sem_init.c 1.5 KB

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  1. /* Copyright (C) 2002, 2007 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, see
  14. <http://www.gnu.org/licenses/>. */
  15. #include <errno.h>
  16. #include <semaphore.h>
  17. #include <lowlevellock.h>
  18. #include "semaphoreP.h"
  19. #include <bits/kernel-features.h>
  20. int
  21. sem_init (
  22. sem_t *sem,
  23. int pshared,
  24. unsigned int value)
  25. {
  26. /* Parameter sanity check. */
  27. if (__builtin_expect (value > SEM_VALUE_MAX, 0))
  28. {
  29. __set_errno (EINVAL);
  30. return -1;
  31. }
  32. /* Map to the internal type. */
  33. struct new_sem *isem = (struct new_sem *) sem;
  34. /* Use the values the user provided. */
  35. isem->value = value;
  36. #ifdef __ASSUME_PRIVATE_FUTEX
  37. isem->private = pshared ? 0 : FUTEX_PRIVATE_FLAG;
  38. #else
  39. isem->private = pshared ? 0 : THREAD_GETMEM (THREAD_SELF,
  40. header.private_futex);
  41. #endif
  42. isem->nwaiters = 0;
  43. return 0;
  44. }