libpthread/nptl/pthread_cond_init.c

   1 /* Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   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    <http://www.gnu.org/licenses/>.  */
  19
  20 #include "pthreadP.h"
  21
  22
  23 int
  24 attribute_protected
  25 __pthread_cond_init (
  26      pthread_cond_t *cond,
  27      const pthread_condattr_t *cond_attr)
  28 {
  29   struct pthread_condattr *icond_attr = (struct pthread_condattr *) cond_attr;
  30
  31   cond->__data.__lock = LLL_LOCK_INITIALIZER;
  32   cond->__data.__futex = 0;
  33   cond->__data.__nwaiters = (icond_attr != NULL
  34                              ? ((icond_attr->value >> 1)
  35                                 & ((1 << COND_NWAITERS_SHIFT) - 1))
  36                              : CLOCK_REALTIME);
  37   cond->__data.__total_seq = 0;
  38   cond->__data.__wakeup_seq = 0;
  39   cond->__data.__woken_seq = 0;
  40   cond->__data.__mutex = (icond_attr == NULL || (icond_attr->value & 1) == 0
  41                           ? NULL : (void *) ~0l);
  42   cond->__data.__broadcast_seq = 0;
  43
  44   return 0;
  45 }
  46 weak_alias(__pthread_cond_init, pthread_cond_init)