1  /* Verify that TLS access in separate thread in a dlopened library does not
       2     deadlock - the module.
       3     Copyright (C) 2015-2023 Free Software Foundation, Inc.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  #include <stdio.h>
      21  #include <stdlib.h>
      22  #include <string.h>
      23  #include <pthread.h>
      24  #include <atomic.h>
      25  
      26  static pthread_t th;
      27  static int running = 1;
      28  
      29  static void *
      30  test_run (void *p)
      31  {
      32    while (atomic_load_relaxed (&running))
      33      printf ("Test running\n");
      34    printf ("Test finished\n");
      35    return NULL;
      36  }
      37  
      38  static void __attribute__ ((constructor))
      39  do_init (void)
      40  {
      41    int ret = pthread_create (&th, NULL, test_run, NULL);
      42  
      43    if (ret != 0)
      44      {
      45        printf ("failed to create thread: %s (%d)\n", strerror (ret), ret);
      46        exit (1);
      47      }
      48  }
      49  
      50  static void __attribute__ ((destructor))
      51  do_end (void)
      52  {
      53    atomic_store_relaxed (&running, 0);
      54    int ret = pthread_join (th, NULL);
      55  
      56    if (ret != 0)
      57      {
      58        printf ("pthread_join: %s(%d)\n", strerror (ret), ret);
      59        exit (1);
      60      }
      61  
      62    printf ("Thread joined\n");
      63  }