X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=urcu%2Frculfhash.h;h=9934422ee9d6e1a4e737da18c73ba14c54dbbff7;hb=HEAD;hp=8ee9bdd9ebd9eb368e139b26a3ab51d167d8ea99;hpb=f0c29ed7ca7129056f5c757a9fbcbbfa8c14da44;p=userspace-rcu.git diff --git a/urcu/rculfhash.h b/urcu/rculfhash.h deleted file mode 100644 index 8ee9bdd..0000000 --- a/urcu/rculfhash.h +++ /dev/null @@ -1,157 +0,0 @@ -#ifndef _URCU_RCULFHASH_H -#define _URCU_RCULFHASH_H - -/* - * urcu/rculfhash.h - * - * Userspace RCU library - Lock-Free RCU Hash Table - * - * Copyright 2011 - Mathieu Desnoyers - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include -#include - -#ifdef __cplusplus -extern "C" { -#endif - -/* - * struct rcu_ht_node and struct _rcu_ht_node should be aligned on - * 4-bytes boundaries because the two lower bits are used as flags. - */ - -struct _rcu_ht_node { - struct rcu_ht_node *next; /* ptr | DUMMY_FLAG | REMOVED_FLAG */ - unsigned long reverse_hash; -}; - -struct rcu_ht_node { - /* cache-hot for iteration */ - struct _rcu_ht_node p; /* needs to be first field */ - void *key; - unsigned int key_len; - /* cache-cold for iteration */ - struct rcu_head head; -}; - -struct rcu_ht; - -/* - * Caution ! - * Ensure reader and writer threads are registered as urcu readers. - */ - -typedef unsigned long (*ht_hash_fct)(void *key, size_t length, - unsigned long seed); -typedef unsigned long (*ht_compare_fct)(void *key1, size_t key1_len, - void *key2, size_t key2_len); - -/* - * ht_node_init - initialize a hash table node - */ -static inline -void ht_node_init(struct rcu_ht_node *node, void *key, - size_t key_len) -{ - node->key = key; - node->key_len = key_len; -} - -/* - * ht_new - allocate a hash table. - * - * init_size must be power of two. - */ -struct rcu_ht *ht_new(ht_hash_fct hash_fct, - ht_compare_fct compare_fct, - unsigned long hash_seed, - unsigned long init_size, - void (*ht_call_rcu)(struct rcu_head *head, - void (*func)(struct rcu_head *head))); - -/* - * ht_destroy - destroy a hash table. - */ -int ht_destroy(struct rcu_ht *ht); - -/* - * ht_count_nodes - count the number of nodes in the hash table. - * - * Call with rcu_read_lock held. - */ -void ht_count_nodes(struct rcu_ht *ht, - unsigned long *count, - unsigned long *removed); - -/* - * ht_lookup - lookup a node by key. - * - * Returns NULL if not found. - * Call with rcu_read_lock held. - */ -struct rcu_ht_node *ht_lookup(struct rcu_ht *ht, void *key, size_t key_len); - -/* - * ht_next - get the next item with same key (after a lookup). - * - * Returns NULL if no following node exists with same key. - * RCU read-side lock must be held across ht_lookup and ht_next calls, and also - * between ht_next calls using the node returned by a previous ht_next. - * Call with rcu_read_lock held. - */ -struct rcu_ht_node *ht_next(struct rcu_ht *ht, struct rcu_ht_node *node); - -/* - * ht_add - add a node to the hash table. - * - * Call with rcu_read_lock held. - */ -void ht_add(struct rcu_ht *ht, struct rcu_ht_node *node); - -/* - * ht_add_unique - add a node to hash table, if key is not present. - * - * Returns the node added upon success. - * Returns the unique node already present upon failure. If ht_add_unique fails, - * the node passed as parameter should be freed by the caller. - * Call with rcu_read_lock held. - */ -struct rcu_ht_node *ht_add_unique(struct rcu_ht *ht, struct rcu_ht_node *node); - -/* - * ht_remove - remove node from hash table. - * - * Node can be looked up with ht_lookup. RCU read-side lock must be held between - * lookup and removal. - * Call with rcu_read_lock held. - */ -int ht_remove(struct rcu_ht *ht, struct rcu_ht_node *node); - -/* - * ht_resize - Force a hash table resize - * @growth: growth order (current size is multiplied by 2^growth) - * - * Currently, only expand operation is supported (growth >= 0). - */ -void ht_resize(struct rcu_ht *ht, int growth); - -#ifdef __cplusplus -} -#endif - -#endif /* _URCU_RCULFHASH_H */