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