pthread_key_delete.c 1.3 KB

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  1. /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #include <errno.h>
  17. #include "pthreadP.h"
  18. #include <atomic.h>
  19. int
  20. pthread_key_delete (pthread_key_t key)
  21. {
  22. int result = EINVAL;
  23. if (__builtin_expect (key < PTHREAD_KEYS_MAX, 1))
  24. {
  25. unsigned int seq = __pthread_keys[key].seq;
  26. if (__builtin_expect (! KEY_UNUSED (seq), 1)
  27. && ! atomic_compare_and_exchange_bool_acq (&__pthread_keys[key].seq,
  28. seq + 1, seq))
  29. /* We deleted a valid key. */
  30. result = 0;
  31. }
  32. return result;
  33. }