1/* $NetBSD: t_fpu.c,v 1.2 2013/01/27 14:47:37 mbalmer 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 1.2 2013/01/27 14:47:37 mbalmer 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 <math.h>
53#include <pthread.h>
54#include <sched.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <unistd.h>
58
59#include <atf-c.h>
60
61#include "h_common.h"
62
63#define N_RECURSE 10
64
65static void recurse(void);
66
67int recursion_depth = 0;
68pthread_mutex_t recursion_depth_lock;
69
70static void *
71stir(void *p)
72{
73	double *q = (double *)p;
74	double x = *q++;
75	double y = *q++;
76	double z = *q++;
77
78	for (;;) {
79		x = sin ((y = cos (x + y + .4)) - (z = cos (x + z + .6)));
80		PTHREAD_REQUIRE(sched_yield());
81	}
82}
83
84static double
85mul3(double x, double y, double z)
86{
87	PTHREAD_REQUIRE(sched_yield());
88
89	return x * y * z;
90}
91
92static void *
93bar(void *p)
94{
95	double d;
96	int rc;
97
98	d = mul3(mul3(2., 3., 5.), mul3(7., 11., 13.), mul3(17., 19., 23.));
99	ATF_REQUIRE_EQ(d, 223092870.);
100
101	PTHREAD_REQUIRE(pthread_mutex_lock(&recursion_depth_lock));
102	rc = recursion_depth++;
103	PTHREAD_REQUIRE(pthread_mutex_unlock(&recursion_depth_lock));
104
105	if (rc < N_RECURSE)
106		recurse();
107	else
108		atf_tc_pass();
109
110	/* NOTREACHED */
111	return NULL;
112}
113
114static void
115recurse(void) {
116	pthread_t s2;
117	pthread_create(&s2, 0, bar, 0);
118	sleep(20); /* XXX must be long enough for our slowest machine */
119}
120
121ATF_TC(fpu);
122ATF_TC_HEAD(fpu, tc)
123{
124	atf_tc_set_md_var(tc, "descr",
125		"Checks that thread context switches will leave the "
126		"floating point computations unharmed");
127}
128ATF_TC_BODY(fpu, tc)
129{
130	double stirseed[] = { 1.7, 3.2, 2.4 };
131	pthread_t s5;
132
133	printf("Testing threaded floating point computations...\n");
134
135	PTHREAD_REQUIRE(pthread_mutex_init(&recursion_depth_lock, 0));
136
137	pthread_create(&s5, 0, stir, stirseed);
138	recurse();
139
140	atf_tc_fail("exiting from main");
141}
142
143ATF_TP_ADD_TCS(tp)
144{
145	ATF_TP_ADD_TC(tp, fpu);
146
147	return atf_no_error();
148}
149