1 /* $NetBSD: t_tree.c,v 1.1 2011/05/05 13:36:05 jruoho Exp $ */
2
3 /*-
4 * Copyright (c) 2010, 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #include <sys/tree.h>
31
32 #include <atf-c.h>
33 #include <stdlib.h>
34 #include <stdio.h>
35
36 struct mist {
37 RB_ENTRY(mist) rbentry;
38 int key;
39 };
40 RB_HEAD(head, mist) tt;
41
42 static int
mistcmp(struct mist * a,struct mist * b)43 mistcmp(struct mist *a, struct mist *b)
44 {
45 #if 0
46 return (b->key - a->key); /* wrong, can overflow */
47 #else
48 if (b->key > a->key)
49 return 1;
50 else if (b->key < a->key)
51 return (-1);
52 else
53 return 0;
54 #endif
55 }
56
RB_PROTOTYPE(head,mist,rbentry,mistcmp)57 RB_PROTOTYPE(head, mist, rbentry, mistcmp)
58 RB_GENERATE(head, mist, rbentry, mistcmp)
59
60 static struct mist *
61 addmist(int key)
62 {
63 struct mist *m;
64
65 m = malloc(sizeof(struct mist));
66 m->key = key;
67 RB_INSERT(head, &tt, m);
68 return m;
69 }
70
71 static int
findmist(struct mist * m)72 findmist(struct mist *m)
73 {
74
75 return (!!RB_FIND(head, &tt, m));
76 }
77
78 #define N 1000
79 static int
test(void)80 test(void)
81 {
82 struct mist *m[N];
83 int fail, i, j;
84
85 RB_INIT(&tt);
86 fail = 0;
87 for (i = 0; i < N; i++) {
88 m[i] = addmist(random() << 1); /* use all 32 bits */
89 for (j = 0; j <= i; j++)
90 if (!findmist(m[j]))
91 fail++;
92 }
93 return fail;
94 }
95
96 ATF_TC(tree_rbstress);
ATF_TC_HEAD(tree_rbstress,tc)97 ATF_TC_HEAD(tree_rbstress, tc)
98 {
99
100 atf_tc_set_md_var(tc, "descr", "rb-tree stress test");
101 }
102
ATF_TC_BODY(tree_rbstress,tc)103 ATF_TC_BODY(tree_rbstress, tc)
104 {
105 int i, fail, f;
106
107 srandom(4711);
108 fail = 0;
109 for (i = 0; i < 10; i++) {
110 f = test();
111 if (f) {
112 atf_tc_fail_nonfatal("loop %d: %d errors\n", i, f);
113 fail += f;
114 }
115 }
116 }
117
ATF_TP_ADD_TCS(tp)118 ATF_TP_ADD_TCS(tp)
119 {
120
121 ATF_TP_ADD_TC(tp, tree_rbstress);
122
123 return atf_no_error();
124 }
125