1  /* Copyright (C) 2002-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <stdlib.h>
      20  #include "pthreadP.h"
      21  #include <atomic.h>
      22  #include <shlib-compat.h>
      23  
      24  
      25  #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_3_2)
      26  int
      27  __pthread_cond_wait_2_0 (pthread_cond_2_0_t *cond, pthread_mutex_t *mutex)
      28  {
      29    if (cond->cond == NULL)
      30      {
      31        pthread_cond_t *newcond;
      32  
      33        newcond = (pthread_cond_t *) calloc (sizeof (pthread_cond_t), 1);
      34        if (newcond == NULL)
      35  	return ENOMEM;
      36  
      37        if (atomic_compare_and_exchange_bool_acq (&cond->cond, newcond, NULL))
      38  	/* Somebody else just initialized the condvar.  */
      39  	free (newcond);
      40      }
      41  
      42    return __pthread_cond_wait (cond->cond, mutex);
      43  }
      44  compat_symbol (libpthread, __pthread_cond_wait_2_0, pthread_cond_wait,
      45  	       GLIBC_2_0);
      46  #endif