sysdeps/pthread/tst-cond20.c

   1 /* Copyright (C) 2004-2024 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 <pthread.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23
  24 #define N 10
  25 #define ROUNDS 1000
  26 static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
  27 static pthread_cond_t cond2 = PTHREAD_COND_INITIALIZER;
  28 static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
  29 static pthread_barrier_t b;
  30 static int count;
  31
  32 static void *
  33 tf (void *p)
  34 {
  35   int i;
  36   for (i = 0; i < ROUNDS; ++i)
  37     {
  38       pthread_mutex_lock (&mut);
  39
  40       if (++count == N)
  41         pthread_cond_signal (&cond2);
  42
  43 #ifdef TIMED
  44       struct timeval tv;
  45       gettimeofday (&tv, NULL);
  46       struct timespec ts;
  47       /* Wait three seconds.  */
  48       ts.tv_sec = tv.tv_sec + 3;
  49       ts.tv_nsec = tv.tv_usec * 1000;
  50       pthread_cond_timedwait (&cond, &mut, &ts);
  51 #else
  52       pthread_cond_wait (&cond, &mut);
  53 #endif
  54
  55       pthread_mutex_unlock (&mut);
  56
  57       int err = pthread_barrier_wait (&b);
  58       if (err != 0 && err != PTHREAD_BARRIER_SERIAL_THREAD)
  59         {
  60           puts ("child: barrier_wait failed");
  61           exit (1);
  62         }
  63
  64       err = pthread_barrier_wait (&b);
  65       if (err != 0 && err != PTHREAD_BARRIER_SERIAL_THREAD)
  66         {
  67           puts ("child: barrier_wait failed");
  68           exit (1);
  69         }
  70     }
  71
  72   return NULL;
  73 }
  74
  75
  76 static int
  77 do_test (void)
  78 {
  79   if (pthread_barrier_init (&b, NULL, N + 1) != 0)
  80     {
  81       puts ("barrier_init failed");
  82       return 1;
  83     }
  84
  85   pthread_mutex_lock (&mut);
  86
  87   int i, j, err;
  88   pthread_t th[N];
  89   for (i = 0; i < N; ++i)
  90     if ((err = pthread_create (&th[i], NULL, tf, NULL)) != 0)
  91       {
  92         printf ("cannot create thread %d: %s\n", i, strerror (err));
  93         return 1;
  94       }
  95
  96   for (i = 0; i < ROUNDS; ++i)
  97     {
  98       /* Make sure we discard spurious wake-ups.  */
  99       do
 100         pthread_cond_wait (&cond2, &mut);
 101       while (count != N);
 102
 103       if (i & 1)
 104         pthread_mutex_unlock (&mut);
 105
 106       if (i & 2)
 107         pthread_cond_broadcast (&cond);
 108       else if (i & 4)
 109         for (j = 0; j < N; ++j)
 110           pthread_cond_signal (&cond);
 111       else
 112         {
 113           for (j = 0; j < (i / 8) % N; ++j)
 114             pthread_cond_signal (&cond);
 115           pthread_cond_broadcast (&cond);
 116         }
 117
 118       if ((i & 1) == 0)
 119         pthread_mutex_unlock (&mut);
 120
 121       err = pthread_cond_destroy (&cond);
 122       if (err)
 123         {
 124           printf ("pthread_cond_destroy failed: %s\n", strerror (err));
 125           return 1;
 126         }
 127
 128       /* Now clobber the cond variable which has been successfully
 129          destroyed above.  */
 130       memset (&cond, (char) i, sizeof (cond));
 131
 132       err = pthread_barrier_wait (&b);
 133       if (err != 0 && err != PTHREAD_BARRIER_SERIAL_THREAD)
 134         {
 135           puts ("parent: barrier_wait failed");
 136           return 1;
 137         }
 138
 139       pthread_mutex_lock (&mut);
 140
 141       err = pthread_barrier_wait (&b);
 142       if (err != 0 && err != PTHREAD_BARRIER_SERIAL_THREAD)
 143         {
 144           puts ("parent: barrier_wait failed");
 145           return 1;
 146         }
 147
 148       count = 0;
 149       err = pthread_cond_init (&cond, NULL);
 150       if (err)
 151         {
 152           printf ("pthread_cond_init failed: %s\n", strerror (err));
 153           return 1;
 154         }
 155     }
 156
 157   for (i = 0; i < N; ++i)
 158     if ((err = pthread_join (th[i], NULL)) != 0)
 159       {
 160         printf ("failed to join thread %d: %s\n", i, strerror (err));
 161         return 1;
 162       }
 163
 164   puts ("done");
 165
 166   return 0;
 167 }
 168
 169
 170 #define TEST_FUNCTION do_test ()
 171 #include "../test-skeleton.c"