nptl/pthread_cond_init.c

   1 /* Copyright (C) 2002, 2003, 2004 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <shlib-compat.h>
  21 #include "pthreadP.h"
  22
  23
  24 int
  25 __pthread_cond_init (cond, cond_attr)
  26      pthread_cond_t *cond;
  27      const pthread_condattr_t *cond_attr;
  28 {
  29   /* Note that we don't need the PSHARED information from COND-ATTR.
  30      Conditional variables are always usable in multiple processes.  */
  31   struct pthread_condattr *icond_attr = (struct pthread_condattr *) cond_attr;
  32
  33   cond->__data.__lock = LLL_MUTEX_LOCK_INITIALIZER;
  34   cond->__data.__futex = 0;
  35   cond->__data.__nwaiters = (icond_attr != NULL
  36                              && ((icond_attr->value & (COND_CLOCK_BITS << 1))
  37                                  >> 1));
  38   cond->__data.__total_seq = 0;
  39   cond->__data.__wakeup_seq = 0;
  40   cond->__data.__woken_seq = 0;
  41   cond->__data.__mutex = (icond_attr == NULL || (icond_attr->value & 1) == 0
  42                           ? NULL : (void *) ~0l);
  43   cond->__data.__broadcast_seq = 0;
  44
  45   return 0;
  46 }
  47 versioned_symbol (libpthread, __pthread_cond_init,
  48                   pthread_cond_init, GLIBC_2_3_2);