rcuja/rcuja-internal.h

   1 #ifndef _URCU_RCUJA_INTERNAL_H
   2 #define _URCU_RCUJA_INTERNAL_H
   3
   4 /*
   5  * rcuja/rcuja-internal.h
   6  *
   7  * Userspace RCU library - RCU Judy Array Internal Header
   8  *
   9  * Copyright 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; either
  14  * version 2.1 of the License, or (at your option) any later version.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  24  */
  25
  26 #include <pthread.h>
  27 #include <urcu/rculfhash.h>
  28
  29 /* Never declared. Opaque type used to store flagged node pointers. */
  30 struct cds_ja_node_flag;
  31
  32 /*
  33  * Shadow node contains mutex and call_rcu head associated with a node.
  34  */
  35 struct cds_ja_shadow_node {
  36         struct cds_lfht_node ht_node;   /* hash table node */
  37         struct cds_ja_node *node;       /* reverse mapping and hash table key */
  38         /*
  39          * mutual exclusion on all nodes belonging to the same tree
  40          * position (e.g. both nodes before and after recompaction
  41          * use the same lock).
  42          */
  43         pthread_mutex_t *lock;
  44         unsigned int nr_child;          /* number of children in node */
  45         struct rcu_head head;           /* for deferred node and shadow node reclaim */
  46 };
  47
  48 struct cds_ja {
  49         struct cds_ja_node_flag *root;
  50         /*
  51          * We use a hash table to associate node keys to their
  52          * respective shadow node. This helps reducing lookup hot path
  53          * cache footprint, especially for very small nodes.
  54          */
  55         struct cds_lfht *ht;
  56 };
  57
  58 __attribute__((visibility("protected")))
  59 struct cds_ja_shadow_node *rcuja_shadow_lookup_lock(struct cds_lfht *ht,
  60                 struct cds_ja_node *node);
  61 __attribute__((visibility("protected")))
  62 void rcuja_shadow_unlock(struct cds_ja_shadow_node *shadow_node);
  63 __attribute__((visibility("protected")))
  64 int rcuja_shadow_set(struct cds_lfht *ht,
  65                 struct cds_ja_node *new_node,
  66                 struct cds_ja_shadow_node *inherit_from);
  67 __attribute__((visibility("protected")))
  68
  69 /* rcuja_shadow_clear flags */
  70 enum {
  71         RCUJA_SHADOW_CLEAR_FREE_NODE = (1U << 0),
  72         RCUJA_SHADOW_CLEAR_FREE_LOCK = (1U << 1),
  73 };
  74
  75 int rcuja_shadow_clear(struct cds_lfht *ht,
  76                 struct cds_ja_node *node,
  77                 unsigned int flags);
  78 __attribute__((visibility("protected")))
  79 struct cds_lfht *rcuja_create_ht(const struct rcu_flavor_struct *flavor);
  80 __attribute__((visibility("protected")))
  81 void rcuja_delete_ht(struct cds_lfht *ht);
  82
  83 #endif /* _URCU_RCUJA_INTERNAL_H */