tests/lib/libpthread/t_fpu.c

   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
  65 static void recurse(void);
  66
  67 int recursion_depth = 0;
  68 pthread_mutex_t recursion_depth_lock;
  69
  70 static void *
  71 stir(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
  84 static double
  85 mul3(double x, double y, double z)
  86 {
  87         PTHREAD_REQUIRE(sched_yield());
  88
  89         return x * y * z;
  90 }
  91
  92 static void *
  93 bar(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
 114 static void
 115 recurse(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
 121 ATF_TC(fpu);
 122 ATF_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 }
 128 ATF_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
 143 ATF_TP_ADD_TCS(tp)
 144 {
 145         ATF_TP_ADD_TC(tp, fpu);
 146
 147         return atf_no_error();
 148 }