nptl/tst-cond2.c

   1 /* Copyright (C) 2002, 2003 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <error.h>
  21 #include <pthread.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24
  25
  26 static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
  27 static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
  28
  29 static pthread_barrier_t bar;
  30
  31
  32 static void *
  33 tf (void *a)
  34 {
  35   int i = (long int) a;
  36   int err;
  37
  38   printf ("child %d: lock\n", i);
  39
  40   err = pthread_mutex_lock (&mut);
  41   if (err != 0)
  42     error (EXIT_FAILURE, err, "locking in child failed");
  43
  44   printf ("child %d: sync\n", i);
  45
  46   int e = pthread_barrier_wait (&bar);
  47   if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
  48     {
  49       puts ("child: barrier_wait failed");
  50       exit (1);
  51     }
  52
  53   printf ("child %d: wait\n", i);
  54
  55   err = pthread_cond_wait (&cond, &mut);
  56   if (err != 0)
  57     error (EXIT_FAILURE, err, "child %d: failed to wait", i);
  58
  59   printf ("child %d: woken up\n", i);
  60
  61   err = pthread_mutex_unlock (&mut);
  62   if (err != 0)
  63     error (EXIT_FAILURE, err, "child %d: unlock[2] failed", i);
  64
  65   printf ("child %d: done\n", i);
  66
  67   return NULL;
  68 }
  69
  70
  71 #define N 10
  72
  73
  74 static int
  75 do_test (void)
  76 {
  77   pthread_t th[N];
  78   int i;
  79   int err;
  80
  81   printf ("&cond = %p\n&mut = %p\n", &cond, &mut);
  82
  83   if (pthread_barrier_init (&bar, NULL, 2) != 0)
  84     {
  85       puts ("barrier_init failed");
  86       exit (1);
  87     }
  88
  89   for (i = 0; i < N; ++i)
  90     {
  91       printf ("create thread %d\n", i);
  92
  93       err = pthread_create (&th[i], NULL, tf, (void *) (long int) i);
  94       if (err != 0)
  95         error (EXIT_FAILURE, err, "cannot create thread %d", i);
  96
  97       printf ("wait for child %d\n", i);
  98
  99       /* Wait for the child to start up and get the mutex for the
 100          conditional variable.  */
 101       int e = pthread_barrier_wait (&bar);
 102       if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
 103         {
 104           puts ("barrier_wait failed");
 105           exit (1);
 106         }
 107     }
 108
 109   puts ("get lock outselves");
 110
 111   err = pthread_mutex_lock (&mut);
 112   if (err != 0)
 113     error (EXIT_FAILURE, err, "mut locking failed");
 114
 115   puts ("broadcast");
 116
 117   /* Wake up all threads.  */
 118   err = pthread_cond_broadcast (&cond);
 119   if (err != 0)
 120     error (EXIT_FAILURE, err, "parent: broadcast failed");
 121
 122   err = pthread_mutex_unlock (&mut);
 123   if (err != 0)
 124     error (EXIT_FAILURE, err, "mut unlocking failed");
 125
 126   /* Join all threads.  */
 127   for (i = 0; i < N; ++i)
 128     {
 129       printf ("join thread %d\n", i);
 130
 131       err = pthread_join (th[i], NULL);
 132       if (err != 0)
 133         error (EXIT_FAILURE, err, "join of child %d failed", i);
 134     }
 135
 136   puts ("done");
 137
 138   return 0;
 139 }
 140
 141
 142 #define TEST_FUNCTION do_test ()
 143 #include "../test-skeleton.c"