move memory management code out as rculfhash-mm-order.c
[urcu.git] / rculfhash-internal.h
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1#ifndef _URCU_RCULFHASH_INTERNAL_H
2#define _URCU_RCULFHASH_INTERNAL_H
3
4/*
5 * urcu/rculfhash-internal.h
6 *
7 * Internal header for Lock-Free RCU Hash Table
8 *
9 * Copyright 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 * Copyright 2011 - Lai Jiangshan <laijs@cn.fujitsu.com>
11 *
12 * This library is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
16 *
17 * This library is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
21 *
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with this library; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 */
26
27#include <urcu/rculfhash.h>
28
29#ifdef DEBUG
30#define dbg_printf(fmt, args...) printf("[debug rculfhash] " fmt, ## args)
31#else
32#define dbg_printf(fmt, args...)
33#endif
34
35#if (CAA_BITS_PER_LONG == 32)
36#define MAX_TABLE_ORDER 32
37#else
38#define MAX_TABLE_ORDER 64
39#endif
40
41#ifndef min
42#define min(a, b) ((a) < (b) ? (a) : (b))
43#endif
44
45#ifndef max
46#define max(a, b) ((a) > (b) ? (a) : (b))
47#endif
48
49struct ht_items_count;
50
51/*
52 * cds_lfht: Top-level data structure representing a lock-free hash
53 * table. Defined in the implementation file to make it be an opaque
54 * cookie to users.
55 */
56struct cds_lfht {
57 unsigned long size; /* always a power of 2, shared (RCU) */
58 int flags;
59
60 /*
61 * We need to put the work threads offline (QSBR) when taking this
62 * mutex, because we use synchronize_rcu within this mutex critical
63 * section, which waits on read-side critical sections, and could
64 * therefore cause grace-period deadlock if we hold off RCU G.P.
65 * completion.
66 */
67 pthread_mutex_t resize_mutex; /* resize mutex: add/del mutex */
68 pthread_attr_t *resize_attr; /* Resize threads attributes */
69 unsigned int in_progress_resize, in_progress_destroy;
70 unsigned long resize_target;
71 int resize_initiated;
72 const struct rcu_flavor_struct *flavor;
73
74 long count; /* global approximate item count */
75 struct ht_items_count *split_count; /* split item count */
76
77 /* memory management related fields are located at the end */
78 const struct cds_lfht_mm_type *mm;
79
80 unsigned long min_alloc_buckets_order;
81 unsigned long min_nr_alloc_buckets;
82 unsigned long max_nr_buckets;
83
84 struct cds_lfht_node *(*bucket_at)(struct cds_lfht *ht,
85 unsigned long index);
86
87 union {
88 /*
89 * Contains the per order-index-level bucket node table.
90 * The size of each bucket node table is half the number
91 * of hashes contained in this order (except for order 0).
92 * The minimum allocation buckets size parameter allows
93 * combining the bucket node arrays of the lowermost
94 * levels to improve cache locality for small index orders.
95 */
96 struct cds_lfht_node *tbl_order[MAX_TABLE_ORDER];
97 };
98};
99
100extern unsigned int fls_ulong(unsigned long x);
101extern int get_count_order_ulong(unsigned long x);
102
103#ifdef POISON_FREE
104#define poison_free(ptr) \
105 do { \
106 if (ptr) { \
107 memset(ptr, 0x42, sizeof(*(ptr))); \
108 free(ptr); \
109 } \
110 } while (0)
111#else
112#define poison_free(ptr) free(ptr)
113#endif
114
115#endif /* _URCU_RCULFHASH_INTERNAL_H */
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