linuxthreads/tst-clock1.c

   1 /* Copyright (C) 2003, 2004 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <pthread.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <time.h>
  25 #include <unistd.h>
  26
  27
  28 #if _POSIX_THREAD_CPUTIME
  29 static pthread_barrier_t b2;
  30 static pthread_barrier_t bN;
  31
  32
  33 static void *
  34 tf (void *arg)
  35 {
  36   int e = pthread_barrier_wait (&b2);
  37   if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
  38     {
  39       puts ("barrier_wait failed");
  40       exit (1);
  41     }
  42
  43   e = pthread_barrier_wait (&bN);
  44   if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
  45     {
  46       puts ("barrier_wait failed");
  47       exit (1);
  48     }
  49
  50   return NULL;
  51 }
  52 #endif
  53
  54
  55 int
  56 do_test (void)
  57 {
  58 #if _POSIX_THREAD_CPUTIME
  59 # define N 10
  60
  61   if (pthread_barrier_init (&b2, NULL, 2) != 0
  62       || pthread_barrier_init (&bN, NULL, N + 1) != 0)
  63     {
  64       puts ("barrier_init failed");
  65       return 1;
  66     }
  67
  68   struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 };
  69   TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
  70
  71   pthread_t th[N + 1];
  72   clockid_t cl[N + 1];
  73 # ifndef CLOCK_THREAD_CPUTIME_ID
  74   if (pthread_getcpuclockid (pthread_self (), &cl[0]) != 0)
  75     {
  76       puts ("own pthread_getcpuclockid failed");
  77       return 1;
  78     }
  79 # else
  80   cl[0] = CLOCK_THREAD_CPUTIME_ID;
  81 # endif
  82
  83   pthread_attr_t at;
  84
  85   if (pthread_attr_init (&at) != 0)
  86     {
  87       puts ("attr_init failed");
  88       return 1;
  89     }
  90
  91   if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
  92     {
  93       puts ("attr_setstacksize failed");
  94       return 1;
  95     }
  96
  97   int i;
  98   int e;
  99   for (i = 0; i < N; ++i)
 100     {
 101       if (pthread_create (&th[i], &at, tf, NULL) != 0)
 102         {
 103           puts ("create failed");
 104           return 1;
 105         }
 106
 107       e = pthread_barrier_wait (&b2);
 108       if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
 109         {
 110           puts ("barrier_wait failed");
 111           return 1;
 112         }
 113
 114       ts.tv_sec = 0;
 115       ts.tv_nsec = 100000000;
 116       TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
 117
 118       if (pthread_getcpuclockid (th[i], &cl[i + 1]) != 0)
 119         {
 120           puts ("pthread_getcpuclockid failed");
 121           return 1;
 122         }
 123     }
 124
 125   if (pthread_attr_destroy (&at) != 0)
 126     {
 127       puts ("attr_destroy failed");
 128       return 1;
 129     }
 130
 131   struct timespec t[N + 1];
 132   for (i = 0; i < N + 1; ++i)
 133     if (clock_gettime (cl[i], &t[i]) != 0)
 134       {
 135         printf ("clock_gettime round %d failed\n", i);
 136         return 1;
 137       }
 138
 139   for (i = 0; i < N; ++i)
 140     {
 141       struct timespec diff;
 142
 143       diff.tv_sec = t[i].tv_sec - t[i + 1].tv_sec;
 144       diff.tv_nsec = t[i].tv_nsec - t[i + 1].tv_nsec;
 145       if (diff.tv_nsec < 0)
 146         {
 147           diff.tv_nsec += 1000000000;
 148           --diff.tv_sec;
 149         }
 150
 151       if (diff.tv_sec < 0 || (diff.tv_sec == 0 && diff.tv_nsec < 100000000))
 152         {
 153           printf ("\
 154 difference between thread %d and %d too small (%ld.%09ld)\n",
 155                   i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);
 156           return 1;
 157         }
 158
 159       printf ("diff %d->%d: %ld.%09ld\n",
 160               i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);
 161     }
 162
 163   ts.tv_sec = 0;
 164   ts.tv_nsec = 0;
 165   for (i = 0; i < N + 1; ++i)
 166     if (clock_settime (cl[i], &ts) != 0)
 167       {
 168         printf ("clock_settime(%d) round %d failed\n", cl[i], i);
 169         return 1;
 170       }
 171
 172   for (i = 0; i < N + 1; ++i)
 173     {
 174       if (clock_gettime (cl[i], &ts) != 0)
 175         {
 176           puts ("clock_gettime failed");
 177           return 1;
 178         }
 179
 180       if (ts.tv_sec > t[i].tv_sec
 181           || (ts.tv_sec == t[i].tv_sec && ts.tv_nsec > t[i].tv_nsec))
 182         {
 183           puts ("clock_settime didn't reset clock");
 184           return 1;
 185         }
 186     }
 187 #endif
 188
 189   return 0;
 190 }
 191
 192
 193 #define TEST_FUNCTION do_test ()
 194 #include "../test-skeleton.c"