1  /* pthread_key_delete.  Hurd 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  
      21  #include <pt-internal.h>
      22  
      23  int
      24  __pthread_key_delete (pthread_key_t key)
      25  {
      26    error_t err = 0;
      27  
      28    __pthread_key_lock_ready ();
      29  
      30    __pthread_mutex_lock (&__pthread_key_lock);
      31  
      32    if (key < 0 || key >= __pthread_key_count
      33        || __pthread_key_destructors[key] == PTHREAD_KEY_INVALID)
      34      err = EINVAL;
      35    else
      36      {
      37        int i;
      38  
      39        __pthread_key_destructors[key] = PTHREAD_KEY_INVALID;
      40        __pthread_key_invalid_count++;
      41  
      42        __libc_rwlock_rdlock (GL (dl_pthread_threads_lock));
      43        for (i = 0; i < GL (dl_pthread_num_threads); ++i)
      44  	{
      45  	  struct __pthread *t;
      46  
      47  	  t = GL (dl_pthread_threads)[i];
      48  
      49  	  if (t == NULL)
      50  	    continue;
      51  
      52  	  /* Just remove the key, no need to care whether it was
      53  	     already there. */
      54  	  if (key < t->thread_specifics_size)
      55  	    t->thread_specifics[key] = 0;
      56  	}
      57        __libc_rwlock_unlock (GL (dl_pthread_threads_lock));
      58      }
      59  
      60    __pthread_mutex_unlock (&__pthread_key_lock);
      61  
      62    return err;
      63  }
      64  weak_alias (__pthread_key_delete, pthread_key_delete)