nptl/tst-cond1.c

   1 /* Copyright (C) 2002-2019 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    <https://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_cond_t cond = PTHREAD_COND_INITIALIZER;
  26 static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
  27
  28
  29 static void *
  30 tf (void *p)
  31 {
  32   int err;
  33
  34   err = pthread_mutex_lock (&mut);
  35   if (err != 0)
  36     error (EXIT_FAILURE, err, "child: cannot get mutex");
  37
  38   puts ("child: got mutex; signalling");
  39
  40   pthread_cond_signal (&cond);
  41
  42   puts ("child: unlock");
  43
  44   err = pthread_mutex_unlock (&mut);
  45   if (err != 0)
  46     error (EXIT_FAILURE, err, "child: cannot unlock");
  47
  48   puts ("child: done");
  49
  50   return NULL;
  51 }
  52
  53
  54 static int
  55 do_test (void)
  56 {
  57   pthread_t th;
  58   int err;
  59
  60   printf ("&cond = %p\n&mut = %p\n", &cond, &mut);
  61
  62   puts ("parent: get mutex");
  63
  64   err = pthread_mutex_lock (&mut);
  65   if (err != 0)
  66     error (EXIT_FAILURE, err, "parent: cannot get mutex");
  67
  68   puts ("parent: create child");
  69
  70   err = pthread_create (&th, NULL, tf, NULL);
  71   if (err != 0)
  72     error (EXIT_FAILURE, err, "parent: cannot create thread");
  73
  74   puts ("parent: wait for condition");
  75
  76   /* This test will fail on spurious wake-ups, which are allowed; however,
  77      the current implementation shouldn't produce spurious wake-ups in the
  78      scenario we are testing here.  */
  79   err = pthread_cond_wait (&cond, &mut);
  80   if (err != 0)
  81     error (EXIT_FAILURE, err, "parent: cannot wait fir signal");
  82
  83   puts ("parent: got signal");
  84
  85   err = pthread_join (th, NULL);
  86   if (err != 0)
  87     error (EXIT_FAILURE, err, "parent: failed to join");
  88
  89   puts ("done");
  90
  91   return 0;
  92 }
  93
  94
  95 #define TEST_FUNCTION do_test ()
  96 #include "../test-skeleton.c"