sysdeps/mips/tst-mode-switch-1.c

   1 /* Copyright (C) 2014-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <pthread.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <limits.h>
  25 #include <sys/prctl.h>
  26
  27 #if __mips_fpr != 0 || _MIPS_SPFPSET != 16
  28 # error This test requires -mfpxx -mno-odd-spreg
  29 #endif
  30
  31 /* This test verifies that mode changes do not clobber register state
  32    in other threads.  */
  33
  34 static volatile int finished;
  35 static int mode[6] =
  36   {
  37     0,
  38     PR_FP_MODE_FR,
  39     PR_FP_MODE_FR | PR_FP_MODE_FRE,
  40     PR_FP_MODE_FR,
  41     0,
  42     PR_FP_MODE_FR | PR_FP_MODE_FRE
  43   };
  44
  45 static void *
  46 thread_function (void * arg __attribute__ ((unused)))
  47 {
  48   volatile int i = 0;
  49   volatile float f = 0.0;
  50   volatile double d = 0.0;
  51
  52   while (!finished)
  53     {
  54       if ((float) i != f || (double) i != d)
  55         {
  56           printf ("unexpected value: i(%d) f(%f) d(%f)\n", i, f, d);
  57           exit (1);
  58         }
  59
  60       if (i == 100)
  61         {
  62           i = 0;
  63           f = 0.0;
  64           d = 0.0;
  65         }
  66
  67       i++;
  68       f++;
  69       d++;
  70     }
  71   return NULL;
  72 }
  73
  74 int
  75 main (void)
  76 {
  77   int count = sysconf (_SC_NPROCESSORS_ONLN);
  78   if (count <= 0)
  79     count = 1;
  80   count *= 4;
  81
  82   pthread_t th[count];
  83   int i;
  84   int result = 0;
  85
  86   for (i = 0; i < count; ++i)
  87     if (pthread_create (&th[i], NULL, thread_function, 0) != 0)
  88       {
  89         printf ("creation of thread %d failed\n", i);
  90         exit (1);
  91       }
  92
  93   for (i = 0 ; i < 1000000 ; i++)
  94     {
  95       if (prctl (PR_SET_FP_MODE, mode[i % 6]) != 0
  96           && errno != ENOTSUP)
  97         {
  98           printf ("prctl PR_SET_FP_MODE failed: %m\n");
  99           exit (1);
 100         }
 101     }
 102
 103   finished = 1;
 104
 105   for (i = 0; i < count; ++i)
 106     {
 107       void *v;
 108       if (pthread_join (th[i], &v) != 0)
 109         {
 110           printf ("join of thread %d failed\n", i);
 111           result = 1;
 112         }
 113       else if (v != NULL)
 114         {
 115           printf ("join %d successful, but child failed\n", i);
 116           result = 1;
 117         }
 118       else
 119         printf ("join %d successful\n", i);
 120     }
 121
 122   return result;
 123 }