semaphore.h 1.1 KB

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  1. /* Copyright (C) 2002-2016 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, see
  13. <http://www.gnu.org/licenses/>. */
  14. #ifndef _SEMAPHORE_H
  15. # error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead."
  16. #endif
  17. #define __SIZEOF_SEM_T 16
  18. /* Value returned if `sem_open' failed. */
  19. #define SEM_FAILED ((sem_t *) 0)
  20. typedef union
  21. {
  22. char __size[__SIZEOF_SEM_T];
  23. long int __align;
  24. } sem_t;