pthread_setschedparam.c 2.3 KB

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  1. /* Copyright (C) 2002, 2003, 2004, 2006, 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, 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 <sched.h>
  18. #include <string.h>
  19. #include "pthreadP.h"
  20. #include <lowlevellock.h>
  21. int
  22. __pthread_setschedparam (
  23. pthread_t threadid,
  24. int policy,
  25. const struct sched_param *param)
  26. {
  27. struct pthread *pd = (struct pthread *) threadid;
  28. /* Make sure the descriptor is valid. */
  29. if (INVALID_TD_P (pd))
  30. /* Not a valid thread handle. */
  31. return ESRCH;
  32. int result = 0;
  33. lll_lock (pd->lock, LLL_PRIVATE);
  34. struct sched_param p;
  35. const struct sched_param *orig_param = param;
  36. /* If the thread should have higher priority because of some
  37. PTHREAD_PRIO_PROTECT mutexes it holds, adjust the priority. */
  38. if (__builtin_expect (pd->tpp != NULL, 0)
  39. && pd->tpp->priomax > param->sched_priority)
  40. {
  41. p = *param;
  42. p.sched_priority = pd->tpp->priomax;
  43. param = &p;
  44. }
  45. /* Try to set the scheduler information. */
  46. if (__builtin_expect (__sched_setscheduler (pd->tid, policy,
  47. param) == -1, 0))
  48. result = errno;
  49. else
  50. {
  51. /* We succeeded changing the kernel information. Reflect this
  52. change in the thread descriptor. */
  53. pd->schedpolicy = policy;
  54. memcpy (&pd->schedparam, orig_param, sizeof (struct sched_param));
  55. pd->flags |= ATTR_FLAG_SCHED_SET | ATTR_FLAG_POLICY_SET;
  56. }
  57. lll_unlock (pd->lock, LLL_PRIVATE);
  58. return result;
  59. }
  60. strong_alias (__pthread_setschedparam, pthread_setschedparam)