nptl/tst-clock2.c

   1 /* Copyright (C) 2003-2021 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 <pthread.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <time.h>
  23 #include <unistd.h>
  24
  25
  26 #if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
  27 static pthread_barrier_t b2;
  28 static pthread_barrier_t bN;
  29
  30
  31 static void *
  32 tf (void *arg)
  33 {
  34   int e = pthread_barrier_wait (&b2);
  35   if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
  36     {
  37       puts ("barrier_wait failed");
  38       exit (1);
  39     }
  40
  41   e = pthread_barrier_wait (&bN);
  42   if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
  43     {
  44       puts ("barrier_wait failed");
  45       exit (1);
  46     }
  47
  48   return NULL;
  49 }
  50 #endif
  51
  52
  53 int
  54 do_test (void)
  55 {
  56 #if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
  57 # define N 10
  58
  59 # if _POSIX_THREAD_CPUTIME == 0
  60   if (sysconf (_SC_THREAD_CPUTIME) < 0)
  61     {
  62       puts ("_POSIX_THREAD_CPUTIME option not available");
  63       return 0;
  64     }
  65 # endif
  66
  67   if (pthread_barrier_init (&b2, NULL, 2) != 0
  68       || pthread_barrier_init (&bN, NULL, N + 1) != 0)
  69     {
  70       puts ("barrier_init failed");
  71       return 1;
  72     }
  73
  74   struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 };
  75   TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
  76
  77   pthread_t th[N + 1];
  78   clockid_t cl[N + 1];
  79 # ifndef CLOCK_THREAD_CPUTIME_ID
  80   if (pthread_getcpuclockid (pthread_self (), &cl[0]) != 0)
  81     {
  82       puts ("own pthread_getcpuclockid failed");
  83       return 1;
  84     }
  85 # else
  86   cl[0] = CLOCK_THREAD_CPUTIME_ID;
  87 # endif
  88
  89   pthread_attr_t at;
  90
  91   if (pthread_attr_init (&at) != 0)
  92     {
  93       puts ("attr_init failed");
  94       return 1;
  95     }
  96
  97   if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
  98     {
  99       puts ("attr_setstacksize failed");
 100       return 1;
 101     }
 102
 103   int i;
 104   int e;
 105   for (i = 0; i < N; ++i)
 106     {
 107       if (pthread_create (&th[i], &at, tf, NULL) != 0)
 108         {
 109           puts ("create failed");
 110           return 1;
 111         }
 112
 113       e = pthread_barrier_wait (&b2);
 114       if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
 115         {
 116           puts ("barrier_wait failed");
 117           return 1;
 118         }
 119
 120       ts.tv_sec = 0;
 121       ts.tv_nsec = 100000000;
 122       TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
 123
 124       if (pthread_getcpuclockid (th[i], &cl[i + 1]) != 0)
 125         {
 126           puts ("pthread_getcpuclockid failed");
 127           return 1;
 128         }
 129     }
 130
 131   if (pthread_attr_destroy (&at) != 0)
 132     {
 133       puts ("attr_destroy failed");
 134       return 1;
 135     }
 136
 137   struct timespec t[N + 1];
 138   for (i = 0; i < N + 1; ++i)
 139     if (clock_gettime (cl[i], &t[i]) != 0)
 140       {
 141         printf ("clock_gettime round %d failed\n", i);
 142         return 1;
 143       }
 144
 145   for (i = 0; i < N; ++i)
 146     {
 147       struct timespec diff;
 148
 149       diff.tv_sec = t[i].tv_sec - t[i + 1].tv_sec;
 150       diff.tv_nsec = t[i].tv_nsec - t[i + 1].tv_nsec;
 151       if (diff.tv_nsec < 0)
 152         {
 153           diff.tv_nsec += 1000000000;
 154           --diff.tv_sec;
 155         }
 156
 157       if (diff.tv_sec < 0 || (diff.tv_sec == 0 && diff.tv_nsec < 100000000))
 158         {
 159           printf ("\
 160 difference between thread %d and %d too small (%ld.%09ld)\n",
 161                   i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);
 162           return 1;
 163         }
 164
 165       printf ("diff %d->%d: %ld.%09ld\n",
 166               i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);
 167     }
 168
 169   ts.tv_sec = 0;
 170   ts.tv_nsec = 0;
 171   for (i = 0; i < N + 1; ++i)
 172     if (clock_settime (cl[i], &ts) != 0)
 173       {
 174         printf ("clock_settime(%d) round %d failed\n", cl[i], i);
 175         return 1;
 176       }
 177
 178   for (i = 0; i < N + 1; ++i)
 179     {
 180       if (clock_gettime (cl[i], &ts) != 0)
 181         {
 182           puts ("clock_gettime failed");
 183           return 1;
 184         }
 185
 186       if (ts.tv_sec > t[i].tv_sec
 187           || (ts.tv_sec == t[i].tv_sec && ts.tv_nsec > t[i].tv_nsec))
 188         {
 189           puts ("clock_settime didn't reset clock");
 190           return 1;
 191         }
 192     }
 193 #endif
 194
 195   return 0;
 196 }
 197
 198
 199 #define TEST_FUNCTION do_test ()
 200 #include "../test-skeleton.c"