sysdeps/mips/tst-mode-switch-2.c

   1 /* Copyright (C) 2014-2024 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23 #include <limits.h>
  24 #include <pthread.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 all threads in a process see a mode
  32    change when any thread causes a mode change.  */
  33
  34 static int mode[6] =
  35   {
  36     0,
  37     PR_FP_MODE_FR,
  38     PR_FP_MODE_FR | PR_FP_MODE_FRE,
  39     PR_FP_MODE_FR,
  40     0,
  41     PR_FP_MODE_FR | PR_FP_MODE_FRE
  42   };
  43 static volatile int current_mode;
  44 static volatile int finished;
  45 static pthread_barrier_t barr_ready;
  46 static pthread_barrier_t barr_cont;
  47
  48 static void *
  49 thread_function (void * arg __attribute__ ((unused)))
  50 {
  51   while (!finished)
  52     {
  53       int res = pthread_barrier_wait (&barr_ready);
  54
  55       if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
  56         {
  57           printf ("barrier wait failed: %m\n");
  58           exit (1);
  59         }
  60
  61       int mode = prctl (PR_GET_FP_MODE);
  62
  63       if (mode != current_mode)
  64         {
  65           printf ("unexpected mode: %d != %d\n", mode, current_mode);
  66           exit (1);
  67         }
  68
  69       res = pthread_barrier_wait (&barr_cont);
  70
  71       if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
  72         {
  73           printf ("barrier wait failed: %m\n");
  74           exit (1);
  75         }
  76     }
  77   return NULL;
  78 }
  79
  80 static int
  81 do_test (void)
  82 {
  83   int count = sysconf (_SC_NPROCESSORS_ONLN);
  84   if (count <= 0)
  85     count = 1;
  86   count *= 4;
  87
  88   pthread_t th[count];
  89   int i;
  90   int result = 0;
  91
  92   if (pthread_barrier_init (&barr_ready, NULL, count + 1) != 0)
  93     {
  94       printf ("failed to initialize barrier: %m\n");
  95       exit (1);
  96     }
  97
  98   if (pthread_barrier_init (&barr_cont, NULL, count + 1) != 0)
  99     {
 100       printf ("failed to initialize barrier: %m\n");
 101       exit (1);
 102     }
 103
 104   for (i = 0; i < count; ++i)
 105     if (pthread_create (&th[i], NULL, thread_function, 0) != 0)
 106       {
 107         printf ("creation of thread %d failed\n", i);
 108         exit (1);
 109       }
 110
 111   for (i = 0 ; i < 7 ; i++)
 112     {
 113       if (prctl (PR_SET_FP_MODE, mode[i % 6]) != 0)
 114         {
 115           if (errno != ENOTSUP)
 116             {
 117               printf ("prctl PR_SET_FP_MODE failed: %m");
 118               exit (1);
 119             }
 120         }
 121       else
 122         current_mode = mode[i % 6];
 123
 124
 125       int res = pthread_barrier_wait (&barr_ready);
 126
 127       if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
 128         {
 129           printf ("barrier wait failed: %m\n");
 130           exit (1);
 131         }
 132
 133       if (i == 6)
 134         finished = 1;
 135
 136       res = pthread_barrier_wait (&barr_cont);
 137
 138       if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
 139         {
 140           printf ("barrier wait failed: %m\n");
 141           exit (1);
 142         }
 143     }
 144
 145   for (i = 0; i < count; ++i)
 146     {
 147       void *v;
 148       if (pthread_join (th[i], &v) != 0)
 149         {
 150           printf ("join of thread %d failed\n", i);
 151           result = 1;
 152         }
 153       else if (v != NULL)
 154         {
 155           printf ("join %d successful, but child failed\n", i);
 156           result = 1;
 157         }
 158       else
 159         printf ("join %d successful\n", i);
 160     }
 161
 162   return result;
 163 }
 164
 165 #define TEST_FUNCTION do_test ()
 166 #include "../../test-skeleton.c"