nptl/pthread_condattr_setclock.c

   1 /* Copyright (C) 2003-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   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
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <assert.h>
  19 #include <errno.h>
  20 #include <futex-internal.h>
  21 #include <time.h>
  22 #include <sysdep.h>
  23 #include "pthreadP.h"
  24
  25
  26 int
  27 __pthread_condattr_setclock (pthread_condattr_t *attr, clockid_t clock_id)
  28 {
  29   /* Only a few clocks are allowed.  */
  30   if (clock_id != CLOCK_MONOTONIC && clock_id != CLOCK_REALTIME)
  31     /* If more clocks are allowed some day the storing of the clock ID
  32        in the pthread_cond_t structure needs to be adjusted.  */
  33     return EINVAL;
  34
  35   /* Make sure the value fits in the bits we reserved.  */
  36   assert (clock_id < (1 << COND_CLOCK_BITS));
  37
  38   int *valuep = &((struct pthread_condattr *) attr)->value;
  39
  40   *valuep = ((*valuep & ~(((1 << COND_CLOCK_BITS) - 1) << 1))
  41              | (clock_id << 1));
  42
  43   return 0;
  44 }
  45 versioned_symbol (libc, __pthread_condattr_setclock,
  46                   pthread_condattr_setclock, GLIBC_2_34);
  47
  48 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_34)
  49 compat_symbol (libpthread, __pthread_condattr_setclock,
  50                pthread_condattr_setclock, GLIBC_2_3_3);
  51 #endif