1  /* Copyright (C) 2002-2023 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 <error.h>
      19  #include <pthread.h>
      20  #include <stdio.h>
      21  #include <stdlib.h>
      22  
      23  
      24  static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
      25  static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
      26  
      27  
      28  static void *
      29  tf (void *p)
      30  {
      31    int err;
      32  
      33    err = pthread_mutex_lock (&mut);
      34    if (err != 0)
      35      error (EXIT_FAILURE, err, "child: cannot get mutex");
      36  
      37    puts ("child: got mutex; signalling");
      38  
      39    pthread_cond_signal (&cond);
      40  
      41    puts ("child: unlock");
      42  
      43    err = pthread_mutex_unlock (&mut);
      44    if (err != 0)
      45      error (EXIT_FAILURE, err, "child: cannot unlock");
      46  
      47    puts ("child: done");
      48  
      49    return NULL;
      50  }
      51  
      52  
      53  static int
      54  do_test (void)
      55  {
      56    pthread_t th;
      57    int err;
      58  
      59    printf ("&cond = %p\n&mut = %p\n", &cond, &mut);
      60  
      61    puts ("parent: get mutex");
      62  
      63    err = pthread_mutex_lock (&mut);
      64    if (err != 0)
      65      error (EXIT_FAILURE, err, "parent: cannot get mutex");
      66  
      67    puts ("parent: create child");
      68  
      69    err = pthread_create (&th, NULL, tf, NULL);
      70    if (err != 0)
      71      error (EXIT_FAILURE, err, "parent: cannot create thread");
      72  
      73    puts ("parent: wait for condition");
      74  
      75    /* This test will fail on spurious wake-ups, which are allowed; however,
      76       the current implementation shouldn't produce spurious wake-ups in the
      77       scenario we are testing here.  */
      78    err = pthread_cond_wait (&cond, &mut);
      79    if (err != 0)
      80      error (EXIT_FAILURE, err, "parent: cannot wait fir signal");
      81  
      82    puts ("parent: got signal");
      83  
      84    err = pthread_join (th, NULL);
      85    if (err != 0)
      86      error (EXIT_FAILURE, err, "parent: failed to join");
      87  
      88    puts ("done");
      89  
      90    return 0;
      91  }
      92  
      93  
      94  #define TEST_FUNCTION do_test ()
      95  #include "../test-skeleton.c"