nptl/old_pthread_cond_timedwait.c

   1 /* Copyright (C) 2002, 2003, 2007 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 <errno.h>
  21 #include <stdlib.h>
  22 #include "pthreadP.h"
  23 #include <atomic.h>
  24 #include <shlib-compat.h>
  25
  26
  27 #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_3_2)
  28 int
  29 __pthread_cond_timedwait_2_0 (cond, mutex, abstime)
  30      pthread_cond_2_0_t *cond;
  31      pthread_mutex_t *mutex;
  32      const struct timespec *abstime;
  33 {
  34   if (cond->cond == NULL)
  35     {
  36       pthread_cond_t *newcond;
  37
  38 #if LLL_LOCK_INITIALIZER == 0
  39       newcond = (pthread_cond_t *) calloc (sizeof (pthread_cond_t), 1);
  40       if (newcond == NULL)
  41         return ENOMEM;
  42 #else
  43       newcond = (pthread_cond_t *) malloc (sizeof (pthread_cond_t));
  44       if (newcond == NULL)
  45         return ENOMEM;
  46
  47       /* Initialize the condvar.  */
  48       (void) pthread_cond_init (newcond, NULL);
  49 #endif
  50
  51       if (atomic_compare_and_exchange_bool_acq (&cond->cond, newcond, NULL))
  52         /* Somebody else just initialized the condvar.  */
  53         free (newcond);
  54     }
  55
  56   return __pthread_cond_timedwait (cond->cond, mutex, abstime);
  57 }
  58 compat_symbol (libpthread, __pthread_cond_timedwait_2_0,
  59                pthread_cond_timedwait, GLIBC_2_0);
  60 #endif