Update.
[glibc.git] / nptl / pthread_mutex_init.c
blob074941daf36f2c2b696622f5d4962ba2997d7ff7
1 /* Copyright (C) 2002, 2003, 2004 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 <assert.h>
21 #include <string.h>
22 #include "pthreadP.h"
25 static const struct pthread_mutexattr default_attr =
27 /* Default is a normal mutex, not shared between processes. */
28 .mutexkind = PTHREAD_MUTEX_NORMAL
32 int
33 __pthread_mutex_init (mutex, mutexattr)
34 pthread_mutex_t *mutex;
35 const pthread_mutexattr_t *mutexattr;
37 const struct pthread_mutexattr *imutexattr;
39 assert (sizeof (pthread_mutex_t) <= __SIZEOF_PTHREAD_MUTEX_T);
41 imutexattr = (const struct pthread_mutexattr *) mutexattr ?: &default_attr;
43 /* Clear the whole variable. */
44 memset (mutex, '\0', __SIZEOF_PTHREAD_MUTEX_T);
46 /* Copy the values from the attribute. */
47 mutex->__data.__kind = imutexattr->mutexkind & ~0x80000000;
49 /* Default values: mutex not used yet. */
50 // mutex->__count = 0; already done by memset
51 // mutex->__owner = 0; already done by memset
52 // mutex->__nusers = 0; already done by memset
53 // mutex->__spins = 0; already done by memset
55 return 0;
57 strong_alias (__pthread_mutex_init, pthread_mutex_init)
58 INTDEF(__pthread_mutex_init)