nptl/pthread_cond_init.c

   1 /* Copyright (C) 2002-2018 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <shlib-compat.h>
  20 #include "pthreadP.h"
  21 #include <stap-probe.h>
  22 #include <string.h>
  23
  24
  25 /* See __pthread_cond_wait for details.  */
  26 int
  27 __pthread_cond_init (pthread_cond_t *cond, const pthread_condattr_t *cond_attr)
  28 {
  29   ASSERT_TYPE_SIZE (pthread_cond_t, __SIZEOF_PTHREAD_COND_T);
  30
  31   struct pthread_condattr *icond_attr = (struct pthread_condattr *) cond_attr;
  32
  33   memset (cond, 0, sizeof (pthread_cond_t));
  34
  35   /* Update the pretty printers if the internal representation of icond_attr
  36      is changed.  */
  37
  38   /* Iff not equal to ~0l, this is a PTHREAD_PROCESS_PRIVATE condvar.  */
  39   if (icond_attr != NULL && (icond_attr->value & 1) != 0)
  40     cond->__data.__wrefs |= __PTHREAD_COND_SHARED_MASK;
  41   int clockid = (icond_attr != NULL
  42                  ? ((icond_attr->value >> 1) & ((1 << COND_CLOCK_BITS) - 1))
  43                  : CLOCK_REALTIME);
  44   /* If 0, CLOCK_REALTIME is used; CLOCK_MONOTONIC otherwise.  */
  45   if (clockid != CLOCK_REALTIME)
  46     cond->__data.__wrefs |= __PTHREAD_COND_CLOCK_MONOTONIC_MASK;
  47
  48   LIBC_PROBE (cond_init, 2, cond, cond_attr);
  49
  50   return 0;
  51 }
  52 versioned_symbol (libpthread, __pthread_cond_init,
  53                   pthread_cond_init, GLIBC_2_3_2);