sysdeps/htl/pt-key-delete.c

   1 /* pthread_key_delete.  Hurd version.
   2    Copyright (C) 2002-2018 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    <http://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       __pthread_rwlock_rdlock (&__pthread_threads_lock);
  43       for (i = 0; i < __pthread_num_threads; ++i)
  44         {
  45           struct __pthread *t;
  46
  47           t = __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       __pthread_rwlock_unlock (&__pthread_threads_lock);
  58     }
  59
  60   __pthread_mutex_unlock (&__pthread_key_lock);
  61
  62   return err;
  63 }