1 /* $NetBSD: t_fpu.c,v 1.3 2017/01/16 16:27:43 christos Exp $ */
2
3 /*
4 * Copyright (c) 2008 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 __COPYRIGHT("@(#) Copyright (c) 2008\
31 The NetBSD Foundation, inc. All rights reserved.");
32 __RCSID("$NetBSD: t_fpu.c,v 1.3 2017/01/16 16:27:43 christos Exp $");
33
34 /*
35 * This is adapted from part of csw/cstest of the MPD implementation by
36 * the University of Arizona CS department (http://www.cs.arizona.edu/sr/)
37 * which is in the public domain:
38 *
39 * "The MPD system is in the public domain and you may use and distribute it
40 * as you wish. We ask that you retain credits referencing the University
41 * of Arizona and that you identify any changes you make.
42 *
43 * We can't provide a warranty with MPD; it's up to you to determine its
44 * suitability and reliability for your needs. We would like to hear of
45 * any problems you encounter but we cannot promise a timely correction."
46 *
47 * It was changed to use pthread_create() and sched_yield() instead of
48 * the internal MPD context switching primitives by Ignatios Souvatzis
49 * <is@netbsd.org>.
50 */
51
52 #include <errno.h>
53 #include <math.h>
54 #include <pthread.h>
55 #include <sched.h>
56 #include <stdio.h>
57 #include <string.h>
58 #include <stdlib.h>
59 #include <unistd.h>
60
61 #include <atf-c.h>
62
63 #include "h_common.h"
64
65 #define N_RECURSE 10
66
67 static void recurse(void);
68
69 int recursion_depth = 0;
70 pthread_mutex_t recursion_depth_lock;
71
72 static void *
stir(void * p)73 stir(void *p)
74 {
75 double *q = (double *)p;
76 double x = *q++;
77 double y = *q++;
78 double z = *q++;
79
80 for (;;) {
81 x = sin ((y = cos (x + y + .4)) - (z = cos (x + z + .6)));
82 ATF_REQUIRE_MSG(sched_yield() == 0,
83 "sched_yield failed: %s", strerror(errno));
84 }
85 }
86
87 static double
mul3(double x,double y,double z)88 mul3(double x, double y, double z)
89 {
90 ATF_REQUIRE_MSG(sched_yield() == 0,
91 "sched_yield failed: %s", strerror(errno));
92
93 return x * y * z;
94 }
95
96 static void *
bar(void * p)97 bar(void *p)
98 {
99 double d;
100 int rc;
101
102 d = mul3(mul3(2., 3., 5.), mul3(7., 11., 13.), mul3(17., 19., 23.));
103 ATF_REQUIRE_EQ(d, 223092870.);
104
105 PTHREAD_REQUIRE(pthread_mutex_lock(&recursion_depth_lock));
106 rc = recursion_depth++;
107 PTHREAD_REQUIRE(pthread_mutex_unlock(&recursion_depth_lock));
108
109 if (rc < N_RECURSE)
110 recurse();
111 else
112 atf_tc_pass();
113
114 /* NOTREACHED */
115 return NULL;
116 }
117
118 static void
recurse(void)119 recurse(void) {
120 pthread_t s2;
121 PTHREAD_REQUIRE(pthread_create(&s2, 0, bar, 0));
122 sleep(20); /* XXX must be long enough for our slowest machine */
123 }
124
125 ATF_TC(fpu);
ATF_TC_HEAD(fpu,tc)126 ATF_TC_HEAD(fpu, tc)
127 {
128 atf_tc_set_md_var(tc, "descr",
129 "Checks that thread context switches will leave the "
130 "floating point computations unharmed");
131 }
ATF_TC_BODY(fpu,tc)132 ATF_TC_BODY(fpu, tc)
133 {
134 double stirseed[] = { 1.7, 3.2, 2.4 };
135 pthread_t s5;
136
137 printf("Testing threaded floating point computations...\n");
138
139 PTHREAD_REQUIRE(pthread_mutex_init(&recursion_depth_lock, 0));
140
141 PTHREAD_REQUIRE(pthread_create(&s5, 0, stir, stirseed));
142 recurse();
143
144 atf_tc_fail("exiting from main");
145 }
146
ATF_TP_ADD_TCS(tp)147 ATF_TP_ADD_TCS(tp)
148 {
149 ATF_TP_ADD_TC(tp, fpu);
150
151 return atf_no_error();
152 }
153