nptl/tst-cond20.c

   1 /* Copyright (C) 2004-2019 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.
   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 <pthread.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24
  25 #define N 10
  26 #define ROUNDS 1000
  27 static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
  28 static pthread_cond_t cond2 = PTHREAD_COND_INITIALIZER;
  29 static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
  30 static pthread_barrier_t b;
  31 static int count;
  32
  33 static void *
  34 tf (void *p)
  35 {
  36   int i;
  37   for (i = 0; i < ROUNDS; ++i)
  38     {
  39       pthread_mutex_lock (&mut);
  40
  41       if (++count == N)
  42         pthread_cond_signal (&cond2);
  43
  44 #ifdef TIMED
  45       struct timeval tv;
  46       gettimeofday (&tv, NULL);
  47       struct timespec ts;
  48       /* Wait three seconds.  */
  49       ts.tv_sec = tv.tv_sec + 3;
  50       ts.tv_nsec = tv.tv_usec * 1000;
  51       pthread_cond_timedwait (&cond, &mut, &ts);
  52 #else
  53       pthread_cond_wait (&cond, &mut);
  54 #endif
  55
  56       pthread_mutex_unlock (&mut);
  57
  58       int err = pthread_barrier_wait (&b);
  59       if (err != 0 && err != PTHREAD_BARRIER_SERIAL_THREAD)
  60         {
  61           puts ("child: barrier_wait failed");
  62           exit (1);
  63         }
  64
  65       err = pthread_barrier_wait (&b);
  66       if (err != 0 && err != PTHREAD_BARRIER_SERIAL_THREAD)
  67         {
  68           puts ("child: barrier_wait failed");
  69           exit (1);
  70         }
  71     }
  72
  73   return NULL;
  74 }
  75
  76
  77 static int
  78 do_test (void)
  79 {
  80   if (pthread_barrier_init (&b, NULL, N + 1) != 0)
  81     {
  82       puts ("barrier_init failed");
  83       return 1;
  84     }
  85
  86   pthread_mutex_lock (&mut);
  87
  88   int i, j, err;
  89   pthread_t th[N];
  90   for (i = 0; i < N; ++i)
  91     if ((err = pthread_create (&th[i], NULL, tf, NULL)) != 0)
  92       {
  93         printf ("cannot create thread %d: %s\n", i, strerror (err));
  94         return 1;
  95       }
  96
  97   for (i = 0; i < ROUNDS; ++i)
  98     {
  99       /* Make sure we discard spurious wake-ups.  */
 100       do
 101         pthread_cond_wait (&cond2, &mut);
 102       while (count != N);
 103
 104       if (i & 1)
 105         pthread_mutex_unlock (&mut);
 106
 107       if (i & 2)
 108         pthread_cond_broadcast (&cond);
 109       else if (i & 4)
 110         for (j = 0; j < N; ++j)
 111           pthread_cond_signal (&cond);
 112       else
 113         {
 114           for (j = 0; j < (i / 8) % N; ++j)
 115             pthread_cond_signal (&cond);
 116           pthread_cond_broadcast (&cond);
 117         }
 118
 119       if ((i & 1) == 0)
 120         pthread_mutex_unlock (&mut);
 121
 122       err = pthread_cond_destroy (&cond);
 123       if (err)
 124         {
 125           printf ("pthread_cond_destroy failed: %s\n", strerror (err));
 126           return 1;
 127         }
 128
 129       /* Now clobber the cond variable which has been successfully
 130          destroyed above.  */
 131       memset (&cond, (char) i, sizeof (cond));
 132
 133       err = pthread_barrier_wait (&b);
 134       if (err != 0 && err != PTHREAD_BARRIER_SERIAL_THREAD)
 135         {
 136           puts ("parent: barrier_wait failed");
 137           return 1;
 138         }
 139
 140       pthread_mutex_lock (&mut);
 141
 142       err = pthread_barrier_wait (&b);
 143       if (err != 0 && err != PTHREAD_BARRIER_SERIAL_THREAD)
 144         {
 145           puts ("parent: barrier_wait failed");
 146           return 1;
 147         }
 148
 149       count = 0;
 150       err = pthread_cond_init (&cond, NULL);
 151       if (err)
 152         {
 153           printf ("pthread_cond_init failed: %s\n", strerror (err));
 154           return 1;
 155         }
 156     }
 157
 158   for (i = 0; i < N; ++i)
 159     if ((err = pthread_join (th[i], NULL)) != 0)
 160       {
 161         printf ("failed to join thread %d: %s\n", i, strerror (err));
 162         return 1;
 163       }
 164
 165   puts ("done");
 166
 167   return 0;
 168 }
 169
 170
 171 #define TEST_FUNCTION do_test ()
 172 #include "../test-skeleton.c"