t_fpu.c revision 314817 
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
67static void recurse(void);
68
69int recursion_depth = 0;
70pthread_mutex_t recursion_depth_lock;
71
72static void *
73stir(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
87static double
88mul3(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
96static void *
97bar(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
118static void
119recurse(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
125ATF_TC(fpu);
126ATF_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}
132ATF_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
147ATF_TP_ADD_TCS(tp)
148{
149	ATF_TP_ADD_TC(tp, fpu);
150
151	return atf_no_error();
152}
153