1  /* pthread_cond_destroy.  Generic version.
       2     Copyright (C) 2002-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       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 <pthread.h>
      20  #include <pt-internal.h>
      21  
      22  int
      23  __pthread_cond_destroy (pthread_cond_t *cond)
      24  {
      25    /* Set the wake request flag. */
      26    unsigned int wrefs = atomic_fetch_or_acquire (&cond->__wrefs, 1);
      27  
      28    __pthread_spin_wait (&cond->__lock);
      29    if (cond->__queue)
      30      {
      31        __pthread_spin_unlock (&cond->__lock);
      32        return EBUSY;
      33      }
      34    __pthread_spin_unlock (&cond->__lock);
      35  
      36    while (wrefs >> 1 != 0)
      37      {
      38        __gsync_wait (__mach_task_self (), (vm_offset_t) &cond->__wrefs, wrefs,
      39  		  0, 0, 0);
      40        wrefs = atomic_load_acquire (&cond->__wrefs);
      41      }
      42    /* The memory the condvar occupies can now be reused.  */
      43  
      44    return 0;
      45  }
      46  
      47  weak_alias (__pthread_cond_destroy, pthread_cond_destroy);