1/* Copyright (C) 2002-2021 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 <https://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_signal_2_0 (pthread_cond_2_0_t *cond)
29{
30 if (cond->cond == NULL)
31 {
32 pthread_cond_t *newcond;
33
34 newcond = (pthread_cond_t *) calloc (sizeof (pthread_cond_t), 1);
35 if (newcond == NULL)
36 return ENOMEM;
37
38 if (atomic_compare_and_exchange_bool_acq (&cond->cond, newcond, NULL))
39 /* Somebody else just initialized the condvar. */
40 free (newcond);
41 }
42
43 return __pthread_cond_signal (cond->cond);
44}
45compat_symbol (libpthread, __pthread_cond_signal_2_0, pthread_cond_signal,
46 GLIBC_2_0);
47#endif
48