1  /* Test of spin locks for communication between threads and signal handlers.
       2     Copyright (C) 2005, 2008-2023 Free Software Foundation, Inc.
       3  
       4     This program is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU General Public License as published by
       6     the Free Software Foundation, either version 3 of the License, or
       7     (at your option) any later version.
       8  
       9     This program 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
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Bruno Haible <bruno@clisp.org>, 2020.  */
      18  
      19  #include <config.h>
      20  
      21  /* Specification.  */
      22  #include "asyncsafe-spin.h"
      23  
      24  #include <signal.h>
      25  
      26  asyncsafe_spinlock_t global_spin_lock = ASYNCSAFE_SPIN_INIT;
      27  
      28  int
      29  main (void)
      30  {
      31    sigset_t set;
      32  
      33    sigemptyset (&set);
      34    sigaddset (&set, SIGINT);
      35  
      36    /* Check a spin-lock initialized through the constant initializer.  */
      37    {
      38      sigset_t saved_set;
      39      asyncsafe_spin_lock (&global_spin_lock, &set, &saved_set);
      40      asyncsafe_spin_unlock (&global_spin_lock, &saved_set);
      41    }
      42  
      43    /* Check a spin-lock initialized through asyncsafe_spin_init.  */
      44    {
      45      asyncsafe_spinlock_t local_spin_lock;
      46      int i;
      47  
      48      asyncsafe_spin_init (&local_spin_lock);
      49  
      50      for (i = 0; i < 10; i++)
      51        {
      52          sigset_t saved_set;
      53          asyncsafe_spin_lock (&local_spin_lock, &set, &saved_set);
      54          asyncsafe_spin_unlock (&local_spin_lock, &saved_set);
      55        }
      56  
      57      asyncsafe_spin_destroy (&local_spin_lock);
      58    }
      59  
      60    return 0;
      61  }