Update.
[glibc.git] / nptl / pthread_mutex_unlock.c
blob32bc2a4bc185871d75840eb91c69234058c5b928
1 /* Copyright (C) 2002, 2003 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 "pthreadP.h"
22 #include <lowlevellock.h>
25 int
26 internal_function attribute_hidden
27 __pthread_mutex_unlock_usercnt (mutex, decr)
28 pthread_mutex_t *mutex;
29 int decr;
31 switch (__builtin_expect (mutex->__data.__kind, PTHREAD_MUTEX_TIMED_NP))
33 case PTHREAD_MUTEX_RECURSIVE_NP:
34 /* Recursive mutex. */
35 if (mutex->__data.__owner != THREAD_GETMEM (THREAD_SELF, tid))
36 return EPERM;
38 if (--mutex->__data.__count != 0)
39 /* We still hold the mutex. */
40 return 0;
41 break;
43 case PTHREAD_MUTEX_ERRORCHECK_NP:
44 /* Error checking mutex. */
45 if (mutex->__data.__owner != THREAD_GETMEM (THREAD_SELF, tid)
46 || ! lll_mutex_islocked (mutex->__data.__lock))
47 return EPERM;
48 break;
50 default:
51 /* Correct code cannot set any other type. */
52 case PTHREAD_MUTEX_TIMED_NP:
53 case PTHREAD_MUTEX_ADAPTIVE_NP:
54 /* Normal mutex. Nothing special to do. */
55 break;
58 /* Always reset the owner field. */
59 mutex->__data.__owner = 0;
60 if (decr)
61 /* One less user. */
62 --mutex->__data.__nusers;
64 /* Unlock. */
65 lll_mutex_unlock (mutex->__data.__lock);
67 return 0;
71 int
72 __pthread_mutex_unlock (mutex)
73 pthread_mutex_t *mutex;
75 return __pthread_mutex_unlock_usercnt (mutex, 1);
77 strong_alias (__pthread_mutex_unlock, pthread_mutex_unlock)
78 strong_alias (__pthread_mutex_unlock, __pthread_mutex_unlock_internal)