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 <stdio.h>
  28 #include <inttypes.h>
  29 #include <urcu/rculfhash.h>
  30
  31 /* Never declared. Opaque type used to store flagged node pointers. */
  32 struct cds_ja_inode_flag;
  33
  34 /*
  35  * Shadow node contains mutex and call_rcu head associated with a node.
  36  */
  37 struct cds_ja_shadow_node {
  38         struct cds_lfht_node ht_node;   /* hash table node */
  39         struct cds_ja_inode *node;      /* reverse mapping and hash table key */
  40         /*
  41          * mutual exclusion on all nodes belonging to the same tree
  42          * position (e.g. both nodes before and after recompaction
  43          * use the same lock).
  44          */
  45         pthread_mutex_t *lock;
  46         unsigned int nr_child;          /* number of children in node */
  47         struct rcu_head head;           /* for deferred node and shadow node reclaim */
  48         int is_root;                    /* is it a root node ? */
  49         int fallback_removal_count;     /* removals left keeping fallback */
  50 };
  51
  52 struct cds_ja {
  53         struct cds_ja_inode_flag *root;
  54         unsigned int tree_depth;
  55         uint64_t key_max;
  56         /*
  57          * We use a hash table to associate node keys to their
  58          * respective shadow node. This helps reducing lookup hot path
  59          * cache footprint, especially for very small nodes.
  60          */
  61         struct cds_lfht *ht;
  62         unsigned long nr_fallback;      /* Number of fallback nodes used */
  63 };
  64
  65 __attribute__((visibility("protected")))
  66 struct cds_ja_shadow_node *rcuja_shadow_lookup_lock(struct cds_lfht *ht,
  67                 struct cds_ja_inode *node);
  68
  69 __attribute__((visibility("protected")))
  70 void rcuja_shadow_unlock(struct cds_ja_shadow_node *shadow_node);
  71
  72 __attribute__((visibility("protected")))
  73 struct cds_ja_shadow_node *rcuja_shadow_set(struct cds_lfht *ht,
  74                 struct cds_ja_inode *new_node,
  75                 struct cds_ja_shadow_node *inherit_from);
  76
  77 /* rcuja_shadow_clear flags */
  78 enum {
  79         RCUJA_SHADOW_CLEAR_FREE_NODE = (1U << 0),
  80         RCUJA_SHADOW_CLEAR_FREE_LOCK = (1U << 1),
  81 };
  82
  83 __attribute__((visibility("protected")))
  84 int rcuja_shadow_clear(struct cds_lfht *ht,
  85                 struct cds_ja_inode *node,
  86                 struct cds_ja_shadow_node *shadow_node,
  87                 unsigned int flags);
  88
  89 __attribute__((visibility("protected")))
  90 void rcuja_shadow_prune(struct cds_lfht *ht,
  91                 unsigned int flags);
  92
  93 __attribute__((visibility("protected")))
  94 struct cds_lfht *rcuja_create_ht(const struct rcu_flavor_struct *flavor);
  95
  96 __attribute__((visibility("protected")))
  97 int rcuja_delete_ht(struct cds_lfht *ht);
  98
  99 #define DEBUG
 100
 101 #ifdef DEBUG
 102 #define dbg_printf(fmt, args...)     printf("[debug rcuja] " fmt, ## args)
 103 #else
 104 #define dbg_printf(fmt, args...)                                \
 105 do {                                                            \
 106         /* do nothing but check printf format */                \
 107         if (0)                                                  \
 108                 printf("[debug rcuja] " fmt, ## args);  \
 109 } while (0)
 110 #endif
 111
 112 #endif /* _URCU_RCUJA_INTERNAL_H */