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db0a052c | 1 | /* Copyright (C) 2002, 2003 Free Software Foundation, Inc. |
76a50749 UD |
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, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include "pthreadP.h" | |
22 | #include <lowlevellock.h> | |
23 | ||
24 | ||
25 | int | |
26 | __pthread_mutex_unlock (mutex) | |
27 | pthread_mutex_t *mutex; | |
28 | { | |
29 | switch (__builtin_expect (mutex->__data.__kind, PTHREAD_MUTEX_TIMED_NP)) | |
30 | { | |
31 | case PTHREAD_MUTEX_RECURSIVE_NP: | |
32 | /* Recursive mutex. */ | |
9a7178d6 | 33 | if (mutex->__data.__owner != THREAD_ID) |
76a50749 UD |
34 | return EPERM; |
35 | ||
36 | if (--mutex->__data.__count != 0) | |
37 | /* We still hold the mutex. */ | |
38 | return 0; | |
76a50749 UD |
39 | break; |
40 | ||
41 | case PTHREAD_MUTEX_ERRORCHECK_NP: | |
42 | /* Error checking mutex. */ | |
9a7178d6 | 43 | if (mutex->__data.__owner != THREAD_ID |
76a50749 UD |
44 | || ! lll_mutex_islocked (mutex->__data.__lock)) |
45 | return EPERM; | |
76a50749 UD |
46 | break; |
47 | ||
48 | default: | |
49 | /* Correct code cannot set any other type. */ | |
50 | case PTHREAD_MUTEX_TIMED_NP: | |
51 | case PTHREAD_MUTEX_ADAPTIVE_NP: | |
52 | /* Normal mutex. Nothing special to do. */ | |
53 | break; | |
54 | } | |
55 | ||
9a7178d6 UD |
56 | /* Always reset the owner field. */ |
57 | mutex->__data.__owner = NULL; | |
58 | ||
76a50749 UD |
59 | /* Unlock. */ |
60 | lll_mutex_unlock (mutex->__data.__lock); | |
61 | ||
62 | return 0; | |
63 | } | |
64 | strong_alias (__pthread_mutex_unlock, pthread_mutex_unlock) | |
db0a052c | 65 | strong_alias (__pthread_mutex_unlock, __pthread_mutex_unlock_internal) |