nptl/tst-cond2.c

   1 /* Copyright (C) 2002 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
  30 static void *
  31 tf (void *a)
  32 {
  33   int i = (long int) a;
  34   int err;
  35
  36   printf ("child %d: wait\n", i);
  37
  38   err = pthread_cond_wait (&cond, &mut);
  39   if (err != 0)
  40     error (EXIT_FAILURE, err, "child %d: failed to wait", i);
  41
  42   printf ("child %d: woken up\n", i);
  43
  44   err = pthread_mutex_unlock (&mut);
  45   if (err != 0)
  46     error (EXIT_FAILURE, err, "child %d: unlock failed", i);
  47
  48   printf ("child %d: done\n", i);
  49
  50   return NULL;
  51 }
  52
  53
  54 #define N 10
  55
  56
  57 static int
  58 do_test (void)
  59 {
  60   pthread_t th[N];
  61   int i;
  62   int err;
  63
  64   printf ("&cond = %p\n&mut = %p\n", &cond, &mut);
  65
  66   puts ("first lock");
  67
  68   err = pthread_mutex_lock (&mut);
  69   if (err != 0)
  70     error (EXIT_FAILURE, err, "initial locking failed");
  71
  72   for (i = 0; i < N; ++i)
  73     {
  74       printf ("create thread %d\n", i);
  75
  76       err = pthread_create (&th[i], NULL, tf, (void *) (long int) i);
  77       if (err != 0)
  78         error (EXIT_FAILURE, err, "cannot create thread %d", i);
  79
  80       printf ("wait for child %d\n", i);
  81
  82       /* Lock and thereby wait for the child to start up and get the
  83          conditional variable.  */
  84       pthread_mutex_lock (&mut);
  85     }
  86
  87   puts ("final unlock");
  88
  89   /* Unlock in preparation of the broadcast.  */
  90   err = pthread_mutex_unlock (&mut);
  91   if (err != 0)
  92     error (EXIT_FAILURE, err, "parent: unlock failed");
  93
  94   puts ("broadcast");
  95
  96   /* Wake up all threads.  */
  97   err = pthread_cond_broadcast (&cond);
  98   if (err != 0)
  99     error (EXIT_FAILURE, err, "parent: broadcast failed");
 100
 101   /* Join all threads.  */
 102   for (i = 0; i < N; ++i)
 103     {
 104       printf ("join thread %d\n", i);
 105
 106       err = pthread_join (th[i], NULL);
 107       if (err != 0)
 108         error (EXIT_FAILURE, err, "join of child %d failed", i);
 109     }
 110
 111   puts ("done");
 112
 113   return 0;
 114 }
 115
 116
 117 #define TEST_FUNCTION do_test ()
 118 #include "../test-skeleton.c"