1/* Copyright (C) 2002-2018 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, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <stdlib.h>
21#include "pthreadP.h"
22#include <atomic.h>
23#include <shlib-compat.h>
24
25
26#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_3_2)
27int
28__pthread_cond_wait_2_0 (pthread_cond_2_0_t *cond, pthread_mutex_t *mutex)
29{
30 if (cond->cond == NULL)
31 {
32 pthread_cond_t *newcond;
33
34#if LLL_LOCK_INITIALIZER == 0
35 newcond = (pthread_cond_t *) calloc (sizeof (pthread_cond_t), 1);
36 if (newcond == NULL)
37 return ENOMEM;
38#else
39 newcond = (pthread_cond_t *) malloc (sizeof (pthread_cond_t));
40 if (newcond == NULL)
41 return ENOMEM;
42
43 /* Initialize the condvar. */
44 (void) pthread_cond_init (newcond, NULL);
45#endif
46
47 if (atomic_compare_and_exchange_bool_acq (&cond->cond, newcond, NULL))
48 /* Somebody else just initialized the condvar. */
49 free (newcond);
50 }
51
52 return __pthread_cond_wait (cond->cond, mutex);
53}
54compat_symbol (libpthread, __pthread_cond_wait_2_0, pthread_cond_wait,
55 GLIBC_2_0);
56#endif
57