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_signal_2_0 (cond)
   30:      pthread_cond_2_0_t *cond;
   31: {
   32:   if (cond->cond == NULL)
   33:     {
   34:       pthread_cond_t *newcond;
   35: 
   36: #if LLL_LOCK_INITIALIZER == 0
   37:       newcond = (pthread_cond_t *) calloc (sizeof (pthread_cond_t), 1);
   38:       if (newcond == NULL)
   39:         return ENOMEM;
   40: #else
   41:       newcond = (pthread_cond_t *) malloc (sizeof (pthread_cond_t));
   42:       if (newcond == NULL)
   43:         return ENOMEM;
   44: 
   45:       /* Initialize the condvar.  */
   46:       (void) pthread_cond_init (newcond, NULL);
   47: #endif
   48: 
   49:       if (atomic_compare_and_exchange_bool_acq (&cond->cond, newcond, NULL))
   50:         /* Somebody else just initialized the condvar.  */
   51:         free (newcond);
   52:     }
   53: 
   54:   return __pthread_cond_signal (cond->cond);
   55: }
   56: compat_symbol (libpthread, __pthread_cond_signal_2_0, pthread_cond_signal,
   57:                GLIBC_2_0);
   58: #endif