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 rcu_ja_node_flag;
  31
  32 /*
  33  * Shadow node contains mutex and call_rcu head associated with a node.
  34  */
  35 struct rcu_ja_shadow_node {
  36         struct cds_lfht_node ht_node;   /* hash table node */
  37         struct rcu_ja_node *node;       /* reverse mapping and hash table key */
  38         pthread_mutex_t lock;           /* mutual exclusion on node */
  39         struct rcu_head head;           /* for deferred node and shadow node reclaim */
  40 };
  41
  42 struct rcu_ja {
  43         struct rcu_ja_node_flag *root;
  44         /*
  45          * We use a hash table to associate nodes to their respective
  46          * shadow node. This helps reducing lookup hot path cache
  47          * footprint, especially for very small nodes.
  48          */
  49         struct cds_lfht *ht;
  50 };
  51
  52 #endif /* _URCU_RCUJA_INTERNAL_H */