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[glibc/history.git] / nptl / old_pthread_cond_signal.c
blob5b67f1153e43d039660a59c983ca6c804da932f0
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.
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.
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.
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. */
20 #include <errno.h>
21 #include <stdlib.h>
22 #include "pthreadP.h"
23 #include <atomic.h>
24 #include <shlib-compat.h>
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;
32 if (cond->cond == NULL)
34 pthread_cond_t *newcond;
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;
45 /* Initialize the condvar. */
46 (void) pthread_cond_init (newcond, NULL);
47 #endif
49 if (atomic_compare_and_exchange_bool_acq (&cond->cond, newcond, NULL))
50 /* Somebody else just initialized the condvar. */
51 free (newcond);
54 return __pthread_cond_signal (cond->cond);
56 compat_symbol (libpthread, __pthread_cond_signal_2_0, pthread_cond_signal,
57 GLIBC_2_0);
58 #endif