILQ_HEAD(, ht_item) hte_items; 42122531Sume}; 43122531Sume 44122531Sumestruct ht_item { 45122531Sume uint32_t hti_hash; 46122531Sume void * hti_data; 47122531Sume TAILQ_ENTRY(ht_item) hti_link; 48122531Sume}; 49122531Sume 50122531Sumestruct ht_iter { 51122531Sume struct ht * htit_parent; 52122531Sume struct ht_item * htit_curr; 53122531Sume struct ht_item * htit_next; 54122531Sume ssize_t htit_slot; 55122531Sume}; 56122531Sume 57122531Sume#ifdef __clang__ 58122531Sume#pragma clang diagnostic push 59122531Sume#pragma clang diagnostic ignored "-Wthread-safety-analysis" 60#endif 61 62/* 63 * Obtain read-lock on hash table. 64 */ 65static inline int 66ht_rdlock(struct ht *h) 67{ 68 69 return (pthread_rwlock_rdlock(&h->ht_rwlock)); 70} 71 72/* 73 * Obtain write-lock on hash table. 74 */ 75static inline int 76ht_wrlock(struct ht *h) 77{ 78 79 return (pthread_rwlock_wrlock(&h->ht_rwlock)); 80} 81 82/* 83 * Release lock on hash table. 84 */ 85static inline int 86ht_unlock(struct ht *h) 87{ 88 89 return (pthread_rwlock_unlock(&h->ht_rwlock)); 90} 91 92#ifdef __clang__ 93#pragma clang diagnostic pop 94#endif 95 96void ht_init(struct ht *h, ssize_t size); 97void ht_destroy(struct ht *h); 98void *ht_find(struct ht *h, uint32_t hash); 99void *ht_find_locked(struct ht *h, uint32_t hash); 100int ht_add(struct ht *h, uint32_t hash, void *value); 101int ht_remove(struct ht *h, uint32_t hash); 102int ht_remove_locked(struct ht *h, uint32_t hash); 103int ht_remove_at_iter(struct ht_iter *iter); 104void ht_iter(struct ht *h, struct ht_iter *iter); 105void *ht_next(struct ht_iter *iter); 106 107#endif /* LIB9P_HASHTABLE_H */ 108