t_fpu.c revision 312038
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#ifdef __FreeBSD__ 62#include <errno.h> 63#include <string.h> 64#endif 65 66#include "h_common.h" 67 68#define N_RECURSE 10 69 70static void recurse(void); 71 72int recursion_depth = 0; 73pthread_mutex_t recursion_depth_lock; 74 75static void * 76stir(void *p) 77{ 78 double *q = (double *)p; 79 double x = *q++; 80 double y = *q++; 81 double z = *q++; 82 83 for (;;) { 84 x = sin ((y = cos (x + y + .4)) - (z = cos (x + z + .6))); 85#ifdef __FreeBSD__ 86 ATF_REQUIRE_MSG(sched_yield() == 0, 87 "sched_yield failed: %s", strerror(errno)); 88#else 89 PTHREAD_REQUIRE(sched_yield()); 90#endif 91 } 92} 93 94static double 95mul3(double x, double y, double z) 96{ 97#ifdef __FreeBSD__ 98 ATF_REQUIRE_MSG(sched_yield() == 0, 99 "sched_yield failed: %s", strerror(errno)); 100#else 101 PTHREAD_REQUIRE(sched_yield()); 102#endif 103 104 return x * y * z; 105} 106 107static void * 108bar(void *p) 109{ 110 double d; 111 int rc; 112 113 d = mul3(mul3(2., 3., 5.), mul3(7., 11., 13.), mul3(17., 19., 23.)); 114 ATF_REQUIRE_EQ(d, 223092870.); 115 116 PTHREAD_REQUIRE(pthread_mutex_lock(&recursion_depth_lock)); 117 rc = recursion_depth++; 118 PTHREAD_REQUIRE(pthread_mutex_unlock(&recursion_depth_lock)); 119 120 if (rc < N_RECURSE) 121 recurse(); 122 else 123 atf_tc_pass(); 124 125 /* NOTREACHED */ 126 return NULL; 127} 128 129static void 130recurse(void) { 131 pthread_t s2; 132#ifdef __FreeBSD__ 133 PTHREAD_REQUIRE(pthread_create(&s2, 0, bar, 0)); 134#else 135 pthread_create(&s2, 0, bar, 0); 136#endif 137 sleep(20); /* XXX must be long enough for our slowest machine */ 138} 139 140ATF_TC(fpu); 141ATF_TC_HEAD(fpu, tc) 142{ 143 atf_tc_set_md_var(tc, "descr", 144 "Checks that thread context switches will leave the " 145 "floating point computations unharmed"); 146} 147ATF_TC_BODY(fpu, tc) 148{ 149 double stirseed[] = { 1.7, 3.2, 2.4 }; 150 pthread_t s5; 151 152 printf("Testing threaded floating point computations...\n"); 153 154 PTHREAD_REQUIRE(pthread_mutex_init(&recursion_depth_lock, 0)); 155 156#ifdef __FreeBSD__ 157 PTHREAD_REQUIRE(pthread_create(&s5, 0, stir, stirseed)); 158#else 159 pthread_create(&s5, 0, stir, stirseed); 160#endif 161 recurse(); 162 163 atf_tc_fail("exiting from main"); 164} 165 166ATF_TP_ADD_TCS(tp) 167{ 168 ATF_TP_ADD_TC(tp, fpu); 169 170 return atf_no_error(); 171} 172