timer_delete.c 2.1 KB

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  1. /* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
  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 License as
  6. published by the Free Software Foundation; either version 2.1 of the
  7. 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; see the file COPYING.LIB. If
  14. not, see <http://www.gnu.org/licenses/>. */
  15. #include <assert.h>
  16. #include <errno.h>
  17. #include <pthread.h>
  18. #include <time.h>
  19. #include "posix-timer.h"
  20. /* Delete timer TIMERID. */
  21. int
  22. timer_delete (
  23. timer_t timerid)
  24. {
  25. struct timer_node *timer;
  26. int retval = -1;
  27. pthread_mutex_lock (&__timer_mutex);
  28. timer = timer_id2ptr (timerid);
  29. if (! timer_valid (timer))
  30. /* Invalid timer ID or the timer is not in use. */
  31. __set_errno (EINVAL);
  32. else
  33. {
  34. if (timer->armed && timer->thread != NULL)
  35. {
  36. struct thread_node *thread = timer->thread;
  37. assert (thread != NULL);
  38. /* If thread is cancelled while waiting for handler to terminate,
  39. the mutex is unlocked and timer_delete is aborted. */
  40. pthread_cleanup_push (__timer_mutex_cancel_handler, &__timer_mutex);
  41. /* If timer is currently being serviced, wait for it to finish. */
  42. while (thread->current_timer == timer)
  43. pthread_cond_wait (&thread->cond, &__timer_mutex);
  44. pthread_cleanup_pop (0);
  45. }
  46. /* Remove timer from whatever queue it may be on and deallocate it. */
  47. timer->inuse = TIMER_DELETED;
  48. list_unlink_ip (&timer->links);
  49. timer_delref (timer);
  50. retval = 0;
  51. }
  52. pthread_mutex_unlock (&__timer_mutex);
  53. return retval;
  54. }