nptl/pthread_cond_init.c

   1 /* Copyright (C) 2002-2023 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 <shlib-compat.h>
  19 #include "pthreadP.h"
  20 #include <stap-probe.h>
  21 #include <string.h>
  22
  23
  24 /* See __pthread_cond_wait for details.  */
  25 int
  26 __pthread_cond_init (pthread_cond_t *cond, const pthread_condattr_t *cond_attr)
  27 {
  28   ASSERT_TYPE_SIZE (pthread_cond_t, __SIZEOF_PTHREAD_COND_T);
  29
  30   struct pthread_condattr *icond_attr = (struct pthread_condattr *) cond_attr;
  31
  32   memset (cond, 0, sizeof (pthread_cond_t));
  33
  34   /* Update the pretty printers if the internal representation of icond_attr
  35      is changed.  */
  36
  37   /* Iff not equal to ~0l, this is a PTHREAD_PROCESS_PRIVATE condvar.  */
  38   if (icond_attr != NULL && (icond_attr->value & 1) != 0)
  39     cond->__data.__wrefs |= __PTHREAD_COND_SHARED_MASK;
  40   int clockid = (icond_attr != NULL
  41                  ? ((icond_attr->value >> 1) & ((1 << COND_CLOCK_BITS) - 1))
  42                  : CLOCK_REALTIME);
  43   /* If 0, CLOCK_REALTIME is used; CLOCK_MONOTONIC otherwise.  */
  44   if (clockid != CLOCK_REALTIME)
  45     cond->__data.__wrefs |= __PTHREAD_COND_CLOCK_MONOTONIC_MASK;
  46
  47   LIBC_PROBE (cond_init, 2, cond, cond_attr);
  48
  49   return 0;
  50 }
  51 libc_hidden_def (__pthread_cond_init)
  52 versioned_symbol (libc, __pthread_cond_init,
  53                   pthread_cond_init, GLIBC_2_3_2);