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_wait_2_0 (cond, mutex)
   30:      pthread_cond_2_0_t *cond;
   31:      pthread_mutex_t *mutex;
   32: {
   33:   if (cond->cond == NULL)
   34:     {
   35:       pthread_cond_t *newcond;
   36: 
   37: #if LLL_LOCK_INITIALIZER == 0
   38:       newcond = (pthread_cond_t *) calloc (sizeof (pthread_cond_t), 1);
   39:       if (newcond == NULL)
   40:         return ENOMEM;
   41: #else
   42:       newcond = (pthread_cond_t *) malloc (sizeof (pthread_cond_t));
   43:       if (newcond == NULL)
   44:         return ENOMEM;
   45: 
   46:       /* Initialize the condvar.  */
   47:       (void) pthread_cond_init (newcond, NULL);
   48: #endif
   49: 
   50:       if (atomic_compare_and_exchange_bool_acq (&cond->cond, newcond, NULL))
   51:         /* Somebody else just initialized the condvar.  */
   52:         free (newcond);
   53:     }
   54: 
   55:   return __pthread_cond_wait (cond->cond, mutex);
   56: }
   57: compat_symbol (libpthread, __pthread_cond_wait_2_0, pthread_cond_wait,
   58:                GLIBC_2_0);
   59: #endif