nptl/tst-cond2.c

   1 /* Copyright (C) 2002-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <error.h>
  20 #include <pthread.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23
  24
  25 static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
  26 static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
  27
  28 static pthread_barrier_t bar;
  29
  30
  31 static void *
  32 tf (void *a)
  33 {
  34   int i = (long int) a;
  35   int err;
  36
  37   printf ("child %d: lock\n", i);
  38
  39   err = pthread_mutex_lock (&mut);
  40   if (err != 0)
  41     error (EXIT_FAILURE, err, "locking in child failed");
  42
  43   printf ("child %d: sync\n", i);
  44
  45   int e = pthread_barrier_wait (&bar);
  46   if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
  47     {
  48       puts ("child: barrier_wait failed");
  49       exit (1);
  50     }
  51
  52   printf ("child %d: wait\n", i);
  53
  54   err = pthread_cond_wait (&cond, &mut);
  55   if (err != 0)
  56     error (EXIT_FAILURE, err, "child %d: failed to wait", i);
  57
  58   printf ("child %d: woken up\n", i);
  59
  60   err = pthread_mutex_unlock (&mut);
  61   if (err != 0)
  62     error (EXIT_FAILURE, err, "child %d: unlock[2] failed", i);
  63
  64   printf ("child %d: done\n", i);
  65
  66   return NULL;
  67 }
  68
  69
  70 #define N 10
  71
  72
  73 static int
  74 do_test (void)
  75 {
  76   pthread_t th[N];
  77   int i;
  78   int err;
  79
  80   printf ("&cond = %p\n&mut = %p\n", &cond, &mut);
  81
  82   if (pthread_barrier_init (&bar, NULL, 2) != 0)
  83     {
  84       puts ("barrier_init failed");
  85       exit (1);
  86     }
  87
  88   pthread_attr_t at;
  89
  90   if (pthread_attr_init (&at) != 0)
  91     {
  92       puts ("attr_init failed");
  93       return 1;
  94     }
  95
  96   if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
  97     {
  98       puts ("attr_setstacksize failed");
  99       return 1;
 100     }
 101
 102   for (i = 0; i < N; ++i)
 103     {
 104       printf ("create thread %d\n", i);
 105
 106       err = pthread_create (&th[i], &at, tf, (void *) (long int) i);
 107       if (err != 0)
 108         error (EXIT_FAILURE, err, "cannot create thread %d", i);
 109
 110       printf ("wait for child %d\n", i);
 111
 112       /* Wait for the child to start up and get the mutex for the
 113          conditional variable.  */
 114       int e = pthread_barrier_wait (&bar);
 115       if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
 116         {
 117           puts ("barrier_wait failed");
 118           exit (1);
 119         }
 120     }
 121
 122   if (pthread_attr_destroy (&at) != 0)
 123     {
 124       puts ("attr_destroy failed");
 125       return 1;
 126     }
 127
 128   puts ("get lock outselves");
 129
 130   err = pthread_mutex_lock (&mut);
 131   if (err != 0)
 132     error (EXIT_FAILURE, err, "mut locking failed");
 133
 134   puts ("broadcast");
 135
 136   /* Wake up all threads.  */
 137   err = pthread_cond_broadcast (&cond);
 138   if (err != 0)
 139     error (EXIT_FAILURE, err, "parent: broadcast failed");
 140
 141   err = pthread_mutex_unlock (&mut);
 142   if (err != 0)
 143     error (EXIT_FAILURE, err, "mut unlocking failed");
 144
 145   /* Join all threads.  */
 146   for (i = 0; i < N; ++i)
 147     {
 148       printf ("join thread %d\n", i);
 149
 150       err = pthread_join (th[i], NULL);
 151       if (err != 0)
 152         error (EXIT_FAILURE, err, "join of child %d failed", i);
 153     }
 154
 155   puts ("done");
 156
 157   return 0;
 158 }
 159
 160
 161 #define TEST_FUNCTION do_test ()
 162 #include "../test-skeleton.c"