nptl/tst-clock2.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 defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
  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 defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
  59 # define N 10
  60
  61 # if _POSIX_THREAD_CPUTIME == 0
  62   if (sysconf (_SC_THREAD_CPUTIME) < 0)
  63     {
  64       puts ("_POSIX_THREAD_CPUTIME option not available");
  65       return 0;
  66     }
  67 # endif
  68
  69   if (pthread_barrier_init (&b2, NULL, 2) != 0
  70       || pthread_barrier_init (&bN, NULL, N + 1) != 0)
  71     {
  72       puts ("barrier_init failed");
  73       return 1;
  74     }
  75
  76   struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 };
  77   TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
  78
  79   pthread_t th[N + 1];
  80   clockid_t cl[N + 1];
  81 # ifndef CLOCK_THREAD_CPUTIME_ID
  82   if (pthread_getcpuclockid (pthread_self (), &cl[0]) != 0)
  83     {
  84       puts ("own pthread_getcpuclockid failed");
  85       return 1;
  86     }
  87 # else
  88   cl[0] = CLOCK_THREAD_CPUTIME_ID;
  89 # endif
  90
  91   pthread_attr_t at;
  92
  93   if (pthread_attr_init (&at) != 0)
  94     {
  95       puts ("attr_init failed");
  96       return 1;
  97     }
  98
  99   if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
 100     {
 101       puts ("attr_setstacksize failed");
 102       return 1;
 103     }
 104
 105   int i;
 106   int e;
 107   for (i = 0; i < N; ++i)
 108     {
 109       if (pthread_create (&th[i], &at, tf, NULL) != 0)
 110         {
 111           puts ("create failed");
 112           return 1;
 113         }
 114
 115       e = pthread_barrier_wait (&b2);
 116       if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
 117         {
 118           puts ("barrier_wait failed");
 119           return 1;
 120         }
 121
 122       ts.tv_sec = 0;
 123       ts.tv_nsec = 100000000;
 124       TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
 125
 126       if (pthread_getcpuclockid (th[i], &cl[i + 1]) != 0)
 127         {
 128           puts ("pthread_getcpuclockid failed");
 129           return 1;
 130         }
 131     }
 132
 133   if (pthread_attr_destroy (&at) != 0)
 134     {
 135       puts ("attr_destroy failed");
 136       return 1;
 137     }
 138
 139   struct timespec t[N + 1];
 140   for (i = 0; i < N + 1; ++i)
 141     if (clock_gettime (cl[i], &t[i]) != 0)
 142       {
 143         printf ("clock_gettime round %d failed\n", i);
 144         return 1;
 145       }
 146
 147   for (i = 0; i < N; ++i)
 148     {
 149       struct timespec diff;
 150
 151       diff.tv_sec = t[i].tv_sec - t[i + 1].tv_sec;
 152       diff.tv_nsec = t[i].tv_nsec - t[i + 1].tv_nsec;
 153       if (diff.tv_nsec < 0)
 154         {
 155           diff.tv_nsec += 1000000000;
 156           --diff.tv_sec;
 157         }
 158
 159       if (diff.tv_sec < 0 || (diff.tv_sec == 0 && diff.tv_nsec < 100000000))
 160         {
 161           printf ("\
 162 difference between thread %d and %d too small (%ld.%09ld)\n",
 163                   i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);
 164           return 1;
 165         }
 166
 167       printf ("diff %d->%d: %ld.%09ld\n",
 168               i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);
 169     }
 170
 171   ts.tv_sec = 0;
 172   ts.tv_nsec = 0;
 173   for (i = 0; i < N + 1; ++i)
 174     if (clock_settime (cl[i], &ts) != 0)
 175       {
 176         printf ("clock_settime(%d) round %d failed\n", cl[i], i);
 177         return 1;
 178       }
 179
 180   for (i = 0; i < N + 1; ++i)
 181     {
 182       if (clock_gettime (cl[i], &ts) != 0)
 183         {
 184           puts ("clock_gettime failed");
 185           return 1;
 186         }
 187
 188       if (ts.tv_sec > t[i].tv_sec
 189           || (ts.tv_sec == t[i].tv_sec && ts.tv_nsec > t[i].tv_nsec))
 190         {
 191           puts ("clock_settime didn't reset clock");
 192           return 1;
 193         }
 194     }
 195 #endif
 196
 197   return 0;
 198 }
 199
 200
 201 #define TEST_FUNCTION do_test ()
 202 #include "../test-skeleton.c"