nptl/tst-clock2.c

   1 /* Copyright (C) 2003-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <pthread.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <time.h>
  24 #include <unistd.h>
  25
  26
  27 #if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
  28 static pthread_barrier_t b2;
  29 static pthread_barrier_t bN;
  30
  31
  32 static void *
  33 tf (void *arg)
  34 {
  35   int e = pthread_barrier_wait (&b2);
  36   if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
  37     {
  38       puts ("barrier_wait failed");
  39       exit (1);
  40     }
  41
  42   e = pthread_barrier_wait (&bN);
  43   if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
  44     {
  45       puts ("barrier_wait failed");
  46       exit (1);
  47     }
  48
  49   return NULL;
  50 }
  51 #endif
  52
  53
  54 int
  55 do_test (void)
  56 {
  57 #if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
  58 # define N 10
  59
  60 # if _POSIX_THREAD_CPUTIME == 0
  61   if (sysconf (_SC_THREAD_CPUTIME) < 0)
  62     {
  63       puts ("_POSIX_THREAD_CPUTIME option not available");
  64       return 0;
  65     }
  66 # endif
  67
  68   if (pthread_barrier_init (&b2, NULL, 2) != 0
  69       || pthread_barrier_init (&bN, NULL, N + 1) != 0)
  70     {
  71       puts ("barrier_init failed");
  72       return 1;
  73     }
  74
  75   struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 };
  76   TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
  77
  78   pthread_t th[N + 1];
  79   clockid_t cl[N + 1];
  80 # ifndef CLOCK_THREAD_CPUTIME_ID
  81   if (pthread_getcpuclockid (pthread_self (), &cl[0]) != 0)
  82     {
  83       puts ("own pthread_getcpuclockid failed");
  84       return 1;
  85     }
  86 # else
  87   cl[0] = CLOCK_THREAD_CPUTIME_ID;
  88 # endif
  89
  90   pthread_attr_t at;
  91
  92   if (pthread_attr_init (&at) != 0)
  93     {
  94       puts ("attr_init failed");
  95       return 1;
  96     }
  97
  98   if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
  99     {
 100       puts ("attr_setstacksize failed");
 101       return 1;
 102     }
 103
 104   int i;
 105   int e;
 106   for (i = 0; i < N; ++i)
 107     {
 108       if (pthread_create (&th[i], &at, tf, NULL) != 0)
 109         {
 110           puts ("create failed");
 111           return 1;
 112         }
 113
 114       e = pthread_barrier_wait (&b2);
 115       if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
 116         {
 117           puts ("barrier_wait failed");
 118           return 1;
 119         }
 120
 121       ts.tv_sec = 0;
 122       ts.tv_nsec = 100000000;
 123       TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
 124
 125       if (pthread_getcpuclockid (th[i], &cl[i + 1]) != 0)
 126         {
 127           puts ("pthread_getcpuclockid failed");
 128           return 1;
 129         }
 130     }
 131
 132   if (pthread_attr_destroy (&at) != 0)
 133     {
 134       puts ("attr_destroy failed");
 135       return 1;
 136     }
 137
 138   struct timespec t[N + 1];
 139   for (i = 0; i < N + 1; ++i)
 140     if (clock_gettime (cl[i], &t[i]) != 0)
 141       {
 142         printf ("clock_gettime round %d failed\n", i);
 143         return 1;
 144       }
 145
 146   for (i = 0; i < N; ++i)
 147     {
 148       struct timespec diff;
 149
 150       diff.tv_sec = t[i].tv_sec - t[i + 1].tv_sec;
 151       diff.tv_nsec = t[i].tv_nsec - t[i + 1].tv_nsec;
 152       if (diff.tv_nsec < 0)
 153         {
 154           diff.tv_nsec += 1000000000;
 155           --diff.tv_sec;
 156         }
 157
 158       if (diff.tv_sec < 0 || (diff.tv_sec == 0 && diff.tv_nsec < 100000000))
 159         {
 160           printf ("\
 161 difference between thread %d and %d too small (%ld.%09ld)\n",
 162                   i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);
 163           return 1;
 164         }
 165
 166       printf ("diff %d->%d: %ld.%09ld\n",
 167               i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);
 168     }
 169
 170   ts.tv_sec = 0;
 171   ts.tv_nsec = 0;
 172   for (i = 0; i < N + 1; ++i)
 173     if (clock_settime (cl[i], &ts) != 0)
 174       {
 175         printf ("clock_settime(%d) round %d failed\n", cl[i], i);
 176         return 1;
 177       }
 178
 179   for (i = 0; i < N + 1; ++i)
 180     {
 181       if (clock_gettime (cl[i], &ts) != 0)
 182         {
 183           puts ("clock_gettime failed");
 184           return 1;
 185         }
 186
 187       if (ts.tv_sec > t[i].tv_sec
 188           || (ts.tv_sec == t[i].tv_sec && ts.tv_nsec > t[i].tv_nsec))
 189         {
 190           puts ("clock_settime didn't reset clock");
 191           return 1;
 192         }
 193     }
 194 #endif
 195
 196   return 0;
 197 }
 198
 199
 200 #define TEST_FUNCTION do_test ()
 201 #include "../test-skeleton.c"