nptl/sem_timedwait.c

   1 /* sem_timedwait -- wait on a semaphore with timeout.
   2    Copyright (C) 2003-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <time.h>
  21 #include "sem_waitcommon.c"
  22
  23 /* This is in a separate file because because sem_timedwait is only provided
  24    if __USE_XOPEN2K is defined.  */
  25 int
  26 sem_timedwait (sem_t *sem, const struct timespec *abstime)
  27 {
  28   if (! valid_nanoseconds (abstime->tv_nsec))
  29     {
  30       __set_errno (EINVAL);
  31       return -1;
  32     }
  33
  34   /* Check sem_wait.c for a more detailed explanation why it is required.  */
  35   __pthread_testcancel ();
  36
  37   if (__new_sem_wait_fast ((struct new_sem *) sem, 0) == 0)
  38     return 0;
  39   else
  40     return __new_sem_wait_slow ((struct new_sem *) sem,
  41                                 CLOCK_REALTIME, abstime);
  42 }